Results from the search for numubar->nuebar appearance with the upgraded KARMEN2 configuration (since February 1997) are presented and compared to other neutrino oscillation experiments. The implications on the LSND results are discussed. Furthermore, the time spectrum of so-called 'single prong' neutrino induced events shows an anomaly (KARMEN time anomaly).Therefore, a hypothesis of an unknown massive, weakly interacting, unstable particle produced in rare pion decays has been tested leading to a consistent description of the experimental results. The latest status of this time anomaly together with the working hypothesis will be presented and discussed.
Authors:KARMEN Collaboration
Proposed speaker: Thomas E. Jannakos
Contact person:Guido Grexlin
(Forschungszentrum Karlsruhe),
guido@ik1.fzk.de
Sessions: PA-08 Neutrino Physics / PL-08a Neutrino Physics (Accelerator and Reactor Neutrino Experiments)
Supporting papers: The KARMEN limit on anti-vµ -> anti-ve oscillation and its implication for the LSND result T. Jannakos in Nucl. Phys. B :Proc. Sixth Topical Seminar on Neutrino and Astroparticle Physics 1999) Analysis of the KARMEN time anomaly C. Oehler in Nucl. Phys. B :Proc. Sixth Topical Seminar on Neutrino and Astroparticle Physics 1999)
Notes:according to the damands and/or the time I will focus one one topic only
We report the latest results from a measurement of the anti-neutrino flux and spectrum at a distance of about 800~m from the three reactors of the Palo Verde Nuclear Generating Station using a segmented gadolinium-loaded scintillation detector. We find that the anti-neutrino flux agrees with that predicted in the absence of oscillations, and an exclusion plot at 90% CL is obtained. Our results support the conclusion that the atmospheric neutrino oscillations observed by Super-Kamiokande do not involve $\nu_{\rm e}$.
Authors:Palo Verde collaboration
Proposed speaker: Yi-Fang Wang
Contact person:Yi-Fang Wang
(Stanford University),
yfwang@hep.stanford.edu
Sessions: PA-08 Neutrino Physics / PL-08a Neutrino Physics (Accelerator and Reactor Neutrino Experiments)
Supporting papers: F. Boehm et al., submitted to Phys. Rev. Lett., hep-ex/991250. Y.F. Wang et al., submitted to Phys. Rev. D, hep-ex/0002050.
Notes:6/19/00 TY-Once put on the program but the speaker decided not to come to the Conference.
The potential of very long baseline neutrino oscillation experiments to verify and test matter effects and CP-violation is discussed at the level of event rates. The magnitude of the effects, the statistical significance and the sensitivity limits are shown and potential strategies to disentangle matter and CP effects are discussed.
Authors:M. Freund, M. Lindner, S.T. Petcov and A. Romanino
Proposed speaker: M. Lindner
Contact person:Manfred B Lindner
(Technical University Munich),
lindner@physik.tu-muenchen.de
Sessions: PA-08 Neutrino Physics / PL-08a Neutrino Physics (Accelerator and Reactor Neutrino Experiments)
Supporting papers: hep-ph/9912457, hep-ph/9903308 and forthcomming work
Notes:
The possibility to explore the Universe through high energy cosmic neutrinos has attracted much attention during recent years. The ANTARES collaboration aims to deploy a 0.1 km2 undersea neutrino detector. To this end, an intensive R&D programme has been underway since 1996. Recently, a first string connected to the shore has been successfully deployed near Marseilles, France, and down-going muons have been recorded. As a preliminary prototype, this string has given very fruitful insights into several aspects of the project and has shown that the techniques involved in such an installation are mastered. This and other results of the ANTARES project will be reported.
Authors:ANTARES Collaboration
Proposed speaker: Juan Jose HERNANDEZ
Contact person:Juan-Jose Hernandez
(Instituto de Fisica Corpuscular (IFIC)),
Juan.J.Hernandez@ific.uv.es
Sessions: PA-08 Neutrino Physics /
Supporting papers:
Notes:"A Deep Sea Telescope for High Energy Neutrinos", The Antares Collaboration, astro-ph/9907432
Updated results from the appearence search for numu -> nutau and nue -> nutau oscillations in the NOMAD experiment will be presented. NOMAD has measured neutrino interactions in the Wide Band Neutrino Beam at CERN. Results are obtained from the full data sample corresponding to about 1.35 Millions numu charged current interactions in the NOMAD active target. The analysis is based on kinematic criteria applied with the likelihood method. No evidence of oscillation is found. In the two-family oscillation scenario this sets a limit on Delta m**2 < 0.7 eV**2/c**4 for sin2theta**2 = 1 and sin2theta**2 < 4.2*10-4 for large Delta m**2 for nu -> nutau oscillation. If the results are interpreted in the nue -> nutau oscillation hypothesis the corresponding limits are Delta m**2 < 6.0 eV**2/c**4 for sin2theta**2 = 1 and sin2theta**2 < 2.0*10-2 for large Delta m**2.
Authors:NOMAD
Proposed speaker: Chiara Roda
Contact person:Chiara Roda
(INFN ),
chiara.roda@cern.ch
Sessions: PA-08 Neutrino Physics / PL-08a Neutrino Physics (Accelerator and Reactor Neutrino Experiments)
Supporting papers: "Updated Results from the Nutau Apperance search in NOMAD" The NOMAD Collaboration, Submitted to Physics Letters. "Limit on Nue -> Nutau Oscillations from the NOMAD Experiment" The NOMAD Collaboration, Phys. Lett. B 471(2000) 406-410 "A more sensitive search for nu_mu->nu_tau oscillations in NOMAD" The NOMAD Collaboration, CERN-EP/99-32, Phys. Lett. B 453(1999)169
Notes:
A momentum analyzer called DCBA (Drift Chamber Beta-ray Analyzer) has been developet at KEK in order to search for zero-neutrino double beta decay of Nd-150. A module of DCBA comprises a drift chamber, a solenoid magnet and cosmic ray veto-counters. A test apparatus called DCBA-T is under construction at KEK to check the feasibility of technical issues. We will report the present status of DCBA-T and the results of simulation studies in which the separation of 0-nu and 2-nu events are investigated down to 0.05 eV of effective neutrino mass, as well as the background elimination.
