Bulletin of the American Physical Society
2005 2nd Joint Meeting of the Nuclear Physics Divisions of the APS and The Physical Society of Japan
Sunday–Thursday, September 18–22, 2005; Maui, Hawaii
Session KC: Mini-symposium on Neutrino Mixing and CP Violation: Reactors, Accelerators, and Supernovae |
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Sponsoring Units: DNP JPS Chair: Robert McKeown, California Institute of Technology Room: Ritz-Carlton Hotel Salon 2 |
Thursday, September 22, 2005 2:00PM - 2:30PM |
KC.00001: Measuring the Neutrino Matrix Invited Speaker: I will review the next steps for measuring the remaining parameters for the MNS matrix, which we hope will ultimately lead to the first observation of leptonic CP violation. The next obvious experiments are reactor and long-baseline accelerator experiments; these will first go after a measurement of non-zero $\theta_{13}$. Long baseline experiments can exploit matter effects to learn about the mass hierarchy. A possibility which sometimes gets less attention is the potential for gaining information via the observation of supernova neutrinos; I will explore what a Galactic supernova could add to the game. [Preview Abstract] |
Thursday, September 22, 2005 2:30PM - 2:45PM |
KC.00002: Super-Kamiokande atmospheric neutrino results Shigetaka Moriyama We will present results from Super-Kamiokande on atmospheric neutrino analysis. The analysis is based on whole SK-I data and recent SK-II data. All of the data is consistent with two flavor neutrino oscillations. For SK-I data, we analized tau appearance in upward-going neutrino events and found the result is consistent with tau appearance due to muon neutrino and tau neutrino oscillations. An oscillation analysis including $\theta_{12}$ will be reported. For SK-II, two flavor neutrino oscillation analysis has been done. The result is consistent with the SK-I result. [Preview Abstract] |
Thursday, September 22, 2005 2:45PM - 3:00PM |
KC.00003: Measuring $\theta_{13}$ with Reactor Antineutrinos at Daya Bay Karsten M. Heeger Neutrino mass and mixing are amongst the major discoveries of recent years. From the observation of flavor change in solar and atmospheric neutrino experiments to the measurements of neutrino mixing with terrestrial neutrinos, recent experiments have provided compelling evidence for the mixing of massive neutrinos. Present experiments have determined two of the three mixing angles in the neutrino mixing matrix. The coupling of the electron neutrino flavor to the third mass eigenstate is not yet known, and its corresponding mixing angle $\theta_{13}$ is critical for exploring CP violation searches in the lepton sector. This talk will describe the proposal for a precision measurement of $\sin^22\theta_{13}$ with reactor anti-neutrinos at the Daya Bay nuclear power plant. [Preview Abstract] |
Thursday, September 22, 2005 3:00PM - 3:15PM |
KC.00004: Testing of Lorentz and CPT violation with LSND Teppei Katori Lorentz/CPT violation is one of the predicted signals of Planck-scale physics. The recently developed formalism of the Standard-Model Extension (SME) \footnote[1]{V.A. Kosteleck\'{y} and M. Mewes, Phys. Rev. D {\bf 69}, 016005 (2004)} for neutrino oscillation is used to analyze the sidereal time variation of the neutrino event excess observed in the LSND experiment. It is found that several SME parameter combinations that reproduce the LSND signal, including combinations with and without sidereal variations. Using the maximum likelihood method, coupled SME parameter values are extracted and the scale of Lorentz and CPT violation for LSND is determined to be of order $10^{-19}GeV$ for the coupled SME parameters $a_L$ and $E \times c_L$. In addition, predictions for future experiments such as MiniBooNE will be presented. [Preview Abstract] |
Thursday, September 22, 2005 3:15PM - 3:30PM |
KC.00005: Low Energy Neutrinos in Super-Kamiokande: Past Successes, New Results, and Future Plans Michael Smy Electrons in the Super--Kamiokande detector have been analyzed between a total energy of 4.5 and 100 MeV for Super--Kamiokande--I and between 7 and 20 MeV for Super--Kamiokande--II. Final results for Super--Kamiokande--I as well as preliminary results for Super--Kamiokande--II are presented and perspectives for Super--Kamiokande--III discussed. [Preview Abstract] |
Thursday, September 22, 2005 3:30PM - 3:45PM |
KC.00006: KamLAND: Studying Neutrino Oscillation with Reactors Michal Patrick Decowski Since the 1950's physicists have been using nuclear reactors to study the properties of anti-neutrinos. In 1956, one of the first such experiments, at the Savannah River Reactor Plant, proved the existence of anti-neutrinos. The original experiment was located only a few meters away from the reactor core, the source of the anti-neutrinos. In the years since, reactor neutrino experiments have steadily increased their baselines, with the goal to test and ultimately establish neutrino disappearance. That goal was reached in 2002, when KamLAND, a one kiloton liquid scintillator detector, reported the first observation of reactor anti-neutrino disappearance at an effective baseline of $\sim$180\,km. KamLAND uses 53 Japanese commercial power reactors as the source of anti-neutrinos. I will discuss KamLAND and present the results of a recently completed analysis of KamLAND data, showing evidence for spectral distortion. Spectral distortion in the neutrino energy is `smoking gun' evidence for neutrino oscillation. I will show that the KamLAND data further solidifies the case for oscillation as the mechanism for neutrino disappearance and give an outlook on future activities at the experiment. [Preview Abstract] |
Thursday, September 22, 2005 3:45PM - 4:00PM |
KC.00007: Solar Neutrino Measurements from the Sudbury Neutrino Observatory Aksel Hallin The Sudbury Neutrino Observatory (SNO) is a heavy water~Cerenkov detector, designed to measure both the electron and total active neutrino flux coming from the sun. The experiment has three phases, which differ in the technique by which neutrons generated by the neutrino-deuteron neutral-current reactions~are measured. The three phases use deuterium, dissolved chlorine, and immersed Helium-3 proportional counters to detect neutrons.~ Until the end of 2006, we are running the third phase of the experiment.~ I report on the status of the analysis and the experiment. [Preview Abstract] |
Thursday, September 22, 2005 4:00PM - 4:15PM |
KC.00008: MiniBooNE Neutrino Oscillations Search Ion Stancu The MiniBooNE experiment at the Fermi National Accelerator Laboratory has been designed to confirm or dismiss the LSND neutrino oscillations result. The experiment has been taking data since August 2000 and has collected 5.5e+20 protons on target to date. This talk will focus on the current status of the neutrino oscillations search. [Preview Abstract] |
Thursday, September 22, 2005 4:15PM - 4:30PM |
KC.00009: Geoneutrino Detection in KamLAND Itaru Shimizu KamLAND has the sensitivity enough to measure geologically produced antineutrinos. That gives us new tools to investigate the Earth's interior. Earth composition models assumes 16 TW radiogenic power from the decay of 238U and 232Th, approximately half of the total measured heat dissipation rate from the Earth, and that can be directly verified by the detector at the Earth's surface. The measurement of radiogenic contribution is incomplete without precise understanding of neutrino oscillation from decades of neutrino oscillation experiments, including the KamLAND reactor neutrino observation. In this talk, the results from a search for geoneutrinos are shown. [Preview Abstract] |
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