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 EF: Neutrino Physics |
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Sponsoring Units: DNP JPS Chair: Patrick Decowski, University of California Room: Ritz-Carlton Hotel Plantation 3 |
Wednesday, September 21, 2005 9:00AM - 9:15AM |
EF.00001: Atmospheric neutrinos in SNO Charles Currat High energy muons and neutrinos are produced by the interaction of primary cosmic rays in the Earth's upper atmosphere. SNO is in a unique position amongst world experiments located underground. At the depth of over 6 km water equivalent, it is the deepest underground laboratory currently in operation. SNO can make a number of novel measurements using muons. First, SNO's great depth and uniform overburden makes possible an accurate determination of the muon range spectrum. Second, SNO's depth allows for a measurement of atmospheric neutrinos above the horizon (via the detection of neutrino induced muons) at inclinations as large as $\cos{(\theta_{\rm Zenith})} \simeq 0.4$. Also, muons in SNO can be separated in energy, whether they traverse or stop in the detector. Though SNO is a modest-size Cherenkov detector, its unique niche allows to make important model independent checks of atmospheric neutrino oscillations. We will review SNO's capabilities for measurements of muons and neutrinos of atmospheric origin. Progress on the ongoing analysis, including the projected sensitivity to the atmospheric neutrino oscillation parameters, will be shown. [Preview Abstract] |
Wednesday, September 21, 2005 9:15AM - 9:30AM |
EF.00002: FINeSSE, $\Delta$s measurement through neutrino scattering Teppei Katori FINeSSE, Fine-grained Intense Neutrino Scintillator Scattering Experiment, is an experiment to measure $\Delta$s (nucleon spin component carried by strange quarks). $\Delta$s is measured through neutrino-nucleon Neutral Current Elastic (NCE) scattering. A novel non-segmented liquid scintillator tracking detector can track low energy and large angled protons which is necessary for the extraction of $\Delta$s. A $\Delta$s measurement using neutrino beam is not only clean and robust theoretically, but also yields the smallest experimental error. An overview of the experiment will be discussed. [Preview Abstract] |
Wednesday, September 21, 2005 9:30AM - 9:45AM |
EF.00003: MiniBooNE Status : Cross Section Results Heather Ray MiniBooNE, located at Fermi National Laboratory, is an experiment designed to confirm or refute the LSND neutrino oscillation result. MiniBooNE will look for oscillations of $\nu_{\mu} \rightarrow \nu_{e}$ in a closed-box appearance analysis. The event sample at MiniBooNE is dominated by the four following processes : CCQE (charge current quasi-elastic, 40\%), CC$\pi^+$ (charge current $\pi^+$, 25\%), NCE (neutral current elastic, 16\%), NC$\pi^0$ (neutral current $\pi^0$, 7\%). This talk will focus on the current status of cross section measurements for these four processes. [Preview Abstract] |
Wednesday, September 21, 2005 9:45AM - 10:00AM |
EF.00004: Neutrino Flavor Changing Neutral Currents in Gravitational Collapse and the Early Universe Philip Amanik, George Fuller, Ben Grinstein Flavor changing neutrino interactions are a predicted feature of some extensions of the Standard Model. We assess the impact of these processes in stellar collapse and in the very early universe. We find the stellar collapse environment to be sensitive to neutrino flavor changing scattering on heavy nuclei. In general we find that astrophysical environments may offer a probe of these processes at levels below current experiment bounds. [Preview Abstract] |
Wednesday, September 21, 2005 10:00AM - 10:15AM |
EF.00005: Mini Z$'$ Burst from Relic Supernova Neutrinos and Late Neutrino Masses Ina Sarcevic In models in which neutrino mass is generated by the symmetry breaking at low scales, additional light bosons are generically present. We show that the interaction between diffuse relic supernova neutrinos (RSN) and the cosmic background neutrinos, via exchange of these light scalars, can result in a dramatic change of the SN neutrino flux. Measurement of this effect with current or future experiments can provide a spectacular direct evidence for the low scale models. We demonstrate how the observation of neutrinos from SN1987A constrains the symmetry breaking scale of the above models. We also discuss how current and future experiments may confirm or further constrain the above models, either by detecting the ``accumulative resonance'' that diffuse RSN go through or via a large suppression of the flux of neutrinos from nearby $\stackrel{<}{\sim}$ {\cal O}$ (Mpc) SN bursts. [Preview Abstract] |