Authors:DCBA collaboration
Proposed speaker: Nobuhiro Ishihara
Contact person:Nobuhiro Ishihara
(High Energy Accelerator Research Organization),
nobuhiro.ishihara@kek.jp
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers: N. Ishihara et al., A separation method of 0 nu and 2 nu events in double beta decay experiments with DCBA, Nucl. Instr. and Meth. A 443 (2000) 101-107
Notes:
Expected rates for double beta decay in bilinear R-parity violating SUSY including one-loop corrections are discussed in light of recent atmospheric and solar neutrino data. We show that tree-level calculations for double beta decay within the bilinear model are not reliable in the range of parameters preferred by current solar and atmospheric neutrino problems. If the solar and atmospheric neutrino problems are solved in the bilinear R-parity violating SUSY model then the effective Majorana neutrino is less than $0.01$ eV. The possible observation of double beta decay in the next round of experiments would therefore indicate a different explanation for solar and atmospheric neutrino anomalies. Similarly it would also rule out any other hierarchical neutrino mass scheme.
Authors:M. Hirsch, J. C. Romao and J.W.F. Valle
Proposed speaker: M. Hirsch
Contact person:Martin Hirsch
(Universidad de Valencia),
mahirsch@ific.uv.es
Sessions: PA-08 Neutrino Physics /
Supporting papers: M. Hirsch and J.W.F. Valle, Nucl. Phys. B557 (1999) 60 M. Hirsch, J. C. Romao and J.W.F. Valle, hep-ph/0002264
Notes:
For two flavors, the seesaw matrix can be identified with a two dimensional representation of the Lorentz group. This analogy facilitates the computation of physical neutrino parameters, while giving an intuitive understanding of the results. It is found that the induced mixing angle exhibits resonance behavior. For maximal mixing, we derive a precise relation among the right-handed mixing angle, the Majorana mass ratio, and their phase..
Authors:T.K.KUO, G.H. Wu,S.H. Chiu
Proposed speaker: T.K.KUO
Contact person:T.K. KUO
(Purdue Univ),
tkkuo@physics.purdue.edu
Sessions: PA-08 Neutrino Physics / PL-09 Beyond the Standard Model
Supporting papers: hep-ph/0003066
Notes:
The Milano group is involved in the use of massive bolometers for DBD search of 130Te with a detector of 6.8kg TeO2. The present halflife limit reached is of 1.4x10^23 y for the neutrinoless sector. Our experience with this detector will be used in the realization of the CUORE project: a "1-ton" thermal detector for several particle and astroparticle physics applications. Using, in a different philosophy, microbolometers instead of the massive ones can be extremely useful for other applications: a pilot experiment for direct measurement of nu_e mass from the kurie-plot of 187Re beta decay is now starting in Milano.
Authors:C. Brofferio, A.Alessandrello, C. Bucci, O. Cremonesi, E. Fiorini, A. Giuliani, A. Nucciotti, M. Pavan, A. Peruzzi, G. Pessina, S. Pirro, C. Pobes, E. Previtali, M. Sisti, M. Vanzini, L. Zanotti
Proposed speaker: C. Brofferio
Contact person:CHIARA BROFFERIO
(MILANO UNIVERSITY),
chiara.brofferio@mi.infn.it
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers: Preliminary results on double beta decay of 130Te with an array of twenty cryogenic detectors A.Alessandrello et al., Phys. Lett. B433 (1998) 156-162 The CUORE/CUORICINO Project: preliminary studies C. Brofferio, on behalf of the CUORE Collaboration, Yadernaya Fizika 63,n.7 (2000) 1-5 Bolometric measurements of beta decay spectra of 187Re with crystals of silver perrhenate A. Alessandrello et al., Physics Letters B 457 (1999) 253
Notes:
The NuTeV neutrino experiment (Fermilab experiment 815) has searched for the decays of a proposed 33.9 MeV/c**2 neutral particle produced in pion decays. This particle may be reponsible for a timing anomaly observed in the KARMEN neutrino experiment. NuTeV has also completed a search for neutral heavy lepton ("heavy neutrino") decays. The results of both searches will be presented, as well as a status report on other exotic particle searches at NuTeV.
Authors:Eric D. Zimmerman (For the E815/NuTeV collaboration)
Proposed speaker: Eric D. Zimmerman
Contact person:Eric D Zimmerman
(Columbia University Nevis Labs),
edz@fnal.gov
Sessions: PA-08 Neutrino Physics / PL-08a Neutrino Physics (Accelerator and Reactor Neutrino Experiments)
Supporting papers: J. A. Formaggio et al., "Search for a 33.9 MeV/c**2 neutral particle in pion decay," hep-ex/9912062 To appear as Phys. Rev. Lett. 84, 4043 (2000). A. Vaitaitis et al., "Search for neutral heavy leptons in a high energy neutrino beam," Phys. Rev. Lett. 83, 4943 (1999).
Notes:If the KARMEN collaboration speaks about the anomaly, it would be appropriate to have this talk in the same session. Also, an alternative contact person for this talk is Mike Shaevitz (shaevitz@fnal.gov), the collaboration spokesman.
KamLAND, a 1000ton liquid scintillator detector for anti-neutrinos has entered a final construction period in Kamioka mine, Japan. Main purpose of the experiment is to look for nue-bar oscillation with a sensitivity of delta-m**2 much better than 10**-5 eV**2 using a long base-line reactor anti-neutrinos. The experiment is scheduled to start data taking in the next April. Construction status and the prospects for solar neutrino detection will be presented.
Authors:KamLAND Collaboration
Proposed speaker: Junpei Shirai
Contact person:Junpei Shirai
(Tohoku Univ.),
shirai@awa.tohoku.ac.jp
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers:
Notes:
Annihilations of high-energy neutrinos on the background relic neutrinos, with masses in the range inferred from the Super-Kamiokande results, can explain the puzzle of ultra-high energy cosmic rays.
Authors:Alexander Kusenko
Proposed speaker: Alexander Kusenko
Contact person:Alexander Kusenko
(UCLA),
kusenko@ucla.edu
Sessions: PA-08 Neutrino Physics / PL-17 Particle Physics and Cosmology
Supporting papers: 1) Gelmini and Kusenko, Phys.Rev.Lett.84:1378,2000 2) Gelmini and Kusenko, Phys.Rev.Lett.82:5202,1999
Notes: 5/16/00 TY-Deleted #340, which was duplicate with this.
The Sudbury Neutrino Observatory (SNO) has been designed to study solar neutrinos using 1 kiloton of D2O as both the interaction and detection medium. The D2O gives SNO both charged and neutral current sensitivity, allowing a direct observation of solar neutrino oscillations. SNO now has over six live-months of solar neutrino data, and analysis of both signal and backgrounds has begun. I will present the status of the SNO detector and analyses, including calibrations of the detector response, removal of backgrounds, and evidence for the solar neutrino signal, as well as plans and prospects for SNO's overall physics program.
