Bulletin of the American Physical Society
3rd Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 54, Number 10
Tuesday–Saturday, October 13–17, 2009; Waikoloa, Hawaii
Session EJ: Neutrinos II |
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Chair: Susan Gardner, University of Kentucky Room: Queens 4 |
Friday, October 16, 2009 9:00AM - 9:15AM |
EJ.00001: Recoil order correction of $^{8}$B beta decay for solar neutrino spectrum Toshiyuki Sumikama The solar neutrino spectrum of $^{8}$B has been measured precisely at the Super-Kamiokande and the SNO. For the precise neutrino oscillation parameters, the systematic uncertainty about the $^{8}$B neutrino spectrum without neutrino oscillation need to be reduced. Main uncertainty about the neutrino spectrum is the recoil order correction which includes matrix elements. The weak magnetism and the time component of the axial vector current, which is called the axial charge, are the recoil order correction in the $^{8}$B neutrino spectrum. In the present study, the weak magnetism and the axial charge are determined directly from the beta-decay measurements, which are for the beta-alpha angular correlation term [1] and the recently measured spin-alignment correlation term [2]. I will present the extraction of the recoil order correction and compare it with the previous one [3].\\[4pt] [1] R.D. McKeown et al., Phys. Rev. C 22, 738 (1980).\\[0pt] [2] T. Sumikama et al., Phys. Lett. B 664, 235 (2008)\\[0pt] [3] C.E. Ortiz et al., Phys. Rev. Lett. 85, 2909 (2000), W.T. Winter et al., Phys. Rev. C 73, 025503 (2006). [Preview Abstract] |
Friday, October 16, 2009 9:15AM - 9:30AM |
EJ.00002: Radioactive Source Calibration of the Borexino Solar Neutrino Detector Steven Hardy The Borexino solar neutrino detector is currently performing the first real-time measurement of the sub-MeV solar neutrino spectrum. Recently, several calibration campaigns were performed with alpha, beta, gamma and neutron sources to characterize the detector and reduce the errors as much as possible. This talk will concentrate on the hardware, sources, and performance of the system designed for the precise insertion and location of calibration sources into an environment of extreme radiopurity ($\sim$75 counts per day inside the 100 ton fidicual volume). [Preview Abstract] |
Friday, October 16, 2009 9:30AM - 9:45AM |
EJ.00003: Searching for Neutrino and Antineutrino Disappearance with MiniBooNE William Louis The MiniBooNE experiment at Fermilab is designed to be a definitive test of the LSND evidence for neutrino oscillations. If the LSND evidence is confirmed, then, together with the results from solar, reactor, atmospheric, and accelerator neutrino oscillation experiments, it would imply Physics Beyond the Standard Model, such as sterile neutrinos and CP or CPT violation. After seven years of operation, MiniBooNE has collected over 100K muon-neutrino charged-current quasi-elastic (CCQE) scattering events and over 15K muon-antineutrino charged-current CCQE events. Recent neutrino and antineutrino disappearance results will be presented together with a search for CPT violation, which would appear as a difference between neutrino and antineutrino disappearance. [Preview Abstract] |
Friday, October 16, 2009 9:45AM - 10:00AM |
EJ.00004: MiniBooNE $\bar{\nu}_e$ Appearance Results Zarko Pavlovic The MiniBooNE experiment was designed to test the results from the LSND experiment which saw evidence for $\bar{\nu}_\mu \rightarrow \bar{\nu}_e$ oscillations at $\Delta m^2 \sim 1~eV^2 $. The LSND signal cannot be reconciled with neutrino oscillations observed with solar and atmospheric neutrinos within the framework of three Standard Model neutrinos. Previously MiniBooNE looked for the appearance of electron neutrinos in a $\nu_\mu$ beam but saw no evidence for oscillations. At the same time an unexplained excess of electron-like events below a reconstructed neutrino energy of 475 MeV was observed. Currently MiniBooNE is collecting data using the $\bar{\nu}_\mu$ beam. These data provides a direct check of LSND as well as further insight in low energy excess observed in neutrino mode. The recent results of the anti- neutrino appearance analysis will be presented. [Preview Abstract] |
Friday, October 16, 2009 10:00AM - 10:15AM |
