Bulletin of the American Physical Society
Annual Meeting of the APS Four Corners Section
Volume 62, Number 17
Friday–Saturday, October 20–21, 2017; Fort Collins, CO
Session E5: Particle and Nuclear Physics III |
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Chair: David Kieda, University of Utah Room: Lory Student Center 386 |
Friday, October 20, 2017 1:20PM - 1:44PM |
E5.00001: Searching for Physics Beyond the Standard Model using Superallowed Beta Decay Invited Speaker: Kyle Leach Tests of the Standard Model through precision measurements of nuclear decay properties have proven to be a valuable tool in experimental subatomic physics. Of these investigations, superallowed Fermi nuclear $\beta$ decay data are among the most important, as they currently provide the most precise determinations of both the vector coupling strength in the weak interaction, $G_V$, and the up-down element of the CKM quark mixing matrix, $V_{ud}$. These studies provide some of the best constraints on the possibility of additional quark generations, as well as limits on exotic currents in the weak interaction. In this talk, I will highlight the tremendous experimental and theoretical progress that has been made in this field - particularly the past 15 years - and provide a picture of where it is headed in the near future. [Preview Abstract] |
Friday, October 20, 2017 1:44PM - 1:56PM |
E5.00002: Repurposing Minos Scintillator Modules For TheE Short Baseline Neutrino Program Far Detector (ICARUS) Cosmic Ray Tagger Christopher Hilgenberg, Robert Wilson, Anne Schukraft, David Warner, Simone Marcocci, Tyler Boone The icarus T600 liquid argon time-projection chamber will be the far detector for the short baseline neutrino program. The detector will operate at shallow depth and therefore be exposed to the full surface flux of cosmic rays, which poses a problematic background to the electron neutrino appearance analysis. A direct way to remove this background is to utilize a detector external to the liquid argon active volume capable of tagging thoroughgoing cosmic muons with high efficiency. Ideally, this cosmic ray tagger (CRT) would provide full geometric coverage of the T600 amounting to \textasciitilde 900 m\textasciicircum 2. This is achieved through adopting a system based on extruded organic scintillator, wavelength-shifting fibers, and silicon photomultipliers. Due to the large area, the CRT is broken into 3 subsystems: the top portion will be new construction, the side coverage will be provided by salvaged minos scintillator modules, and the bottom will be covered by double chooz veto modules. To cope with high rates of cosmic muons, the minos system requires a new optical readout and front-end electronics. Here, I present results from the research and development of this new readout scheme and testing of the salvaged modules. [Preview Abstract] |
Friday, October 20, 2017 1:56PM - 2:08PM |
E5.00003: High-Resolution and -Efficiency Gamma-Ray Detection for the FRIB Decay Station Hannah Grover, Kyle Leach, Connor Natzke As we push our knowledge of nuclear structure to the frontier of the unknown with FRIB, a new high-efficiency, -resolution, and -sensitivity photon-detection device is critical. The FRIB decay station collaboration is working to create a new detector array that meets the needs of the exploratory nature of FRIB by minimizing cost and maximizing efficiency. GEANT4 simulations are being utilized to combine detectors in various configurations to test their feasibility. I will discuss these simulations and how they compare to existing simulations of past-generation decay-spectroscopy equipment. [Preview Abstract] |
Friday, October 20, 2017 2:08PM - 2:20PM |
E5.00004: Development of a Cryoprobe for single Ba atom Extraction and Identification from a liquid 136Xe double beta decay experiment Adam Craycraft, Alec Iverson, David Fairbank, Steve Vecchio, William Fairbank Barium tagging is under development for the planned nEXO experiment to reduce backgrounds for the neutrinoless double beta decay search in Xe$^{136}$. One concept for barium tagging involves dipping into, freezing, and extracting xenon on a cryoprobe from the liquid xenon time projection chamber. The development of the cryoprobe and extraction procedure are underway. A possible procedure for extraction on a probe cooled by high pressure argon gas expanding through a Joule Thompson nozzle has been demonstrated. Solid xenon has been frozen on a cryoprobe and has been transported to a laser spectroscopy region. Results of this investigation and examples of possible procedures for extraction are shown. [Preview Abstract] |
Friday, October 20, 2017 2:20PM - 2:32PM |
E5.00005: Observation of Coherent Elastic Neutrino-Nucleus Scattering Robert Cooper Coherent elastic neutrino-nucleus scattering (CE$\nu$NS) has eluded detection for over 40 years despite having the largest interaction cross-section for low-energy neutrinos. A first CE$\nu$NS measurement is difficult because it requires sensitivity to low-energy nuclear recoils in a potentially high-background environment. Despite this difficulty, CE$\nu$NS provides a valuable tool to study nuclear structure, supernovae, and neutrino oscillations. The COHERENT experiment recently made a first observation of the CE$\nu$NS process at a 6.7-sigma confidence level by deploying a 14.6-kg CsI[Na] scintillating crystal at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory. Beyond a first measurement, COHERENT is deploying a suite of other low-energy-threshold detector technologies to study the CE$\nu$NS process in detail, e.g., the neutron-number-squared dependence of the nuclear target. In this talk, I will discuss the first observation of CE$\nu$NS as well as describe the ongoing and future work by the COHERENT collaboration to study the CE$\nu$NS at the SNS.\\ ~\\ D.~Akimov et al.~(COHERENT Collaboration), Science (03 Aug.~2017). \texttt{arXiv:1708.01294 [nucl-ex]}. [Preview Abstract] |
Friday, October 20, 2017 2:32PM - 2:44PM |
E5.00006: A Novel Method for Estimating Backgrounds Due to Signal Physics in a Neutrino Cross Section Measurement Jackie Schwehr The charged-current single pion (CC1Pi) cross section analysis using data from the near detector of the T2K experiment aims to measure kinematic parameters of final state particles in neutrino induced single pion production. A challenge to this measurement is that several of the backgrounds for this analysis are the result of the same neutrino interaction that creates the signal through misidentification of a final state particle or due to secondary interactions prior to detection. We present a novel method for estimating these signal-originated backgrounds using measurements of the signal itself and we demonstrate the effectiveness of this approach for the CC1pi analysis. [Preview Abstract] |
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