Authors:Joshua Klein, for the SNO Collaboration
Proposed speaker: Joshua Klein
Contact person:Joshua R Klein
(University of Pennsylvania),
jrk@upenn5.hep.upenn.edu
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers:
Notes:
We present an analysis of the MSW neutrino oscillation solutions of the solar neutrino problem in the framework of two-neutrino mixing in the enlarged parameter space $(\Delta m^2, \tan^2\theta)$ with $\theta \in (0,\frac{\pi}{2})$. Recently, it was pointed out that the allowed region of parameters from a fit to the measured total rates can extend to values $\theta \geq \frac{\pi}{4}$ (the so called ``dark side'') when higher confidence levels are allowed. The purpose of this letter is to reanalize the problem including all the solar neutrino data available, to discuss the dependence on the statistical criteria in the determination of the CL of the ``dark side'' and to extract the corresponding limits on the largest mixing allowed by the data. Our results show that when the Super-Kamiokande data on the zenith angle distribution of events and the spectrum information is included, the regions extend more into the dark side.
Authors:M.C. Gonzalez-Garcia, C. Pena-Garay
Proposed speaker: concha gonzalez-garcia
Contact person:concha gonzalez-garcia
(Universidad de Valencia-CSIC),
concha@flamenco.ific.uv.es
Sessions: PA-08 Neutrino Physics /
Supporting papers: hep-ph/0002186
Notes:
A global analysis of all the available atmospheric neutrino data is presented in terms of neutrino oscillations in the nu_mu -> nu_tau and nu_mu -> nu_s channels, where nu_s denotes a sterile neutrino. We perform our analysis of the contained events data as well as the upward-going neutrino-induced muon fluxes. In addition to the previous data samples of Frejus, Nusex, IMB and Kamioka experiments, we include the full data set of the 52 kton-yr of Super-Kamiokande, the recent 4.6 kton-yr contained events of Soudan2 and the results on upgoing muons from the MACRO and Baksan detectors. From the statistical analysis it emerges that the nu_mu -> nu_tau channel provides the best agreement with the combined data, with a best fit point of sin^2(2 theta) = 0.99 and Delta m^2 = 3.0 * 10^{-3} eV^2. Although somehow disfavoured, the nu_mu -> nu_s channels cannot be ruled out on the basis of the global fit to the full set of observables
Authors:N. Fornengo , M.C. Gonzalez-Garcia, J.W.F. Valle
Proposed speaker: concha gonzalez-garcia
Contact person:concha gonzalez-garcia
(Universidad de Valencia-CSIC),
concha@flamenco.ific.uv.es
Sessions: PA-08 Neutrino Physics /
Supporting papers: hep-ph/0002147
Notes:
We present an analysis of the neutrino oscillation solutions of the solar neutrino problem in the framework of four-neutrino mixing where a sterile neutrino is added to the three standard ones. We perform a fit to the full data set corresponding to the 825-day Super-Kamiokande data sample as well as to Chlorine, GALLEX and SAGE and Kamiokande experiments. In our analysis we use all measured total event rates as well as all Super-Kamiokande data on the zenith angle dependence and the recoil electron energy spectrum. We consider both transitions via the Mikheyev-Smirnov-Wolfenstein (MSW) mechanism as well as oscillations in vacuum (just-so) and find the allowed solutions for different values of the additional mixing angles. This framework permits transitions into active or sterile neutrinos controlled by the additional parameter $\cos^2(\vartheta_{23}) \cos^2(\vartheta_{24})$ . We discuss the maximum allowed values of this additional mixing parameter for the different solutions.
Authors:C. Giunti, M.C. Gonzalez-Garcia, C. Pena-Garay
Proposed speaker: concha gonzalez-garcia
Contact person:concha gonzalez-garcia
(Universidad de Valencia-CSIC),
concha@flamenco.ific.uv.es
Sessions: PA-08 Neutrino Physics /
Supporting papers: hep-ph/0001101
Notes:
We present an updated global analysis of two-flavor MSW solutions to the solar neutrino problem in terms of conversions of nu_e into active or sterile neutrinos. We perform a fit to the full data set corresponding to the 825-day Super-Kamiokande data sample as well as to Chlorine, GALLEX and SAGE experiments. We use all measured total event rates as well as Super-Kamiokande data on the zenith angle dependence, energy spectrum and seasonal variation of the events. For conversions into active neutrinos we find that, although the data on the total event rates favours the Small Mixing Angle (SMA) solution, once the full data set is included both SMA and Large Mixing Angle (LMA) solutions give an equivalent fit to the data. The best-fit points for the combined analysis are Delta m^2=3.6 10^{-5} eV^2 sin^2(2theta)=0.79 with chi^2_min=35.4/30 d.o.f and Delta m^2=5.1~ 10^{-6} eV^2 and sin^2(2theta)=5.5 10^{-3} with chi^2_min=37.4/30 d.o.f. In contrast with the earlier 504-day study of Bahcall-Krastev-Smirnov our results indicate that the LMA solution is not only allowed, but slightly preferred. We also show that seasonal effects, although small, may still reach 8.5 % at the best-fit LMA solution without conflict with the hints of a day-night variation (6% is due to the eccentricity of the Earth's orbit). For conversions into sterile neutrinos only the SMA solution is allowed with best-fit point Delta m^2=5.0 10^{-6} eV^2 and sin^2(2theta)=3. 10^{-3} and chi^2_min=40.2/30 d.o.f. We also consider departures of the Standard Solar Model of Bahcall and Pinsonneault 1998 by allowing arbitrary 8^B and hep fluxes. Best fit is obtained for ^8B/^8B_SSM=0.61 (1.37) and hep/hep_SSM=12 (38) for the SMA (LMA) solution.
Authors:M.C. Gonzalez-Garcia, P.C. de Holanda, C.
