Bulletin of the American Physical Society
2020 Fall Meeting of the APS Division of Nuclear Physics
Volume 65, Number 12
Thursday–Sunday, October 29–November 1 2020; Time Zone: Central Time, USA
Session KN: Instrumentation: Neutrons, Scintillators, and Spectrometers |
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Chair: Michael Febbraro |
Saturday, October 31, 2020 8:30AM - 8:42AM |
KN.00001: Simulating response of C$^7$LYC detector for fast neutron detection Sudipta Saha, Partha Chowdhury, Andrew M. Rogers, Peter C. Bender A detailed Monte Carlo simulation code has been developed to study the response of $^7$Li-enriched Cs$_2$LiYCl$_6$(C$^7$LYC) detectors using the Geant4 simulation framework. The intrinsic efficiency of a 1” thick shell of C$^7$LYC material is calculated for fast neutrons in the range 0.5 - 8 MeV and are compared with prior MCNP simulations and data. Contributions from $^{35}$Cl(n,p) and $^{35}$Cl(n,$\alpha$) reactions are differentiated and studied in the simulated spectrum. The detector efficiency as a function of energy is deduced using different cross-section evaluations and recent experimental measurements. Light output for both 3" x 3" and 1" x 1" C$^7$LYC detectors were simulated according to the Birks equation, with parameters deduced from experimental spectra. From this quenching factors for the light output of alphas and protons in C$^7$LYC are calculated from calibrated gamma-ray spectra. The simulations will be discussed in the context of benchmarking C$^7$LYC as an emerging scintillator for fast neutron measurements. [Preview Abstract] |
Saturday, October 31, 2020 8:42AM - 8:54AM |
KN.00002: Development of position and n/g discriminant neutron detector modules Dustin Scriven, Greg Christian, Grigory Rogachev, Cody Parker, Lee Sobotka, Tony Ahn, Grigory Chubarian, Shuya Ota, Yevgin Koshchiy, Anthony Thomas, Eric Aboud, Jack Bishop We present progress in the development of a neutron detector module made with p-terphenyl, a bright, fast, n/g discriminating solid organic scintillator. The module is comprised of medium sized p-terphenyl crystals that have been optically coupled together to create a pseudo-bar module. While only relying on two photo detectors the PB is capable of distinguishing interactions between six or more crystals. Furthermore, the module retains the p-terphenyl's pulse shape discrimination (PSD) capability. Here we present the characteristics of the module -- the pulse shape and position discrimination, as well as the timing resolution, and briefly discuss future plans for these modules. [Preview Abstract] |
Saturday, October 31, 2020 8:54AM - 9:06AM |
KN.00003: An Optically Segmented Neutron Scatter Camera for Neutron Imaging Applications Evan Adamek The Single Volume Scatter Camera (SVSC) Collaboration is a multi-institution effort led by Sandia National Laboratories to develop portable neutron imaging systems for a variety of applications in nuclear non-proliferation and arms control. The SVSC project seeks to improve on existing state-of-the-art neutron emission imaging systems by improving the geometrical efficiency through the reconstruction of multiple MeV-scale neutron scatters within a single volume. Among several simultaneous efforts with this concept, the optically segmented approach utilizes an array of scintillating bars to detect a pair of consecutive neutron scatters. The position and energy of the scatters can be reconstructed through the pulse timing and energy in the photodetectors at both ends of each bar. Systematic concerns regarding the electronic and optical crosstalk, optical coupling, and reflective wrapping for the scintillator bars have been explored and efforts to characterize and mitigate these effects are ongoing. Results for the current and next generation prototypes will be discussed. [Preview Abstract] |
Saturday, October 31, 2020 9:06AM - 9:18AM |
KN.00004: Plastic Scintillation Detectors for Time-of-Flight Mass Measurements Kailong Wang, S. Samaranayake, A. Estrade, S. Neupane, M. Barber, M. Famiano, T. Ginter, D. McClain, N. Nepal, J. Pereira, H. Schatz, G. Zimba Fast timing detectors play a key role in the experimental setup for time-of-flight (ToF) mass measurements of unstable nuclei. Two scintillation detectors with each consisting of one thin plastic scintillator and four photomultiplier tubes (PMTs) have been developed for the ToF mass measurement experiments at the National Superconducting Cyclotron Laboratory (NSCL). In this presentation, we will present results of a test experiment for the detectors using $^{48}$Ca beam at the NSCL. Different factors affecting the timing performance were systematically investigated during the test, and the best achieved time resolution ($\sigma$) of the detectors was 7.5 ps. We also evaluated the ability of positioning the hitting points on the scintillator using the timing information and obtained a resolution ($\sigma$) below 1 mm for well-defined beam spots. In addition, a switched capacitor digitizer (CAEN 742) was tested to process the signals from our scintillation detectors using a table-top laser setup. The optimization and evaluation of different algorithms for deriving the signal amplitude and time information will be discussed. [Preview Abstract] |
Saturday, October 31, 2020 9:18AM - 9:30AM |