EJ.00005: Measurement of the neutrino mixing angle $\theta _{13} $ with the Double Chooz experiment Igor Ostrovskiy The neutrino mixing angle $\theta_{13} $ is last one which value is still unknown. Measuring the $\theta_{13} $ is important for completing our understanding of three flavor neutrino oscillations. Moreover, leptonic CP violation could only be measured in case the value of $\theta_{13} $ is not zero. The current best limit ($\sin ^2(2\theta_{13} )<$0.17 @ 90CL) belongs to the Chooz experiment conducted over 10 years ago in French Ardennes. Described in this talk, is another experiment, Double Chooz, that is being prepared at the same site. The Double Chooz experiment offers several fundamental improvements and is aiming to surpass the current limit by an order of magnitude ($\sin ^2(2\theta _{13} ) <$ 0.03). Details of the detector design, overview of systematic errors and expected sensitivity, as well as current status of the experiment are presented. [Preview Abstract] |
Friday, October 16, 2009 10:15AM - 10:30AM |
EJ.00006: Study of the Sensitivity of the Daya Bay Reactor Neutrino Experiment to sin$^22\theta_{13}$ Using GLoBES Karsten Heeger, Patrick Huber, Christine Lewis, Michael McFarlane, Wei Wang We study the sensitivity and discovery potential of the Daya Bay reactor neutrino experiment to the yet unknown neutrino mixing angle $\theta_{13}$ using the GLoBES framework and evaluate the sensitivity and discovery reach of the experiment for various running times, detector systematics, and uncertainties in the reactor antineutrino flux. The Daya Bay experiment is a next-generation reactor experiment under construction at the Daya Bay Nuclear Power Plant in China to measure the oscillation of reactor antineutrinos over a baseline of $\sim$2~km. The Daya Bay experiment will utilize eight identical, 20-ton detectors, distributed over three experimental sites to measure sin$^22\theta_{13}$ with a sensitivity of 0.01 at 90\% C.L. The discovery of non-zero sin$^22\theta_{13}$ above 0.01 will be key for guiding future accelerated-based, long-baseline neutrino experiments in the next decade. [Preview Abstract] |
Friday, October 16, 2009 10:30AM - 10:45AM |
EJ.00007: Neutrino Quasi-Elastic Scattering Measured with MINERvA Brian Tice The MINERvA experiment is a precision neutrino experiment designed to improve our understanding of the neutrino-nucleus interation. The experiment uses a fully active scintillation detector to allow full event reconstruction, using 4He, C, Fe, and Pb targets to study the nuclear dependence of the interaction. A test run using about 20\% of the full detector, as well as an Fe target, took place in spring 2009. Results of a preliminary analysis and study of detector performance will be presented. [Preview Abstract] |
Friday, October 16, 2009 10:45AM - 11:00AM |
EJ.00008: ABSTRACT WITHDRAWN |
Friday, October 16, 2009 11:00AM - 11:15AM |
EJ.00009: A phenomenological study of photon production in low energy neutrino nucleon scattering James Jenkins Low energy photon production is an important background to many current and future precision neutrino experiments. I present a phenomenological study of t-channel radiative corrections to neutral current neutrino nucleus scattering. After introducing the relevant processes and phenomenological coupling constants, I will explore the derived energy and angular distributions as well as total cross section predictions along with their estimated uncertainties. This is supplemented throughout with comments on possible experimental signatures and implications. I conclude with a general discussion of the analysis in the context of complimentary methodologies. [Preview Abstract] |
Friday, October 16, 2009 11:15AM - 11:30AM |
EJ.00010: Short Baseline Neutrino Oscillations Geoffrey Mills The status and future of short baseline neutrino oscillation experiments will be discussed. LSND and MiniBooNE both have significant deviations from expected events rates in anti-electron and electron neutrinos respectively. Because both were single detector experiments they were unable to distinguish between a unknown background and an oscillation signal. This paper explores possible future experiments which could determine whether or not the observed event excesses are due to an oscillation phenomena. [Preview Abstract] |
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