Pena-Garay, J.W.F. Valle
Proposed speaker: concha gonzalez-garcia
Contact person:concha gonzalez-garcia
(Universidad de Valencia-CSIC),
concha@flamenco.ific.uv.es
Sessions: PA-08 Neutrino Physics /
Supporting papers: hep-ph/9906469
Notes:
We discuss solar neutrino solutions in the non-abelian flavor symmetry. We have found that the lage mixing angle(LMA) MSW solution is naturally derived in the S(3L)xS(3R) or O(3L)xO(3R) flavor symmetric mass matrix. Radiative corrections are studied by using RGE's of the neutrino mass matrix. It is found that the structure of the mass matrix is stable against radiative corrections. Results in KamLAND and the double beta decay experiments as well as solar neutrino data provide tests of models/
Authors:Morimitsu Tanimoto
Proposed speaker: Morimitsu Tanimoto
Contact person:Morimitsu Tanimoto
(Niigata University),
tanimoto@muse.hep.sc.niigata-u.ac.jp
Sessions: PA-08 Neutrino Physics / PL-09 Beyond the Standard Model
Supporting papers: M. Tanimoto, hep-ph/0001306 M. Tanimoto, T. Watari and T. Yanagida
Notes:
We provide explicit formulae for the noncyclic geometric phases or Pancharatnam phases of neutrino oscillations. Since Pancharatnam phase is a generalization of the Berry phase, our results generalize the previous findings for Berry phase in a recent paper [Phys. Lett. B, 466 (1999) 262]. Unlike the Berry phase, the noncyclic geometric phase offers distinctive advantage in terms of measurement and prediction. In particular, for three-flavor mixing, our explicit formula offers an alternative means of determining the CP-violating phase. Our results can also be extended easily to explore geometric phase associated with neutron-antineutron oscillations.
Authors:Xiang-Bin Wang, L.C. Kwek, Yong Liu and C.H. Oh
Proposed speaker: C.H. Oh
Contact person:Choo-Hiap Oh
(National University of Singapore),
phyohch@nus.edu.sg
Sessions: PA-08 Neutrino Physics /
Supporting papers:
Notes:
Recently, the issue of quantum correlations in the mutual probability of detecting neutrino together with accompanying charged lepton has received a new impetus. We describe this effect considering the cases of a monochromatic neutrino source, wave packet source, and neutrino creation in a localized space-time region. In the latter case, we note that the space-time oscillation amplitude depends on the values of the neutrino masses and becomes rather small for large relative mass differences (mass hierarchy). We obtain the expressions for the oscillation and coherence lengths in various circumstances.
Authors:Yuri Shtanov
Proposed speaker: Yuri Shtanov
Contact person:Yuri V. Shtanov
(Bogolyubov Institute for Theoretical Physics),
shtanov@ap3.bitp.kiev.ua
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers: Yu. Shtanov, "Space-time description of neutrino flavor oscillations," Phys. Rev. D 57, 4418--4428 (1998).
Notes:
We present the updated measurement of the the flux and angular distribution of atmospheric muon neutrinos using the MACRO detector. Three different event topologies are detected in two different energy ranges. High energy neutrinos (E~80 GeV) via the identification of upward throughgoing muons. Lower energy neutrinos (E~ 4 GeV) via the upgoing stopping and partially contained downgoing muons, or via the partially contained upgoing muons. These data support MACRO's previously published results. They favor a neutrino oscillation explanation of the atmospheric neutrino anomaly.
Authors:MACRO Collaboration
Proposed speaker: Ronga
Contact person:Francesco RONGA
(INFN Laboratori Nazionali di Frascati),
Francesco.Ronga@lnf.infn.it
Sessions: PA-08 Neutrino Physics /
Supporting papers: 1) MEASUREMENT OF THE ATMOSPHERIC NEUTRINO INDUCED UPGOING MUON FLUX USING MACRO.Phys.Lett.B434:451-457,1998 e-Print Archive: hep-ex/9807005 2) LOW-ENERGY ATMOSPHERIC MUON NEUTRINOS IN MACRO. To be published on E-Print Archive: hep-ex/0001044
Notes:
This experiment is to study the neutrino electron scattering down to an energy threshold of 300keV and to set a laboratory limit for the magnetic moment of the neutrino lower than one tenth of Bohr nanomagneton. The detector is based on a 1m3 time projection chamber(TPC) filled with CF4 gas at a pressure up to 5 bars, and 10m3 of liquid scintillator acting as anti-Compton detector. The experiment is running. Preliminary results will be presented. A scaled-up version (4x50m3) could be considered for solar neutrino spectroscopy at low energy. could be considered for solar neutrino spectroscopy
Authors: Dy-Holm KOANG (MUNU Collaboration:Grenoble-Neuchatel-Padova-Zurich)
Proposed speaker: Dy-Holm KOANG
Contact person:Dy-Holm KOANG
(Univ Joseph fourrier Grenoble, IN2P3/CNRS),
koang@isn.in2p3.fr
Sessions: PA-08 Neutrino Physics / PL-08a Neutrino Physics (Accelerator and Reactor Neutrino Experiments)
Supporting papers: The MUNU experiment, general description Nucl. Inst. and Meth. A396(1997) 115-129 also http://isnwww.in2p3.fr/munu/munu.html
Notes:
After presenting an overview of the wide-ranging physics capabilities of neutrino telescopes, we will present a preliminary look at analyses of approximately one year's worth of data from the AMANDA neutrino telescope. AMANDA uses large volumes of ultra-transparent South Pole ice to sense the Cherenkov light from neutrino-induced muons and electrons. AMANDA is performing searches for ultrahigh energy (UHE) neutrino emission from AGN, GRB and other cosmological point sources, for diffuse UHE neutrino flux, for WIMP dark matter, and supernovae. The capabilities of a kilometer-scale version of AMANDA will also be presented.
Authors:AMANDA
Proposed speaker: D. F. Cowen
Contact person:Douglas F. Cowen
(University of Pennsylvania),
cowen@higgs.hep.upenn.edu
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers:
Notes:
It is shown that the interesting bi-maximal neutrino mixing scenario first suggested by Barger, Pakvasa, Weiler and Whisnant may be naturally resulted from gauge model of flavor symmetry to explain the observed atmospheric and solar neutrino data.
Authors:Y.L.Wu
Proposed speaker: Yue-Liang Wu
Contact person:Sandip Pakvasa
(Hawaii Univ.),
pakvasa@phys.hawaii.edu
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers:
Notes:
We examine the constraints on the lepton mixing matrix from the present and future experimental data of the neutrino oscillation and lepton number violation processes such as neutrinoless double beta decay. We introduce a diagrammatic representation of the CP violation phases which appear in the lepton number violation processes. Using this representation, we can obtain easily the allowed regions on the leptonic CP violating phases from neutrinoless double beta decay without using any constraints on the mixing angles. If we incorporate the informations of the flavour mixings into this method, we will get more severe constraints on the CP violating phases.
