Bulletin of the American Physical Society
APS April Meeting 2021
Volume 66, Number 5
Saturday–Tuesday, April 17–20, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session S11: Neutino Interactions ILive
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Sponsoring Units: DNP Chair: Reina Maruyama, Yale University |
Monday, April 19, 2021 1:30PM - 1:42PM Live |
S11.00001: A Machine Learning Approach to Study the Electron-neutrino Charged-current Interaction On Iodine 127 Peibo An An inclusive measurement of the cross section of the electron-neutrino charged-current interactions on $^{127}I$ will help study the quenching of $g_{A}$, the axial-vector coupling constant, which affects the rate of neutrinoless double beta decays. At the Los Alamos Meson Production Facility (LAMPF), an exclusive measurement was made but with a large statistical error. To make a first measurement of the inclusive cross section with low statistically uncertainty, a 185 kg NaI[Tl] prototype was deployed by the COHERENT collaboration. To reduce the major background, cosmic muons, a convolutional neural network (CNN) classifier and a decision tree classifier were developed. The best performer, tested with simulations, achieved a 95$\%$ classification accuracy assuming nano-second timing resolutions (77$\%$ accuracy otherwise). To address the non-linearity of NaI[Tl] crystals at high energies, calibrations using Michel electrons from stopped muon decays are underway. [Preview Abstract] |
Monday, April 19, 2021 1:42PM - 1:54PM Live |
S11.00002: Studying Neutrino Cross-Sections with FASER and FASERnu John Spencer In collider experiments, very light particles are produced in the far-forward direction with small angle relative to the beam axis. The ForwArd Search ExpeRiment (FASER) is aptly located 480 m downstream from the ATLAS interaction point where background is minimal. The FASERnu emulsion detector, positioned just upstream of FASER, will detect collider-produced neutrinos for the very first time. The average cross sections of neutrinos will be measured in the unexplored energy region 350 GeV - 6 TeV. In addition, the interface detector enables track matching between the FASER spectrometer and the FASERnu emulsion detector, which enables separate cross section measurements for mu neutrinos and antineutrinos. I will present the resolving power of the FASER spectrometer and the sensitivity of FASERnu to measuring neutrino-nucleon charged current (CC) cross sections. [Preview Abstract] |
Monday, April 19, 2021 1:54PM - 2:06PM Live |
S11.00003: $\nu_e - { }^{16}O$ Interactions in Super-Kamiokande With Low Energy Atmospheric Neutrinos Baran Bodur, Kate Scholberg Charged-current scattering of $\nu_e$ below 100 MeV from ${ }^{16}O$ nucleus is not yet measured. This interaction is a $\nu_e$ detection channel for water Cherenkov detectors in case of a supernova burst. Furthermore, in Super-Kamiokande diffuse supernova neutrino background (DSNB) is being searched with the inverse beta decay process and $\nu_e - { }^{16}O$ interactions from atmospheric neutrinos are a background to this search. Finally, atmospheric neutrinos at this energy range will be a background for the future WIMP dark matter searches via coherent elastic neutrino-nucleus scattering, and $\nu_e - { }^{16}O$ interactions are a way to probe the atmospheric $\nu_e$ flux at low energies to better estimate this background. A study for the first observation of this interaction from atmospheric $\nu_e$ with 20 years of Super-Kamiokande data is currently underway, with the goal of measuring atmospheric $\nu_e$ flux weighted cross section below 100 MeV. For this purpose, a custom event generator that can accurately simulate products of $\nu_e - { }^{16}O$ and $\bar{\nu}_e - { }^{16}O$ interactions has been built, and now methods to separate signal from the backgrounds are being studied. In this talk, both the event generator and the status of the analysis will be discussed. [Preview Abstract] |
Monday, April 19, 2021 2:06PM - 2:18PM Live |
S11.00004: Muon-Neutrino Charged-Current Semi-Inclusive Charged Pion Cross-Section Measurement Status in the NOvA Near Detector Paul Rojas The NOvA experiment is a long-baseline neutrino experiment hosted by Fermilab. The intense NuMI neutrino beam, combined with NOvA's Near Detector, provides the opportunity to study neutrino interactions at an unprecedented level. The goal of this analysis is to measure the rate of muon-neutrino charged-current interactions in the NOvA near detector resulting in the production of one muon and at least one charged pion. This talk will present the status of the double differential cross-section measurement of this process in muon kinematics of energy and angle. [Preview Abstract] |
Monday, April 19, 2021 2:18PM - 2:30PM Live |
