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 KA: Fundamental Physics at Next Generation Neutron Sources |
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Chair: Daniel Salvat, Indiana University Room: Ballroom B |
Wednesday, October 13, 2021 11:30AM - 12:06PM |
KA.00001: Neutrino Physics at the ORNL Spallation Neutron Source Invited Speaker: Matthew P Green In recent years, Oak Ridge National Laboratory's Spallation Neutron Source (SNS) has proven itself as one of the world's premier stopped pion neutrino sources, due to the high neutrino flux, well-understood neutrino spectrum, and a timing structure that enables significant reductions of steady-state backgrounds. The COHERENT Collaboration has made effective use of the SNS to make the world's first measurements of Coherent Elastic Neutrino Nucleus Scattering (CEvNS), and constrain beyond-the-standard-model physics such as Non-Standard Neutrino Interactions (NSIs) and accelerator-produced dark matter. As plans for construction of a Second Target Station (STS) and an associated beam power upgrade develop, opportunities arise for enabling future fundamental physics searches at this unique facility. We will discuss performing neutrino physics measurements at the SNS, including recent results and developments by the COHERENT Collaboration, and future possibilities associated with the STS. |
Wednesday, October 13, 2021 12:06PM - 12:42PM |
KA.00002: Free Neutron Oscillations Searches Invited Speaker: Valentina Santoro The European Spallation Source ESS, presently under construction, in Lund, Sweden, is a multi-disciplinary international laboratory. It will operate the world's most powerful pulsed neutron source. Taking advantage of the unique potential of the ESS, the NNBAR collaboration proposed a two-stage program of experiments to perform high precision searches for neutron conversion in a range of baryon number violation (BNV) channels culminating in an ultimate sensitivity increase for neutron → antineutron oscillations of three orders of magnitude over the previously attained limit obtained at the Institut Laue-Langevin ILL . The first stage of this program HIBEAM (High Intensity Baryon Extraction and Measurement) will employ the ESS fundamental physics beamline. This stage focuses principally on searches for neutron conversion to sterile neutrons n' that would belong to a ``dark" sector. |
Wednesday, October 13, 2021 12:42PM - 1:18PM |
KA.00003: Neutrino Studies at the High Flux Isotope Reactor – Results and Perspectives Invited Speaker: Alfredo Galindo-Uribarri I will present the latest scientific results from the PROSPECT (Precision Oscillation and Spectrum) experiment; describe plans for the PROSPECT-II detector upgrade; and describe the impact of next-generation, reactor-based neutrino sources in enabling fundamental and applied reactor neutrino science. The PROSPECT collaboration, which includes both universities and U.S. National Laboratories, has been successful in making world-leading short-baseline measurements detecting antineutrinos from the High Flux Isotope Reactor (HFIR). HFIR is an 85 MW HEU research reactor located at ORNL. PROSPECT is a ton scale liquid scintillator detector with minimum overburden that features efficient optical segmentation and a 6Li-doped liquid scintillator with good light yield and pulse-shape discrimination properties enabling excellent energy reconstruction and background rejection. The PROSPECT physics program focuses on the search for eV-scale sterile neutrino oscillation at short baselines and a precise measurement of the U-235 reactor antineutrino energy spectrum. The first phase of this experiment has established the strongest limits on the existence of eV-scale sterile neutrinos in the high mass range. Furthermore, HFIR provides a unique compact neutrino source where over 99% of the antineutrino flux comes from the decay of U-235 fission products, enabling an exclusive measurement of the U-235 antineutrino energy spectrum. The initial results have motivated an expanded scientific and technical scope, including joint data analyses with other neutrino experiments, applications of Machine Learning to neutrino data, optimized data analysis with single ended event reconstruction, boosted dark matter searches, and potential reactor monitoring applications. Furthermore, they have enabled the development of more robust detectors with improved scintillators, new concepts for the energy scale determination, and detailed background characterization for future reactor experiments. |
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