Wednesday, September 21, 2005 10:15AM - 10:30AM |
EF.00006: Probing the quantum nature of the neutrino with two-particle interferometry Thomas D. Gutierrez, Nu Xu One of the primary contemporary problems in neutrino physics is determining if the neutrino is its own antiparticle. That is, is the neutrino a Majorana ($\nu=\bar{\nu}$) or Dirac ($\nu\not=\bar{\nu}$) fermion. Currently, the only experimental approach being used to determine the quantum nature of the neutrino is through neutrinoless double beta decay. In this work, two-particle intensity interferometry, a second-order interference effect, is explored as another possible tool to distinguish between massive Dirac and Majorana neutrinos. A simple theoretical framework is discussed as well as some experimental considerations. [Preview Abstract] |
Wednesday, September 21, 2005 10:30AM - 10:45AM |
EF.00007: Sterile Neutrinos and Stellar Collapse Jun Hidaka, George Fuller We investigate the effects of medium-enhanced active-sterile neutrino flavor conversion in the infalling core of a presupernova star. We consider singlet (\lq\lq sterile\rq\rq ) neutrino rest masses in the range $1\,{\rm eV}$ to $10\,{\rm MeV}$ and take these species to have very small vacuum mixing with active neutrinos. These parameters subsume the interesting range for viable sterile neutrino dark matter candidates. We find that some ranges of sterile neutrino mass and mixing can give reductions in core entropy and lepton numbers, leading to significant changes in core collapse nuclear physics, dynamics, and composition and opening a possible new probe of this sector of neutrino physics. [Preview Abstract] |
Wednesday, September 21, 2005 10:45AM - 11:00AM |
EF.00008: Double Gamow Teller Resonance by means of Heavy Ion Reaction Keiji Takahisa, Y. Koreeda, H. Akimune, H. Ejiri, H. Fujimura, M. Fujiwara, M. Greenfield, K. Hara, H. Hasimoto, K. Hatanaka, T. Itahasi, T. Kawabata, K. Kawase, N. Maehara, S. Mordechai, Y. Nagai, K. Nakanishi, S. Ninomiya, T. Shima, M. Tanaka, A. Tomyo, S. Umehara, H. Yoshida, S. Yoshida, S. Yosoi To study double spin-isospin responses in view of the $\beta \beta $0$\nu $ decays, double charge-exchange nuclear reactions have measured at RCNP. We have succeeded to measure the double charge exchange reaction by means of heavy ion reaction. From these experiments, we conclude that the ($^{11}$B,$^{11}$Li) reaction at 70 MeV/nucleon is a good spectroscopic tool. We believe that the reaction can be well applied to the study of pure spin-flip nuclear responses including DGT excitations. [Preview Abstract] |
Wednesday, September 21, 2005 11:00AM - 11:15AM |
EF.00009: Electron Capture Branch of $^{100}$Tc and the Efficiency of a Proposed Mo Neutrino Detector Sky Sjue, Alejandro Garcia, Seth Hoedl, Smarajit Triambak, Erik Swanson, Fabian Naab, Irshad Ahmad, Heikki Penttila, Jussi Huikari, Alejandro Algora We present results from a measurement of the Electron-Capture branch of $^{100}$Tc performed at the IGISOL facility in Jyv\"askyl\"a, Finland. The value of the $^{100}$Tc EC BR determines the $^{100}$Mo neutrino absorption cross section to the ground state of $^{100}$Tc, which determines the efficiency of a proposed real-time $pp$ neutrino detector. [Preview Abstract] |
Wednesday, September 21, 2005 11:15AM - 11:30AM |
EF.00010: Test of Nuclear Wavefunctions for Neutrinoless Double Beta Decay J.P. Schiffer, S.J. Freeman, K.E. Rehm, A.C.C. Villari The possibility of observing neutrinoless double beta decay ({\it 0ndbd}) is of great current interest. {\it If} this process {\it is} observed, the major uncertainty will come from the nuclear matrix elements. For the case of $^{76}Ge$, theoretical predictions vary by over an order of magnitude. We propose the study of nuclear reactions to quantitatively test the relevant wave functions, which may help narrow the range of reasonable predictions. Since the {\it 0ndbd} process involves two correlated neutrons changing into two correlated protons with {\it no} intermediate state, it has some relationship to the well-known BCS pairing correlations in nuclear ground states. The latter are best probed by two-nucleon transfer reactions: e.g. $^{76}Ge(p,t)^{74}Ge$ and $^{74}Ge(^3He,n)^{76}Se$. In addition, the occupancy and the changes in occupancy of the valence orbits can be probed using careful measurements of one-nucleon transfer cross sections and sum rules. {\it This work was supported in part by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. W-31-109-ENG-38.} [Preview Abstract] |
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