Bulletin of the American Physical Society
APS April Meeting 2016
Volume 61, Number 6
Saturday–Tuesday, April 16–19, 2016; Salt Lake City, Utah
Session K3: Low Energy Neutrino Nuclear InteractionsInvited
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Sponsoring Units: DNP Chair: Reyco Henning, University of North Carolina Room: Ballroom B |
Sunday, April 17, 2016 1:30PM - 2:06PM |
K3.00001: Direct nuclear probes of neutrino mass Invited Speaker: Diana Parno Neutrinos have non-zero mass, as demonstrated by an extensive experimental program in neutrino oscillations. The absolute mass scale of neutrinos, however, remains elusive. In this talk, I will review past and future laboratory-based efforts to measure the neutrino mass directly, with minimal model dependence, through the endpoint kinematics of nuclear beta decays. The KATRIN collaboration expects to begin taking data on tritium within the next year; the Project 8 collaboration has recently demonstrated an important proof-of-principle milestone for a new tritium-based concept; and three collaborations — ECHo, HOLMES, and NuMECS — are making substantial progress toward a competitive holmium-based measurement. I will discuss some of the technical and scientific challenges faced by each approach, and give an update on the current status of the field. [Preview Abstract] |
Sunday, April 17, 2016 2:06PM - 2:42PM |
K3.00002: Update and Initial Results from The COHERENT Experiment Invited Speaker: Matthew Green Taking advantage of technologies which have come to maturity and the availability of a world-class pulsed neutrino source, the COHERENT collaboration seeks to make the first unambiguous measurement of coherent, elastic neutrino-nucleus scattering (CEvNS). Oak Ridge National Laboratory’s Spallation Neutron Source is, as a by-product of the spallation process, an intense, pulsed neutrino source. The high beam power of the SNS results in a high neutrino flux, and the energy spectrum of emitted neutrinos is well-suited for CEvNS detection: coherence is preserved in nearly all scattering events while generating nuclear recoil events above threshold for a number of established detector technologies. Additionally, the pulsed nature and short duty cycle of the SNS beam allow for powerful reduction of backgrounds not associated with the beam. The COHERENT Collaboration is deploying a suite of low threshold detectors (CsI[Na] scintillator, high-purity Ge detector array, 2-phase Xe TPC) at the SNS to detect CEvNS, in a manner that limits systematic uncertainties and observes the N$^2$-dependence on the cross section. \\ The current status of the efforts of the collaboration’s efforts will be discussed and longer-term physics goals of the collaboration will be addressed, including searches for non-standard neutrino interactions and a measurement of the Weak mixing angle. Assessments of the backgrounds present in the detector locations will be discussed, including new measurements of neutrino-induced neutron production in candidate shielding materials. Preliminary measurements will be presented from existing deployments, as will implementation plans for upcoming detector systems. [Preview Abstract] |
Sunday, April 17, 2016 2:42PM - 3:18PM |
K3.00003: Solar Neutrinos, Past, Present, Future Invited Speaker: Frank Calaprice I present a brief discussion of the neutrinos emitted in the Sun, based on Bethe’s theory of energy production in stars, and summarize the first experiments that were done to observe solar neutrinos. The focus of my talk will be on the liquid scintillator method that was developed for Borexino. I discuss the methods developed to achieve the low backgrounds needed for direct detection of low energy neutrinos, and summarize the measurements of the four neutrinos emitted in the proton-proton fusion chain, including the recent measurement of “pp” neutrinos from the primary fusion reaction that powers the Sun. I conclude with a discussion of the prospects for measuring CNO neutrinos. [Preview Abstract] |
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