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 JB: Mini-Symposium: Neutrinos and Nuclei VI: Neutrino Scattering II |
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Chair: Wouter Dekens, INT Room: Statler |
Wednesday, October 13, 2021 9:30AM - 9:42AM |
JB.00001: Exploring the Functional Dependence of the Nucleon Axial Form Factor Kevin J Quirion, Emilie Passemar, Alexander Friedland, Sergi Gonzalez-Solis We explore the implications of recent nucleon axial form factor lattice calculations for neutrino scattering experiments. |
Wednesday, October 13, 2021 9:42AM - 9:54AM |
JB.00002: Neutral and Charged Current Neutrino Cross Sections for Liquid Argon Detectors Darcy A Newmark, Anna Hayes, Xiaobao Wang, James L Friar, Henry G Yeomans We present the neutrino neutral current cross sections on 40Ar at neutrino energies expected for supernova events. Several high energy gamma rays are emitted which offer a promising signal for studying the neutral current. In addition, we examine the charged current cross sections using large shell model calculations that are constrained by B(GT) and B(F) measurements but include operators to all orders in q2. |
Wednesday, October 13, 2021 9:54AM - 10:06AM |
JB.00003: Total Neutron Cross Section Measurement with a 3D Projection Scintillator Tracker for Long-baseline Neutrino Experiments: Rachel Pellegrino The long-baseline neutrino oscillation experiments depend on detailed models of neutrino interactions on nuclei. However, these models constitute an important source of systematic uncertainty partly due to the missing information of the final state neutrons in the detectors to date. As such, neutron information is desired in the near detectors of upcoming long-baseline neutrino experiments. Here, we are proposing a three-dimensional projection scintillator tracker to be used as a near detector component in the next generation long-baseline neutrino experiments such as T2K upgrade and DUNE. Due to the good timing resolution and fine granularity, this technology is capable of measuring neutron kinetic energy from neutrino interactions and can provide valuable data for refining neutrino interaction models and better reconstruct the neutrino energy. Neutron beam data has been taken in Los Alamos National Lab (LANL) in both 2019 and 2020 with neutron energy ranging from 0 to 800 MeV using two of such prototype detectors. In order to demonstrate the capability of the neutron detection, a total neutron-scintillator cross section is measured with one of the prototypes and compared to external measurements. In this presentation, the details of the cross section measurement and the systematic uncertainty handling will be presented. |
Wednesday, October 13, 2021 10:06AM - 10:18AM |
JB.00004: Electrons For Neutrinos: New Experiments at Jefferson Lab Stuart Fegan The Electrons for Neutrinos project (e4nu) at the Thomas Jefferson National Accelerator Facility (JLab) uses wide phase space exclusive electron scattering data from past and future experiments on nuclear targets with the CLAS and CLAS12 detector systems to obtain a comprehensive understanding of the interaction of leptons with matter. Data from JLab provides us with the means to constrain the available theoretical tools that are crucial in modeling the neutrino-nucleus interaction, and thus play a key role in the precise determination of the physics observables from neutrino-nucleus interactions measured at current and future neutrino experimental facilities, including MicroBooNE, MINERvA, DUNE and T2K. |
Wednesday, October 13, 2021 10:18AM - 10:30AM |
JB.00005: Electrons for Neutrinos: Analysis of 1p1pi Channel Alicia Mand, Mariana Khachatryan, Afroditi Papadopoulou, Adi Ashkenazi, Florian Hauenstein, Anjali Nambrath, Lawrence B Weinstein, Or Hen, Lucas A Tracy, Stuart Fegan Neutrino oscillation is being studied in laboratories around the world. This oscillation is measured as a function of propagation distance divided by energy. However, the incident neutrino energy (E) must be reconstructed from particles detected following neutrino-nucleus interactions. We exploited the similarities between electron-nucleus and neutrino-nucleus interactions to test this energy reconstruction. We used electron-nucleus scattering data with known beam energies and the large-acceptance CLAS6 detector at the Thomas Jefferson National Accelerator Facility. We used 1.1, 2.2, and 4.4 GeV electrons incident on helium, carbon, and iron targets. Previous analyses of this data looked at the quasi-elastic dominated 1p0pi channel. This presentation will discuss the resonance dominated 1p1pi channel. We will present pi+, pi-, and pi0 results and compare them to GENIE calculations. This data will guide improvements in event generators which are important in understanding neutrino-nucleus interactions currently being studied at facilities such as MicroBooNE, MINERvA, DUNE, and T2K. |