Authors:Koichi Matsuda, Nobuhiro Takeda, Takeshi Fukuyama and Hiroyuki Nishiura
Proposed speaker: K. Matsuda
Contact person:Koichi Matsuda
(Ritsumeikan Univ.),
sph30101@se.ritsumei.ac.jp
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers: hep-ph/0003055
Notes:
We strongly believe that neutrinos are Majorana particles. There are many theore tical arguments to support this statement.In spite of that their character should be found experimentally. For this we usually refer to the neutrinoless double beta decay of nuclei, $(\beta\beta)_{0\nu}$. This decay depends on the Majorana neutrino mass matrix element $M_{ee}$ and up to now has obviously not been observed. The experimental data has only been used to derive an upper bound on $|M_{ee}|$.There are further plans to reach higher sensitivities to $(\beta\beta)_{0\nu}$. The purpose is either to make a positive observation or derive an even more stringent bound on $|M_{ee}|$. We consider both scenarios. First we suppose that $(\beta\beta)_{0\nu}$ is observed. As a consequence neutrinos are Majorana particles and the value $|M_{ee}| \neq 0$ gives additional constraints on the mass spectrum. In the course of study we supply the present and future limit on the effective neutrino mass from tritium $\beta$ decay.Next we consider the situation that no decay is found. We then combine the information on $|M_{ee}|$ with that from neutrino oscillations, tritium $\beta$ decay and find possible mass schemes for Majorana neutrinos and those accepted only with Dirac neutrinos.The result shows that Majorana neutrinos are bound to have very small masses and hierarchical spectra only.
Authors:M.Czakon,J.Gluza,J.Studnik and M.Zralek
Proposed speaker: M.Zralek
Contact person:Marek Zralek
(University of Silesia),
zralek@us.edu.pl
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers: hep-ph/0003161
Notes:
Newly constructed Main Injector accelerator will produce neutrino beams of unprecedented intensities, thus permitting high statistics long baseline oscillation experiment. MINOS is a two-detector experiment designed for precise determination of the oscillation parameters in the region indicated by SuperK experiment. Multiple measurements, combining disappearance and appearance signals will provide an unambigous demostration of the oscillatory character of the underlying phenomenon, as well as the measurements of the oscillation parameters with well controlled systematic errors.
Authors:Adam Para, MINOS
Proposed speaker: Adam Para
Contact person:Adam Para
(Fermilab),
para@fnal.gov
Sessions: PA-08 Neutrino Physics / PL-08a Neutrino Physics (Accelerator and Reactor Neutrino Experiments)
Supporting papers:
Notes:If no MiniBOONE talk is given, and it would be beneficial for the session, can expend the talk to cover MiniBOONE. The title then could be 'Neutrino oscillation experiments at Fermialb'
Following the claimed evidence for atmospheric muon neutrino oscillations in 1998, we have been attempting to discriminate between the possible oscillating partners of the muon neutrino as being either the tau neutrino or a new sterile neutrino. Herein we present new tests. These tests use expected differences due to neutral currents and matter effects to discriminate the possibilities. We find no evidence favoring sterile neutrinos, and reject the hypothesis at about 99% confidence level. On the other hand oscillation between muon and tau neutrinos suffices to explain all the results in hand.
Authors:Super-Kamiokande
Proposed speaker: Toshiyuki Toshito
Contact person:Toshiyuki Toshito
(Tokyo Univ.),
toshi@suketto.icrr.u-tokyo.ac.jp
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers:
Notes:
Several cosmologically distant astrophysical sources may produce high-energy cosmic neutrinos (E \geq 10^6 GeV) of all flavors above the atmospheric neutrino background. We study the effects of vacuum neutrino mixing in three flavor framework on this cosmic neutrino flux. We also consider the effects of possible mixing between the three active neutrinos and the (fourth) sterile neutrino with or without Big-Bang nucleosynthesis constraints and estimate the resulting final high-energy cosmic neutrino flux ratios on earth compatible with currently existing different neutrino oscillation hints in a model independent way.
Authors:H. Athar, M. Jezabek and O. Yasuda
Proposed speaker: Athar
Contact person:Athar Husain
(Tokyo Metropolitan University),
athar@phys.metro-u.ac.jp
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers: 1. Athar Husain, hep-ph/0004083. 2. H. Athar, M. Jezabek and O. Yasuda (to be submitted).
Notes:
We study the effect of neutrino oscillations on the detection of neutrinos, from stellar collapse, by a water Cerenkov detector in a 3 as well as 4 flavour (including a sterile neutrino) framework. Their mass squared differences and mixings are constrained by current solar, atmospheric and laboratory neutrino data. Propagation in the highly dense core results in dramatic signals of mixing. These include a large enhancement of backward-peaked events from increased charged-current scattering off oxygen atoms in the detector. It is also possible to distinguish signals due to three- and four-flavour mixing over a large part of the parameter space.
Authors:Gautam Dutta, D. Indumathi, M. V. N. Murthy and
G. Rajasekaran
Proposed speaker: D. Indumathi
Contact person:D. Indumathi
(The Institute of Mathematical Sciences),
indu@imsc.ernet.in
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers: Phys. Rev. D61 (2000) 013009, hep-ph/9907372
Notes:The paper analyses the three flavour case. The four-flavour analysis will be submitted soon.
MONOLITH (Massive Observatory for Neutrino Oscillation or LImits on THeir existence) is the project of an experiment to study atmospheric neutrino oscillations with a massive magnetized detector equipped with Glass RPC. The physics goals of the experiment are to establish or disprove the evidence of neutrino oscillation, to measure the oscillation parameters and to clarify the nature of the oscillation mechanism. The performance of the detector is described, as well as the results obtained with a 8 tons prototype equipped with 20 m2 of Glass RPC.
Authors:The MONOLITH collaboration
Proposed speaker: C.Gustavino
Contact person:Carlo Gustavino
(INFN),
gustavino@lngs.infn.it
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers:
Notes:
Crystal scintillators offer potential advantages for the pursuit of low-energy (keV-MeV) low-background experiments in astro-particle physics[1,2]. Background from ambient radioactivity in this energy range can be largely suppressed with a special detector design where a 3-D fiducial volume can be defined and realized. An experiment toward 500 kg of CsI(Tl) as both target and detector is being prepared by the TEXONO Collaboration comprising research groups from Taiwan, Mailand China and USA. Various physics topics which can be pursued with this detector technology will be discussed, such as the studies of neutrino-electron scattering and neutrino-nuclei neutral current excitation. The physics motivations, detector merits, prototype performance, background considerations, and the status of the experiment will be reported. Prospects of using crystal scintillators in cold dark matter seaches and low energy solar neutrino detection will also be discussed.