KN.00005: Scintillator Calibration for MUSE Anne Flannery The MUon Proton Scattering Experiment (MUSE) at the Paul Scherrer Institute will measure the muon-proton and electron-proton elastic cross sections in the same~experiment. The experimental setup of MUSE includes various plastic scintillation detectors for triggering, particle and reaction identification, monitoring, and time-of-flight measurements. The larger elements of these detectors are made of organic plastic scintillators (EJ-204)~and are read out with Hamamatsu R13435 photomultiplier tubes. The~precise knowledge of the detection threshold and efficiencies, as well as quantitative comparisons with Monte Carlo simulations, require an absolute energy~calibration of the scintillators. In this presentation, we will discuss the gamma-calibration methods for the MUSE scintillation detectors. [Preview Abstract] |
Saturday, October 31, 2020 9:30AM - 9:42AM |
KN.00006: Scintillation yield from electronic and nuclear recoils in superfluid helium-4 Ryan Smith, Ethan Bernard, Andreas Biekert, Junsong Lin, Daniel McKinsey, Roger Romani, Burkhant Suerfu, Vetri Velan, Lanqing Yuan, Scott Kravitz, Scott Hertel, Pratyush Patel, Douglas Pinckney, Alessandro Serafin Superfluid He-4 is a promising target material for direct detection of light (\textless 1 GeV) dark matter. Signal channels for dark matter - nucleus interactions in superfluid helium include prompt photons, triplet excimers, rotons and phonons, but measurement of these signal strengths have yet to be performed for low energy nuclear recoils. A study of scintillation yield from electronic and nuclear recoils was carried out in superfluid He-4 at \textasciitilde 1.75 Kelvin, with deposited energy in the range of 10-1000 keV. Scintillation from a 16 cm$^{\mathrm{3}}$ volume of superfluid He-4 was read out by six PMTs immersed in the superfluid.Yields of both prompt and delayed scintillation components were measured. Elastic scattering of 2.8 MeV neutrons (generated by a deuterium-deuterium neutron generator) from superfluid He-4, with a liquid organic scintillator module used as far-side detector, was used to determine the scintillation signal yield for a variety of nuclear recoil energies. For comparison, Compton scattering of Cs-137 gamma-rays from the superfluid He-4, with NaI scintillators used as far-side detectors, was used to determine the scintillation signal yield of electronic recoils.~ [Preview Abstract] |
Saturday, October 31, 2020 9:42AM - 9:54AM |
KN.00007: Performance and optimization of transition-edge sensor based photon detectors for CUPID Vivek Singh CUPID (CUORE Upgrade with Particle ID) is a proposed tonne-scale $0\nu\beta\beta$ experiment that will use arrays of low-temperature calorimeters to probe the Majorana nature of neutrinos. Background rejection will be possible by reading out phonon and photon signals simultaneously from a scintillating crystal; Li$_2$MoO$_4$ crystals have been chosen as the baseline detectors for CUPID. We are developing sensitive low temperature calorimeters that can measure tiny amounts of scintillation light. The detectors use a novel Ir-Pt bilayer superconducting transition-edge-sensor (TES) that can be operated below down to ~10 mK. We will present an overview of the fabrication and characterization of a TES based calorimeter which is optimized for CUPID. We will also present an analysis of the pulses using a thermal model. [Preview Abstract] |
Saturday, October 31, 2020 9:54AM - 10:06AM |
KN.00008: Development of LACES and MUSES Conversion Electron Spectrometers at LSU* Sergio Lopez, S. T. Marley, J. M. Allmond, M. Carpenter, B. Crider, J. A. Clark, P. Copp, F. Kondev, G. E. Morgan, K. Rykaczewski, G. Savard, B. Sudarsan At rare-isotope beam facilities, a wealth of nuclear data is being accumulated. However, in almost all cases, the crucial spin and parity assignments, the primary goal of many nuclear spectroscopy studies, are based on theoretical and/or systematic arguments and lack experimental verification. Conversion Electron (CE) spectroscopy can be used to directly determine gamma-ray transition multipolarities, and in turn provide experimental information about the states in the daughter nucleus, and indirectly, for the properties of the parent. I will present details of two CE spectrometers under development at LSU. The LSU-Argonne Conversion Electron Spectrometer (LACES) will be integrated with the X-Array High-Purity Germanium detectors and Scintillator and Tape Using Radioactive Nuclei (SATURN) moving tape collector system at ANL. The Multi-Segment Electron Spectrometer (MUSES) is a nine-segment Si(Li) detector that will be used in conjunction with the Clover Array for Radioactive ION beams (CLARION) to study activated samples at ORNL. Spectrometer designs, preliminary performance, and plans for commissioning will be presented. *Supported by Louisiana State Board of Regents RCS LEQSF(2016-19)-RD-A-09. Work at ANL and ORNL funded by the U.S. Department of Energy, Office of Nuclear Physics, under Award No. DE-AC02-06CH11357 and DE-AC05-00OR22725, respectively. [Preview Abstract] |
Saturday, October 31, 2020 10:06AM - 10:18AM |
KN.00009: Jefferson Lab HRS Optimization Measurement for the PRex-II Experiment Siyu Jian, Nilanga Liyanage The RMS radius of the neutron distribution in a heavy nucleus $R_N$ provides an important test of nuclear theory. Furthermore $R_N$ is used in the determination of the density dependence of symmetry energy of neutron rich matter; this dependence is an important input in neutron star structure, heavy iron collision and atomic parity violation experiment calculations. The PRex-II experiment was performed from June to September 2019 to measure $R_N$ for the $^{208}$Pb nucleus using the parity violating weak neutral interaction. This experiment was done in Jefferson lab experimental hall A using the High Resolution Spectrometer (HRS) pair. This talk with present the preliminary results from HRS Optics calibration measurements for the PREX-II and will discuss the implication of these calibration results on the systematic error in $R_N$. [Preview Abstract] |
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