Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session 4WAA: Astrophysical Neutrinos IInvited Workshop
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Chair: Anna Suliga, University of California, Berkeley; Jason Newby, Oak Ridge National Laboratory Room: Hilton Waikoloa Village Kings 1 |
Monday, November 27, 2023 2:00PM - 2:30PM |
4WAA.00001: Detection of Core-Collapse Supernova Neutrinos Invited Speaker: Kate Scholberg When a massive star collapses at the end of its life, nearly all of |
Monday, November 27, 2023 2:30PM - 3:00PM |
4WAA.00002: Astrophysical Neutrino Decay Invited Speaker: Peter B Denton Neutrino decay modifies neutrino propagation in a unique way; not only is there flavor changing as there is in neutrino oscillations, there is also energy transport from initial to final neutrinos. The most sensitive direct probe of neutrino decay is currently IceCube which can measure the energy and flavor of neutrinos traveling over extragalactic distances. For the first time we calculate the flavor transition probability for the cases of visible and invisible neutrino decay, including the effects of the expansion of the universe, and consider the implications for IceCube. As an example, we demonstrate how neutrino decay addresses a tension in the IceCube data. |
Monday, November 27, 2023 3:00PM - 3:30PM |
4WAA.00003: Impact of binary interactions on the diffuse supernova neutrino background Invited Speaker: Tomoya Kinugawa Binary interactions, especially mass transfer and mergers, can strongly influence the evolution of massive stars and change their final properties and the occurrence of supernovae. Here, we investigate how binary interactions affect predictions of the diffuse flux of neutrinos. By performing stellar population syntheses including prescriptions for binary interactions, we show that the resulting detection rates of the diffuse supernova neutrino background is enhanced by 15%-20% compared to estimates without binary considerations. A source of significant uncertainty arises due to the presently sparse knowledge of the evolution of rapidly rotating carbon-oxygen cores, especially those created as a result of mergers near the white dwarf to core collapse boundary. The enhancement effect may be as small as a few percent if the effects of rotation in postmerger systems are neglected, or as large as 75% if trends are extrapolated. Our estimates serve to highlight that binary effects can be important. |
Monday, November 27, 2023 3:30PM - 4:00PM |
4WAA.00004: High energy diffuse background neutrinos in the Universe: from TeV to EeV Invited Speaker: Aya Ishihara The Universe is filled with neutrinos. These diffuse neutrinos extend their presence far beyond the MeV energy range, encompassing much higher energies. The IceCube neutrino observatory has made groundbreaking discoveries in observing TeV to PeV energy neutrinos. Located at the South Pole, IceCube is a cubic-kilometer-scale deep-ice Cherenkov neutrino detector. Its cosmic neutrino searches span an energy spectrum ranging from below the TeV threshold to the EeV range and beyond. |
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