Authors:Wen-Ping Lai and Henry Tsz-king Wong, on behalf of the TEXONO Collaboration
Proposed speaker: Wen-Ping Lai
Contact person:Wen-Ping Lai
(Academia Sinica),
wpl@phys.sinica.edu.tw
Sessions: PA-08 Neutrino Physics / PL-08a Neutrino Physics (Accelerator and Reactor Neutrino Experiments)
Supporting papers: [1]``Prospects of Scintillating Crystal Detector in Low-Energy Low-Background Experiment'',H.T.Wong et al., hep-ex/9910002, to be published in Astropart. Physics (2000). [2]``A CsI(Tl) Scintillating Crystal Detector for the Studies of Low Energy Neutrino Interactions'', TEXONO Collab.,hep-ex/0001001, submitted to Nucl. Instrum. Methods (2000).
Notes:
The Kamiokande experiment(1) demonstrates that neutrinos coming from the cosmic ray air showers change their composition when crossing the earth. Neutrino oscillations are not the only explaination for the Kamiokande results. As is well known in the case of photons, a zero mass object has to be considered more as a wave than as a particle. In this contribution we want to show that a zero mass object with a huge interaction length can generate interference patterns which could not happen if the object had either a small interaction length or a mass, even a very small one. In a recent article(2), the author gave an example of such a behaviour. This was considered by most theorists as irrealistic. Nevertheless, we want to point out that there are other possibilities which overcome those objections. There are interactions which, when induced by exactly zero-mass neutrinos, could generate, by interference, apparent neutrino oscillations without violating any fundamental law.
Authors:Paul Baillon
Proposed speaker: Paul Baillon
Contact person:Paul H Baillon
(CERN),
paul.baillon@cern.ch
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers: (1)Evidence for oscillation of atmospheric neutrinos, The Super-Kamiokande Collaboration, Phys. Rev. Lett. 81 (1998) 1562-1567 (2)Do the Kamiokande results need neutrino oscillations? P. Baillon Phys. lett. B 463 (1999) 330-332
Notes:
A generalization of the well-known Georgi-Jarlskog relation (m_{\mu}/m_{\tau}) = 3(m_s/m_b) to neutrinos is found in the context of SO(10). This new relation is (m_{\nu_{\mu}}/m_{\nu_{\tau}}) = 16(m_c/m_t), which is consistent with present data, assuming the MSW solution to the solar neutrino problem.
Authors:K.S. Babu and S.M. Barr
Proposed speaker: K.S. Babu
Contact person:K.S. Babu
(Oklahoma State University),
babu@osuunx.ucc.okstate.edu
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers: arXiv:hep-ph/0004118
Notes:
I have done four neutrino analysis of atmospheric neutrino data with ansatz U_{e3}=U_{e4}=0, without assuming BBN constraints N_\nu < 4. The results indicate that there is still room for hybrid oscillation \nu_\mu <-> \nu_\tau and \nu_\mu <-> \nu_s (pure \nu_\mu <-> \nu_s is excluded and this is consistent with SK analysis). Combining this result with the solar neutrino analysis by hep-ph/0001101, I predict the signals (CP violation etc.) in long baseline experiments.
Authors:Osamu Yasuda
Proposed speaker: Osamu Yasuda
Contact person:Osamu Yasuda
(Tokyo Metropolitan University),
yasuda@phys.metro-u.ac.jp
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers:
Notes:
If three right-handed neutrinos are added to the Standard Model, then, for the three known generations, there are six quarks and six leptons. It is then natural to assume that the symmetry considerations that have been applied to the quark matrices are also valid for the lepton mass matrices. Under this assumption, the solar and atmospheric neutrino data can be used to determine the individual neutrino masses. Three minima have been found, using the chi^2 fit, and, from these minima, it is determined that the mass of the lightest neutrino is 0.0013 eV, that of the next heavier neutrino is 0.013 eV, while the mass of the heaviest neutrino is 0.034, 0.054 or 0.094 eV.
Authors:Per Osland and Tai Tsun Wu
Proposed speaker: Per Osland
Contact person:Per Osland
(University of Bergen),
Per.Osland@fi.uib.no
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers: CERN-TH/99-285, CERN-TH/99-286
Notes:
The Lehmann-Newton-Wu mass matrix, which was recently applied to neutrinos, yielding the mixing angles in terms of mass values, is further investigated. The analytic results presented earlier (abstract 772) are confirmed numerically for the solar density profile of the Standard Solar Model. The combined analysis of atmospheric- and solar neutrino data favors the MSW solution over the vacuum-oscillation solution. We also study the spectrum distortion reported by the Super-Kamiokande collaboration for solar neutrinos.
Authors:Per Osland and Geir Vigdel
Proposed speaker: Per Osland
Contact person:Per Osland
(University of Bergen),
Per.Osland@fi.uib.no
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers:
Notes:
We present new results from the 5 kty exposure of the Soudan 2 tracking iron calorimeter. Results are available for the ratio of muon to electron neutrino quasi-elastic interactions, and for the high-resolution sample (events with observed proton recoils and high-energy quasi-elastic and inelastic interactions). A neutrino oscillation analysis of the latter data will be presented.
Authors:Soudan 2 Collaboration
Proposed speaker: Earl A. Peterson
Contact person:Earl S Peterson
(University of Minnesota),
eap@mnhep.hep.umn.edu
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers:
Notes:
In this talk, I will review the different mechanism for generating very small neutrino masses in theories with extra dimensions.Both the Arkani-Hamed, Dimopoulos and Dvali type, as well as Randall- Sundrum type scenario will be discussed. We will consider different possibilities in which the gauge group in the brane is the Standard Model or its left right extension. The different profiles of the neutrino masses and mixings in these scenarios, as well as their relevance to current and future neutrion experiments will also be analyzed.
Authors:R.N. Mohapatra, S. Nandi and A. Perez-Lorenzana
Proposed speaker: S. Nandi
Contact person:Satyanarayan Nandi
(Oklahoma State University),
shaown@okstate.edu
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers: Neutrino masses and oscillations in models with large extra dimensions, R.N. Mohapatra, S. Nandi and A. Perez-Lorenzana, hep-ph/9907520.
Notes:
Results of neutrino oscillation experiments have always been presented on the (sin^2 2theta, Delta m^2) parameter space for the case of two-flavor oscillations. We point out, however, that this parameterization misses the half of the parameter space pi/4 < theta <= pi/2 (``the dark side''), which is physically inequivalent to the region 0 <= theta <= pi/4 (``the light side'') in the presence of matter effects. The MSW solutions to the solar neutrino problem can extend to the dark side, especially if we take the conservative attitude to allow higher confidence levels, ignore some of the experimental results in the fits, or relax theoretical predictions. Furthermore even the so-called ``vacuum oscillation'' solution distinguishes the dark and the light sides. We urge experimental collaborations to present their results on the entire parameter space.
