Bulletin of the American Physical Society
2013 Fall Meeting of the APS Division of Nuclear Physics
Volume 58, Number 13
Wednesday–Saturday, October 23–26, 2013; Newport News, Virginia
Session PB: Mini-symposium on Reactor Anti-Neutrinos |
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Chair: Xin Qian, Brookhaven National Laboratory Room: Pearl Ballroom I |
Saturday, October 26, 2013 10:30AM - 11:06AM |
PB.00001: A review on the reactor antineutrino flux and reactor based neutrino experiments Invited Speaker: Wei Wang The pure antineutrino flux from nuclear reactors has unique contributions to neutrino physics. We will first briefly review the past and the current reactor based neutrino experiments with more emphases on the current generation short-baseline reactor experiments Daya Bay, RNEO and Double Chooz. In coming years, while the current generation of short-baseline reactor neutrino experiments provides more accurate measurement of theta13 and reactor antineutrino flux, very short-baseline and medium-baseline reactor neutrino experiments are being carried out and proposed. The VSBL experiments are aimming at shedding light at the so-called reactor anomaly problem and provide pure isotope antineutrino flux measurements. The medium-baseline effort is taking the challenge of determining the neutrino mass hierachy and measuring the solar sector oscillation parameters and atmospheric mass-squared split to \textless 1{\%} level. We will also briefly review the reactor antineutrino flux calculation and its key issues and impact to future experiments. [Preview Abstract] |
Saturday, October 26, 2013 11:06AM - 11:18AM |
PB.00002: Improved Measurements of $\theta_{13}$ and Future Prospects with the Double Chooz Experiment Christopher Grant In the past year, reactor neutrino experiments have measured a surprisingly large value of the last mixing angle, $\theta_{13}$. A large, non-zero $\theta_{13}$ has now opened the possibility for future experiments seeking to determine the neutrino mass hierarchy or the effects of a CP-violating phase in neutrino oscillations. The Double Chooz Experiment has a 10 m$^{3}$ $\nu$-target made of Gd-doped liquid scintillator but has recently expanded the target capability by including inverse beta-decay candidates coming from delayed neutron capture on both H and Gd. Double Chooz is also unique in its ability to obtain clean background measurements with both reactor cores powered down. The addition of a near detector and inclusion of Hydrogen capture analysis will provide increased sensitivity to $\theta_{13}$. In light of these upcoming enhancements to Double Chooz, future prospects for $\theta_{13}$ and implications for new physics will be presented. [Preview Abstract] |
Saturday, October 26, 2013 11:18AM - 11:30AM |
PB.00003: The Daya Bay Rate Plus Shape Analysis Jiajie Ling Measuring $\theta_{13}$ is the gateway to measure the charged-parity (CP) violation in the lepton sector, which may ultimately explain why the Big Bang embraced matter over antimatter. In March 2012, Daya Bay Reactor Neutrino Experiment made the first conclusive measurement of $\theta_{13}$ by observing electron antineutrino interactions rate deficit over a baseline around 2 km. This talk will present the detailed study about the reactor spectrum, detector energy nonlinearity and the fitter for the Daya Bay rate plus shape analysis. [Preview Abstract] |
Saturday, October 26, 2013 11:30AM - 11:42AM |
PB.00004: Search for sterile neutrino oscillations with MiniBoone Rex Tayloe The MiniBooNE experiment, located at Fermilab on the Booster Neutrino Beamline, has searched for $\nu_\mu \rightarrow \nu_e$ and $\overline{\nu}_\mu \rightarrow \overline{\nu}_e$ oscillations in the range $0.1<\Delta m^2<5.0$~ev$^2$ as indicated by results from the LSND experiment. MiniBooNE completed a phase of running in April 2012 after collecting $11.3 \times 10^{20}$ protons-on-target (POT) in $\overline{\nu}_{\mu}$ mode and $6.5 \times 10^{20}$ POT in ${\nu}_{\mu}$ mode. The combination of those data sets shows a $3.8\sigma$ excess over background, consistent with that expected from the LSND result. These results along with other evidence for sterile neutrinos and plans for additional running will be presented. [Preview Abstract] |
Saturday, October 26, 2013 11:42AM - 11:54AM |
PB.00005: Reactor Antineutrino Anomaly with known $\theta_{13}$ Chao Zhang We revisit the reactor antineutrino anomaly using the recent reactor flux independent determination of sizable $\theta_{13}$ by considering the full set of the absolute reactor $\bar{\nu}_e$ flux measurements. When normalized to the predicted flux of Mueller et al. [Phys. Rev. C 83, 054615 (2011)], the new world average, after including results from Palo Verde, Chooz, and Double Chooz, is 0.959 $\pm$ 0.009 (experiment uncertainty) $\pm$ 0.027 (flux systematics). Including the data with kilometer baseline, the new world average is only about 1.4$\sigma$ lower than the unity, weakening the significance of the reactor antineutrino anomaly. The upcoming results from Daya Bay, RENO, and the Double Chooz will provide further information about this issue. [Preview Abstract] |
Saturday, October 26, 2013 11:54AM - 12:06PM |
PB.00006: Search for High Energy Component of Reactor Flux Neill Raper The objective of this analysis is to search for evidence of high energy neutrinos generated in the Daya Bay Nuclear Power Plant. As described in P. Huber Phys. Rev. C 84, 024617 (2011), even an imprecise determination of neutrino flux above 8 MeV can constrain reactor core models. Neutrino candidate events with energies above 8 MeV can be identified through the correlation with reactor power. Extrapolation to zero reactor power can be used to estimate background. We will report progress in the search for high energy neutrinos and discuss plans for future work. [Preview Abstract] |
Saturday, October 26, 2013 12:06PM - 12:18PM |
PB.00007: Cosmic Muon-Induced Radioactive Isotopes Yue Meng Cosmic muon-induced radioactive isotopes in liquid scintillating detectors are backgrounds for the Daya Bay Reactor Neutrino Experiment. Understanding these muon-induced backgrounds is very important for studying the detector response and reducing background uncertainties. This talk will discuss the approach used to identify muon spallation isotopes, and the methods used to determine spallation isotope yields and spectra with the Daya Bay data. [Preview Abstract] |
Saturday, October 26, 2013 12:18PM - 12:30PM |
PB.00008: ABSTRACT WITHDRAWN |
Saturday, October 26, 2013 12:30PM - 12:42PM |
PB.00009: A US short-baseline reactor neutrino experiment H. Pieter Mumm Recent calculations of the predicted antineutrino flux from reactors compared to past measurements at baselines between 10-100 m have revealed an intriguing deficit. This discrepancy, combined with anomalous results from other electron antineutrino disappearance experiments, could be a sign of new physics. Precision measurements of the reactor antineutrino spectrum at very short baselines (order 1-10 m) can be used to probe this anomaly and search for possible oscillations into sterile neutrino species as well as provide valuable data for safeguards purposes and reactor flux predictions. Given proper site optimization, detector design, and background reduction, an experiment mounted at a typical US research reactor can provide 5 sigma discovery potential for the favored oscillation parameter space with 3 years of detector live time. We will discuss the technical challenges and recent progress in mounting such an effort. [Preview Abstract] |
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