Bulletin of the American Physical Society
85th Annual Meeting of the APS Southeastern Section
Volume 63, Number 19
Thursday–Saturday, November 8–10, 2018; Holiday Inn at World’s Fair Park, Knoxville, Tennessee
Session G04: Nuclear Physics II |
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Chair: Grant Riley, University of Tennessee, Knoxville Room: Holiday Inn Knoxville Downtown Parlor |
Friday, November 9, 2018 2:00PM - 2:12PM |
G04.00001: PROSPECT, the Precision Reactor Oscillation and SPECTrum experiment Xiaobin Lu, Alfredo Galindo-Uribarri PROSPECT is a reactor-based short-baseline anti-neutrino experiment deployed at the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory (ORNL) and taking data since March 2018. |
Friday, November 9, 2018 2:12PM - 2:24PM |
G04.00002: First Monte Carlo global QCD analysis of pion parton distributions Patrick C Barry, Nobuo Sato, Wally Melnitchouk, Chueng-Ryong Ji In this work, we determined the parton distribution function (PDF) of the pion. Previously, its PDF has been determined only by Drell-Yan (DY) experiments such as E615 and NA10 which only constrain the high momentum fraction region and the valence distribution. In the DY process, two hadrons collide, with one donating a quark and the other donating an antiquark, producing a dimuon pair. For lower momentum fractions, data was included from leading neutron (LN) electroproduction experiments such as H1 and Zeus done at HERA. An electron strikes a target proton, which transforms into a neutron. This process is dominated by the one-pion exchange. These data provide previously unseen constraints on sea quark and gluon PDFs. The PDFs we obtain reveal that at the input scale, the gluon carries a significant fraction of the pion momentum ∼30%, higher than predicted with only the DY data, and the sea carries ∼15% of the momentum fraction of the pion. We can also describe the dbar-ubar asymmetry in the proton using this pion PDF. |
Friday, November 9, 2018 2:24PM - 2:36PM |
G04.00003: Proton charge radius extraction from electron scattering data using dispersively improved chiral effective field theory Jose Alarcón, Douglas W Higinbotham, Christian Weiss, Zhihong Ye In electron scattering, the proton radius is determined by determining the slope of the charge form factor at a Q2 of zero. Typically this requires extrapolating fits of the experimental data and will give different radii depending on the function used. I will present a radius extraction using a novel theoretical framework based on analyticity and first-principles dynamical input from chiral EFT (dispersively improved chiral EFT, DIchEFT). The spacelike form factor data are compared with the DIchEFT predictions for various fixed radii, and the physical radius is determined by the best match between theory and experiment up to Q2 ~ 0.5 GeV2. We obtain a radius of 0.844(7) fm, in agreement with the high-precision muonic hydrogen results. |
Friday, November 9, 2018 2:36PM - 2:48PM |
G04.00004: Onset of the color transparency (CT) at 12 GeV in Hall C at Jefferson Lab Deepak Bhetuwal Color Transparency (CT) is a unique prediction of QCD where the final (and/or initial) state interactions of hadrons with the nuclear medium are suppressed for exclusive processes at high momentum transfers. The onset of CT has never been conclusively observed for baryons. A clear signal for the onset of CT for baryons would show the transition from the nucleon-meson picture to quark-gluon degrees of freedom. Experiment E12-06-107 seeks to measure proton transparency (PT) using the A(e, e'p) proton knockout reaction with the recently upgraded 12 GeV e- beam along with HMS and SHMS spectrometers in HallC at JLab. Data were collected on a 12C target over the range of Q2 = 8 – 14.3 (GeV/c)2 covering the region where a previous A(p,2p) experiment at BNL had observed an enhancement. Additional data on 1H target were collected to determine the elementary process. A rise in the PT as a function of Q2 is predicted to be a signature of the onset of CT. |
Friday, November 9, 2018 2:48PM - 3:00PM |
G04.00005: Development of a magnetometer system to monitor stray magnetic fields near PROSPECT detector Corey E Gilbert, Alfredo Galindo-Uribarri PROSPECT is a reactor antineutrino experiment located in the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory (ORNL). PROSPECT's primary goals are to probe short-baseline oscillations and perform a precise measurement of the U-235 reactor antineutrino spectrum. The detector consists of 154 segmented cells filled with $^6$Li-doped liquid scintillator. Each segment holds two PMTs, one on each end of the cell. The PMTs can be exposed to stray magnetic fields from superconducting magnets operating on the experiment hall one floor below the detector. The monitoring of the magnetic fields is an important part of our background characterization as the magnetic fields can directly influence the energy measurement. This study presents the characterization and monitoring of stray magnetic fields using a compact, low cost system of triple axis magnetometers near the PROSPECT detector. Applications of magnetic field monitoring system in other areas of physics will also be discussed. |
Friday, November 9, 2018 3:00PM - 3:12PM |
G04.00006: Temperature Dependence studies of the 6Li-doped liquid scintillator used in PROSPECT Brennan T Hackett, Michael Febbraro, Alfredo Galindo-Uribarri, Corey Gilbert Organic scintillator detectors are used for a broad number of applications in nuclear science, neutrino physics, security and nonproliferation. PROSPECT utilizes a segmented 6Li-doped liquid scintillator detector for efficient detection through the inverse beta decay and excellent background discrimination. The PROSPECT experiment, is designed to make a precise measurement of the antineutrino spectrum from a highly-enriched uranium reactor and to probe eV-scale sterile over meter-long baselines. The novel 6Li-doped liquid scintillator has high light yield and powerful pulse-shape discrimination (PSD) capabilities. Recently, we have characterized the temperature dependence of the light output, the viscosity and the PSD of this scintillator and compared it to the commercial EJ309 scintillator. Experimental techniques and results will be presented. |
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