Authors:Andre de Gouvea, Alexander Friedland, Hitoshi Murayama
Proposed speaker: Hitoshi Murayama
Contact person:Hitoshi Murayama
(University of California),
murayama@lbl.gov
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers: hep-ph/0002064
Notes:
We present an analysis of atmospheric neutrino data fully-contained, partially-contained, and upward-going muon events from a 71 kton year exposure of the Super-Kamiokande detector. All data are well explained by mu-neutrino-tau-neutrion 2-flavor oscillations. We update the 3 flavor analysis of contained events.
Authors:The Super-Kamiokande Collaboration
Proposed speaker: S. Moriyama
Contact person:Shigetaka Moriyama
(ICRR, U of Tokyo),
moriyama@icrr.u-tokyo.ac.jp
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers:
Notes:
The GNO (Gallium Neutrino Observatory) experiment is taking data since April 1998; it is the successor project of GALLEX (GALLium EXperiment) which measured the integral solar neutrino flux at Earth in the years 1991-1997. The aim of GNO is to continue the measurements at least for one solar cycle , possibly increasing the mass of the exposed target from the actual 30 tons up to 60 tons or more. In this talk results relative to the Apr 1998 -February 2000 data taking will be presented, toghether with the major experimental changements performed in the setup passing from GALLEX to GNO, and future experimental plans of the project.
Authors:GNO collaboration
Proposed speaker: Carla Cattadori
Contact person:Carla Cattadori
(Istituto Nazionale di Fisica Nucleare),
cattadori@mi.infn.it
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers:
Notes:
The interference of charge changing interactions, weaker than the Standard Model $V-A$ interaction and having a different Lorentz structure, with that Standard Model interaction, can, in principle, produce effects near the end point of the Tritium beta decay spectrum which are of a different character from those expected from the purely kinematic effect of neutrino mass expected in the simplest extension of the Standard Model. We show that the existence of more than one mass eigenstate can lead to interference effects at the end point that are stronger than those occuring over the entire spectrum.
Authors:G. J. Stephenson, Jr., T. Goldman and Bruce H.J. McKellar
Proposed speaker: Bruce H.J. McKellar
Contact person:Bruce H J McKellar
(University of Melbourne),
mckellar@physics.unimelb.edu.au
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers:
Notes:
A number of astrophysical observations give strong evidence for the presence of dark matter in the universe. However, none of these observation gives any direct clue towards its nature. Our analysis shows that dark matter exists in the universe as a mixture of baryonic and none-baryonic form, the substantial contribution is comming from none-baryonic nature. The recent evidence of massive neutrinos from superkamiokande results shows that neutrinos can play an important role as candidates for the dark matter.
Authors:Muhammad Ali, Javed Sami, Faisal Akram and Mohammad Saleem
Proposed speaker: Muhammad Ali
Contact person:Muhammad Ali
(Punjab University),
saleem@time.lhr.sdnpk.org
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers:
Notes:
The results of searches for astronomical neutrino sources with the Super-Kamiokande detector are presented. We use the neutrino-induced upward through-going muon data for the first 4 years, which is already the world largest data sample, and look for statistically significant excesses over the atmospheric neutrino background. Neutrino fluxes in the directions of the Sun and the core of the Earth are compared with the estimated flux limits due to the Weakly Interacting Massive Particles (WIMPs) as a function of their masses.
Authors:The Super-Kamiokande Collaboration
Proposed speaker: Atsushi Okada
Contact person:Atsushi Okada
(Institute for Cosmic Ray Research, University of Tokyo),
okada@icrr.u-tokyo.ac.jp
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers: "Measurement of the flux and zenith-angle distribution of upward through-going muons by Super-Kamiokande", The Super-Kamiokande Collaboration, Phys. Rev. Lett. 82 (1999) 2644
Notes:
A number of astrophysical observations give strong evidence for the presence of dark matter in the universe. However, none of these observation gives any direct clue towards its nature. Our analysis shows that dark matter exists in the universe as a mixture of baryonic and none-baryonic form, the substantial contribution coming from none-baryonic nature. The recent evidence of massive neutrinos from Superkamiokande results shows that neutrinos can play an important role as candidates for dark matter.
Authors:Muhammad Ali, Javed Sami, Faisal Akram and Mohammad Saleem
Proposed speaker: Muhammad Ali
Contact person:Muhammad Ali
(Punjab University),
saleem@time.lhr.sdnpk.org
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers:
Notes:
We present an overview of the recent developments in neutrino physics, and then explore the future of this field. We explain why the evidence that the atmospheric neutrinos oscillate is so compelling. After briefly discussing the solar and LSND neutrinos, we describe several viable neutrino-mass scenarios suggested by the existing data. We then ask what one would like to learn about the physics of massive neutrinos, and identify future experiments that can help answer the outstanding questions. These experiments range from searches for neutrinoless double beta decay to long-baseline oscillation experiments with neutrinos from a neutrino factory.
Authors:Boris Kayser
Proposed speaker: Boris Kayser
Contact person:Boris Kayser
(National Science Foundation),
bkayser@nsf.gov
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers: "Neutrino Mass and Oscillation," (with P. Fisher and K. McFarland), Ann. Rev. Nucl. Part. Sci. 49, eds. C. Quigg, V. Luth, and P. Paul (Annual Reviews, Palo Alto, California, 1999) p. 481. "Neutrino Mass," a minireview to be published in the 2000 edition of Review of Particle Physics, by the Particle Data Group. "Constraints from Neutrino Oscillation Experiments on the Effective Majorana Mass in Neutrinoless Double Beta Decay," (with S. Bilenky, C. Giunti, W. Grimus, and S. Petcov), Phys. Lett. B 465, 193 (1999). "Physics at a Neutrino Factory," (with the other members of the Fermilab neutrino factory study group).
Notes:The suggested talk could serve to set the stage for the discussion of neutrino mass and oscillation, or to summarize this discussion.
A large fraction of the neutrino interactions collected in the nuclear emulsion target in 1994-1997, has been analysed. The search for nt appearance in the CERN-SPS nm beam has been performed looking for charged current nt interactions, followed by the t lepton decay into a single charged particle. The analysis procedure and the latest results are presented.
Authors:the CHORUS Collaboration
Proposed speaker: To be defined
Contact person:Piero Zucchelli
(CERN),
Piero.Zucchelli@cern.ch
Sessions: PA-08 Neutrino Physics / PL-08a Neutrino Physics (Accelerator and Reactor Neutrino Experiments)
Supporting papers:
Notes:
We calculate the properties of different type of neutrinos in hot and dense stellar media. In this regard, we compare the properties of Weyl neutrinos with that of Majorana and Dirac type neutrinos in the stellar media with and without the magnetic field. Magnetization effects are considered for specific situations.