S11.00005: Latest Results and Status of CEvNS on LAr from the COHERENT Collaboration Benjamin Suh Coherent Elastic Neutrino-Nucleus Scattering(CEvNS) is a neutral-current neutrino interaction first observed by the COHERENT Collaboration in 2017 using a Cesium Iodide scintillating crystal. Measurement of the CEvNS cross-section could lead to new physics including constraints on nonstandard neutrino-quark interactions and on the weak nuclear radius. In addition, development of CEvNS-sensitive technologies is useful for WIMP dark matter searches and sterile neutrino searches. As part of the effort towards precision measurements of the CEvNS cross-section, the collaboration has deployed detectors with a range of target nuclei to the Spallation Neutron Source at Oak Ridge National Laboratory(ORNL). A single-phase liquid argon detector, COH-Ar-10, was deployed to the SNS in Fall 2016 by the COHERENT Collaboration. The 24kg fiducial volume target recently made the first low-N measurement of CEvNS in Spring 2020. The data used to make this measurement encompassed eighteen months of operation between mid-2017 and early 2019, for a total of 6.12GWhr total integrated beam power. Here we detail the recent COH-Ar-10 result, discuss improvements for an ongoing analysis, and expected results. [Preview Abstract] |
Monday, April 19, 2021 2:30PM - 2:42PM Live |
S11.00006: New CEvNS results from the COHERENT CsI[Na] detector Daniel Pershey The coherent elastic neutrino-nucleus scattering (CEvNS) process was first observed in 2017 by the COHERENT collaboration using a low background, 14.6 kg CsI[Na] detector using a stopped pion source at the SNS. We cover COHERENT's ongoing effort to further measure CEvNS on a variety of nuclear targets, emphasizing new results from our CsI[Na] detector. CEvNS is a powerful tool to study nuclear structure, stellar astrophysics, and the nature of the weak force. We also discuss the role of this CsI[Na] data in constraining physics beyond the standard model. In particular, we discuss new constraints on neutrino non-standard interactions and sub-GeV dark matter produced at the SNS. [Preview Abstract] |
Monday, April 19, 2021 2:42PM - 2:54PM Live |
S11.00007: Update on Work on COH-Ar-750 Maximilian Hughes Coherent elastic neutrino-nucleus scattering (CEvNS) has been detected in a 24 kg single-phase liquid argon (LAr) scintillator detector. Further data collection and analysis for a 5$\sigma $ measurement is ongoing. To go to precision measurements of the CEvNS recoil spectrum, which can be used to probe other physics such as non-standard neutrino interactions and nuclear form factors, a tonne-scale detector is required. To obtain an event rate 20 times that of the 24 kg detector with a low threshold, a 750 kg LAr scintillator detector has been designed by the COHERENT collaboration to be deployed at the Spallation Neutron Source at Oak Ridge National Laboratory. The 750 kg detector will be sensitive to inelastic charged-current and neutral-current events and to any light accelerator-produced dark matter. This talk will give an update on current work on the light collection and cryogenics of the detector. [Preview Abstract] |
Monday, April 19, 2021 2:54PM - 3:06PM Live |
S11.00008: Charged-Current Muon Neutrino and neutral pion selection in MicroBooNE using Wire-Cell Giacomo Scanavini For surface detectors studying accelerator neutrinos like MicroBooNE, a Liquid Argon Time Projection Chamber (LArTPC), cosmic-ray rejection is just one of the initial challenges that need to be addressed to achieve high-purity neutrino selection. After cosmic-ray rejection, pattern recognition techniques are developed and implemented to select charged-current (CC) muon and electron neutrino events. LArTPCs allow the identification of unique final state particle topologies and provide the ability to break down these critical channels both as backgrounds for electron neutrino appearance searches and cross-section physics. One among these channels is the neutral pion production which is identified as the primary background source for the study of the MiniBooNE Low Energy Excess (LEE) search in MicroBooNE. In this talk, we describe our background rejection and selection strategies, taking advantage of the Wire-Cell reconstruction paradigm, that allows a CC muon neutrino selection with purity >90% and efficiency ~64%, and identification of neutral pion events. [Preview Abstract] |
Monday, April 19, 2021 3:06PM - 3:18PM Live |
S11.00009: Updates on COHERENT's Neutrino-Induced Neutron Detectors Samuel Hedges Neutrino-nucleus interactions can produce excited states that can de-excite by emitting particles, including neutrons. Neutrino-induced neutrons (NINs) produced in common gamma shielding material, such as lead and iron, can pose a background for coherent elastic neutrino-nucleus scattering experiments. Additionally, NIN production in lead is the primary mechanism for the Helium and Lead Observatory (HALO) to detect supernova neutrinos, and iron-based supernova NIN detectors have been proposed. The COHERENT collaboration has deployed two detectors to study NIN production in lead and iron to the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL). An overview of the detector design, signal predictions, and latest results will be presented. [Preview Abstract] |
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