Bulletin of the American Physical Society
2021 Fall Meeting of the APS Division of Nuclear Physics
Volume 66, Number 8
Monday–Thursday, October 11–14, 2021; Virtual; Eastern Daylight Time
Session PA: Neutrino Frontiers |
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Chair: Jason Detweiler, University of Washington Room: Ballroom B |
Thursday, October 14, 2021 9:30AM - 10:06AM |
PA.00001: Solar Neutrino Physics With Borexino Invited Speaker: Xuefeng Ding Solar neutrino research is moving into an era where precision measurements provide a unique probe of the structure and composition of the Sun's core. The proton-proton (pp) chain and the carbon-nitrogen-oxygen (CNO) cycle are two nuclear fusion processes by which stars convert hydrogen into helium, releasing energy and electron-neutrinos. The neutrino fluxes from these two processes can be used to directly determine the carbon and nitrogen abundances in the solar core region and test Standard Solar Models. Borexino is a liquid scintillator detector targeted at measuring solar neutrinos. It is hosted by the underground INFN Laboratori Nazionali del Gran Sasso in L'Aquila, Italy. Thanks to the unprecedented radio-purity of its liquid scintillator, Borexino has measured the solar neutrino fluxes from the entire pp-chain with high precision. Last fall, after years of efforts in stabilizing the detector thermal and background profile, Borexino achieved the first observation of CNO neutrinos. In this talk, I will review the development of low background technology and the analysis methods used in Borexino. |
Thursday, October 14, 2021 10:06AM - 10:42AM |
PA.00002: Results from KATRIN - First direct neutrino-mass measurement with sub-eV sensitivity Invited Speaker: John F Wilkerson Determining the absolute neutrino-mass scale of neutrinos is vital to our understanding of fundamental interactions and the origin of particle masses, as well as to cosmology and astrophysics. The Karlsruhe Tritium Neutrino (KATRIN) experiment probes the effective electron anti-neutrino mass (mν) via a high precision kinematics measurement of the tritium beta-decay spectrum close to its endpoint at 18.6 keV. Such direct kinematic measurements are complementary to cosmological based observations and neutrinoless double beta decay searches with the advantage that they are independent of the nature of the neutrino (Majorana or Dirac) and to cosmological model assumptions. KATRIN has recently achieved the first sub-eV sensitivity from a direct neutrino mass experiment with a sensitivity on mν of 0.7 eV/c2 at 90% confidence level (CL). The best fit to the spectral data yields m2ν = (0.26 ± 0.34) eV2/c4, resulting in an upper limit of mν < 0.9 eV/c2 (90 % CL). By combining this result with KATRIN's first neutrino mass campaign, we set an upper limit of mν < 0.8 eV/c2 (90 % CL). |
Thursday, October 14, 2021 10:42AM - 11:18AM |
PA.00003: The Physics and Uncertainties of Reactor Antineutrino Spectra Invited Speaker: Anna Hayes In this talk I present the physics determining reactor antineutrino spectra, including the uncertainties in the spectra. There are two methods commonly used to determine the expected antineutrino spectra, the summation method and the conversion method. The summation method sums up all individual contributions to the aggregate spectra, while the conversion method converts measured aggregate beta electron spectra into antineutrino spectra. Both methods introduce uncertainties. The current status of the expected spectra suggests a need for improved nuclear data, particularly improved cumulative fission yields. |
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