Authors:Samina S. Masood
Proposed speaker: Samina S. Masood
Contact person:Samina S. names) Masood
(Quaid-i-Azam University, Islamabad, Pakistan (example: Osaka Univ.) ),
saminamasood@hotmail.com
Sessions: PA-08 Neutrino Physics /
Supporting papers:
Notes:Presently visiting USA on leave of absense from the home institute. So kindly contact me at my present address or by e-mail. (018)
The recent results from the solar neutrino observation in Super-Kamiokande are reported. The data set used here is taken from May 1996 until April 2000. Total live time for the solar neutrino observation will be about 1100 days (under analysis now).
Authors:Super-Kamiokande collaboration
Proposed speaker: Yasuo Takeuchi
Contact person:Yasuo Takeuchi
(ICRR, Univ. of Tokyo),
takeuchi@icrr.u-tokyo.ac.jp
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers:
Notes: (027)
The ISIS accelerator at the Rutherford-Appleton-Laboratory serves as a pulsed neutrino source and generates monoenergetic Nymy (29.8MeV) and timely separated Nye, Nymybar (up to 52.8MeV) from the Pi(+)-decay chain at rest with equal intensities. The induced neutral current reactions 12C(Ny,Ny')12C*(1+1,15.1MeV) and the charged current reaction 12C(Nye,e-)12Ngs are detected with spectroscopic quality in the KARMEN detector. The measured cross sections are functions of the coupling strength parameter rho and the isovector-axial coupling constant beta. Both quantities have been determined in the KARMEN Experiment with beta=0.99+-0.06 and rho=1.02+-0.04 and give a consistent picture in the low energy domain.
Authors:KARMEN
Proposed speaker: Wolfgang Kretschmer
Contact person:Wolfgang Kretschmer
(University of Erlangen-Nuremberg),
kretschmer@physik.uni-erlangen.de
Sessions: PA-08 Neutrino Physics / PL-08a Neutrino Physics (Accelerator and Reactor Neutrino Experiments)
Supporting papers:
Notes: Supported by the BMBF (06 ER 833) (041)
The effect of matter enhanced neutrino oscillations on atmospheric neutrinos is investegated systematically in the framework of the one mass dominant model of three flavors. The resonance conditions of neutrinos crossing the earth are determined by the three parameters, namely, the zenith angle, the mass squared difference of neutrinos divided by neutrino energy, and the mixing angle of the electron neutrinos with tau neutrinos. The values of the triplet parameters are given numerically and the feasibility to determine the mixing angle is discussed.
Authors:Shoichi Midorikawa
Proposed speaker: Shoichi Midorikawa
Contact person:Shoichi Midorikawa
(Aomori Univ.),
midori@aomori-u.ac.jp
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers:
Notes: (110)
We describe an approach to the study of neutrino masses that combines quantum optics techniques with radiation detectors to obtain unprecedented sensitivity. With it the search for Majorana neutrino masses down to about 10 meV will become possible. The experimental technique uses the possibility of individually detecting Ba-ions in the final state of Xe-136 double-beta decay via resonant excitation with a set of lasers aimed at a specific location in a large Time Projection Chamber. The specificity of the atomic levels provides tagging and, together with more traditional event recognition parameters, greatly suppresses radioactive backgrounds.
Authors:EXO Collaboration
Proposed speaker: Peter Rowson
Contact person:Giorgio Gratta
(Stanford University),
gratta@hep.stanford.edu
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers: hep-ex/0002003 Phys Lett vol 480 (2000), in press.
Notes:
Authors:K2K Collaboration
Proposed speaker: MakotoSakuda
Contact person:Makoto Sakuda
(KEK),
makoto.sakuda@kek.jp
Sessions: PA-08 Neutrino Physics / PL-08a Neutrino Physics (Accelerator and Reactor Neutrino Experiments)
Supporting papers:
Notes:6/7/00 TY-No abstracts, was in the program.
Authors:Alessandro Bettini
Proposed speaker: Alenssandro Bettini
Contact person:Alenssandro Bettini
(Laboratori Nazionali del Gran Sasso),
alessandro.bettini@cern.ch
Sessions: PA-08 Neutrino Physics / PL-08a Neutrino Physics (Accelerator and Reactor Neutrino Experiments)
Supporting papers:
Notes:6/7/00 TY-No abstract, but was in the program.
A search for the oscillation of muon type antineutrinos to electron type antineutrinos has been conducted with the Liquid Scintillator Neutrino Detector (LSND) experiment by using muon anitineutrinos from positive muon decays at rest. Electron antineutrinos are detected via the reaction of an antineutrino on a proton producing a positron and a neutron. Both the positron and the 2.2 MeV gamma from neutron capture on a proton are detected. Better neutron identification is obtained by using a much improved reconstruction of the gamma position. Results will be presented using the complete sample of data obtained between 1993 and 1998.
Authors:Richard Imlay
Proposed speaker: Richard Imalay
Contact person:Richard Imlay
(Louisiana State University),
imlay@phzeus.phys.lsu.edu
Sessions: PA-08 Neutrino Physics / PL-08a Neutrino Physics (Accelerator and Reactor Neutrino Experiments)
Supporting papers:
Notes:6/7/00 TY-No abstract, but was in the program. 6/21/00 TY- Contents of the abstract was sent in by Myungkee Sung (sung@phzeus.phys.lsu.edu)
Authors:Ken Peach
Proposed speaker: Ken Peach
Contact person:Ken Peach
(CERN),
k.j.peach@rl.ac.uk
Sessions: PA-08 Neutrino Physics / PL-08a Neutrino Physics (Accelerator and Reactor Neutrino Experiments)
Supporting papers:
Notes:6/7/00 TY-No abstract, but was in the program.
Authors:Marco Pallavicini
Proposed speaker:
Contact person:Marco Pallavicini
(INFN Genova),
pallas@ge.infn.it
Sessions: PA-08 Neutrino Physics /
Supporting papers:
Notes:6/7/00 TY-No abstract, but was in the program.
Authors:Stefan Schoenert
Proposed speaker: Stefan Schoenert
Contact person:Stefan Schoenert
(Max-Planck Institute for Nuclear Physics at Heidelberg),
stephan.schoenert@mpi-hd.mpq.de
Sessions: PA-08 Neutrino Physics / PL-08b Neutrino Physics (Non-Accelerator Neutrino Experiments)
Supporting papers:
Notes:6/7/00 TY-No abstract, but was in the program.
End of abstracts for PA-08 Neutrino Physics