Bulletin of the American Physical Society
88th Annual Meeting of the Southeastern Section of the APS
Volume 66, Number 16
Thursday–Saturday, November 18–20, 2021; University Center Club, Florida State University, Tallahassee, Florida
Session M03: Neutrino Physics II |
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Chair: Jorge Piekarewicz, Florida State University Room: Stadium |
Friday, November 19, 2021 2:00PM - 2:30PM |
M03.00001: The Status of Present Neutrino-less Double Beta Decay Experiments and Proposed Next Generation Invited Speaker: Frank Avignone The only practical way to determine if neutrinos are their own antiparticles is with neutrino-less double beta decay experiments. This process would violate the conservation of lepton number, thus far not observed, while a measurement of its rate would, when combined with neutrino-oscillation data, would determine the mass of neutrino mass eigenstates. Therefore, a direct observation and measurement of the half life would have great impact on nuclear physics, particle physics, astrophysics and cosmology. In this talk, I will discuss the recent major experiments and their results, as well as the proposed next generation projects. [Preview Abstract] |
Friday, November 19, 2021 2:30PM - 3:00PM |
M03.00002: COHERENT collaboration general talk Invited Speaker: Igor Bernardi Neutrinos are light neutral-charged particles that can only be probed via weak interactions. After almost 100 years of their first prediction, much is yet to be known about them, and learning more about neutrinos may answer broad questions in physics that are still open. Coherent elastic neutrino-nucleus scattering (CEvNS) is the process in which an atomic nucleus recoils from a scattered neutrino. Experimental observation of CEvNS took more than 40 years since it was predicted theoretically, and was first observed by COHERENT collaboration with a CsI[Na] detector in 2017. In 2020 COHERENT also first observed CEvNS on argon. COHERENT collaboration has many subsystems (active and planned) with the goal of detecting and understanding neutrinos. This is a general COHERENT talk in which results, as well as planned subsystems, will be discussed. [Preview Abstract] |
Friday, November 19, 2021 3:00PM - 3:30PM |
M03.00003: Neutrino-Nucleus Scattering from analog Electromagnetic Reactions Invited Speaker: Udo Friman-Gayer Despite their weakly-interacting character, neutrinos have a significant impact on the most spectacular astronomical events known, such as supernovae and neutron-star mergers. Furthermore, they carry information about these events to Earth almost unaffected by the interstellar medium. Unfortunately, the low interaction probability with matter implies that their detection is challenging. For the same reason, basic properties of neutrinos such as their mass or the character of their antiparticles remain unknown, and many large-scale experiments are dedicated to their study on a worldwide scale. Since the direct detection of neutrinos relies on scattering and absorption processes, a precise knowledge of neutrino-nuclear cross sections is crucial to understand the nature of the neutrinos themselves as well as of the astrophysical processes generating them. This contribution will give a brief overview of the efforts to detect neutrinos directly, with a focus on experiments at the Triangle Universities Nuclear Laboratory (TUNL). After that, it will be shown how the close relationship between the weak and the electromagnetic (EM) interaction can be used to infer neutrino-nucleus scattering cross sections from photonuclear reactions. As an example, a nuclear resonance fluorescence experiment on $^{40}$Ar -- a promising isotope for next-generation neutrino detectors -- will be discussed. At TUNL's High-Intensity Gamma-Ray source, the magnetic dipole strength of this nucleus was studied. This strength is closely related to the so-called Gamow-Teller strength that makes up a significant part of the neutrino-nucleus cross section at energies relevant for astrophysics. It will be demonstrated that uncertainties in this type of measurement are dominated by systematic effects in the data and by the nuclear theory required to connect the EM and weak sectors. [Preview Abstract] |
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