Wednesday, October 13, 2021 10:30AM - 10:42AM |
JB.00006: The COHERENT Tonne-scale LAr CEvNS Detector and neutron backgrounds Maximilian N Hughes Coherent elastic neutrino-nucleus scattering (CEvNS) has been detected in a 24 kg single-phase liquid argon (LAr) scintillator detector. To obtain an event rate 20 times that of the 24 kg detector with a low threshold, the 750 kg LAr scintillator detector COH-Ar-750 has been designed by the COHERENT collaboration to be deployed at the Spallation Neutron Source at Oak Ridge National Laboratory. Work on the cryogenics system and light collection is ongoing. The 750 kg detector will be sensitive to non-standard neutrino interactions, nuclear form factors, inelastic charged-current and neutral-current events, and to light accelerator-produced dark matter. A large source of background for these measurements are beam related neutrons (BRNs). To measure BRNs, set of four 5L EJ301 liquid scintillator detectors on a mobile cart was used to measure timing and energy information at different locations along neutrino alley. The energy and timing results for these measurements will be presented here, along with other updates on the development of COH-Ar-750. |
Wednesday, October 13, 2021 10:42AM - 10:54AM |
JB.00007: Electron neutrino charged current interaction studies on 127I with the COHERENT 185 kg NaI detector Peibo An, Karla R Tellez Giron Flores An inclusive measurement of the cross section of the neutrino charged-current interactions on 127I can probe the quenching of gA, 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 of the flux-averaged cross section was made but with a large statistical error. To make a first measurement of the inclusive cross section with low statistical uncertainty, a 185 kg NaI[Tl] prototype was deployed by the COHERENT collaboration at the Spallation Neutron Source. To reduce the major background, cosmic muons, a convolutional neural network (CNN) classifier and a random forest classifier were developed (the best 2-class model, tested with simulations, achieved a 94% classification accuracy assuming nano-second timing resolutions). To address the non-linearity of NaI[Tl] crystals at high energies, calibrations using Michel electrons from stopped muon decays are underway. Data analysis is ongoing and latest results will be presented. |
Wednesday, October 13, 2021 10:54AM - 11:06AM |
JB.00008: Prospects for measurement of neutrino-argon charged-current interactions with the COHERENT liquid argon detector Erin E Conley A core-collapse supernova burst (SNB) releases 99% of a star's gravitational potential energy via neutrinos over a period of several seconds. These neutrinos have energies in the few to 10s of MeV range. Lack of knowledge of low-energy neutrino cross sections will limit the amount of physics extracted during a future SNB. In particular, the electron neutrino-argon charged- current inelastic interaction (????CC) cross section has never been measured at the SNB neutrino energy range. Furthermore, different cross section calculations are only theoretically motivated and contain significant variations when comparing different models. The COHERENT liquid argon detector (COH-Ar-10) observes neutrinos with energies in the 10s of MeV at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory. COH-Ar-10 provides the opportunity to study the ????CC interaction at the relevant neutrino energy range for SNB neutrinos. To understand and characterize the COH-Ar-10 response to MeV-scale interactions, we first focused on analyzing signals produced by cosmic muons and Michel electrons, the latter having a similar energy distribution to the SNS ???? signal. This talk will detail preliminary studies focused on COH-Ar-10 detector sensitivity to cosmic muons and Michel electrons. |
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