Bulletin of the American Physical Society
83rd Annual Meeting of the APS Southeastern Section
Volume 61, Number 19
Thursday–Saturday, November 10–12, 2016; Charlottesville, Virginia
Session J3: Nuclear Physics III |
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Chair: Nilanga Liyangage, University of Virginia Room: Monroe Room |
Friday, November 11, 2016 3:45PM - 3:57PM |
J3.00001: Systematic Uncertainties of the Firez Interference Term in the Free Neutron Beta Decay of the Nab Experiment Huangxing Li The Nab experiment is under construction at the SNS, with the goal to measure two parameters in free neutron beta decay: (a) the electron-antineutrino correlation $a$ to a precision of $\delta a / a = 10^{-3}$ and (b) the Fierz interference term $b$ to $\delta b = 3\times10^{-3}$. The Fierz interference term $b$ will be extracted from a measurement of the neutron beta decay spectrum. These results will be used to determine the ratio of nucleon axial-vector coupling to vector coupling up to a precision of $0.03\%$, and thus test the unitarity of CKM matrix, as well as to search for beyond the Standard Model Physics through S,T interactions. We will present simulations required for a thorough analysis of the systematic uncertainties in the Fierz term measurement. [Preview Abstract] |
Friday, November 11, 2016 3:57PM - 4:09PM |
J3.00002: TPC for sPHENIX: New Opportunities to Explore the Early Universe Alexander Link, Victoria Greene, Sourav Tarafdar The observed quark-gluon plasma (QGP), a deconfined state of quarks and gluons, poses a number of exciting new questions in the field of high-energy nuclear physics. Produced from the collision of heavy ions at relativistic speeds, efforts are now being made to determine many of the properties of this primordial state of matter. The sPHENIX project is a proposed upgrade to its predecessor PHENIX featuring advanced new capabilities to further the detection, and ultimate understanding of new phenomena related to the QGP. Simulations were run to determine the most effective tracking system design from a variety of candidates based on the criteria required to achieve the physics goals of our experiment. After considering the benefits and drawbacks of each design, the sPHENIX project ultimately decided to choose a design featuring a Time Projection Chamber (TPC). Once this decision was made, simulations were conducted in order to quantify the charge density, electric field and track distortions so that these confounding factors could be compensated for when collecting and analyzing data. This presentation depicts the results of these simulations and shows how these results inform the design of the tracking system. [Preview Abstract] |
Friday, November 11, 2016 4:09PM - 4:21PM |
J3.00003: Study of Polarized $^3$He Performance in Tokamak Fuel Pellets Jie Liu Nuclear fusion has long been considered an ultimate solution for a clean, renewable, and powerful energy production. Despite decades of research, ignition, or self-sustained energy production, has not been reached in any of fusion reactors built so far. The use of spin-polarized fuel in a tokamak reactor would provide a significant boost. It was predicted that the fusion cross section between deuterium (D) and tritium (T) is boosted 50\% when both D and T fully polarized along the local magnetic field. However, their polarization survival in a plasma environment has never been tested. An approach was developed to perform a direct test in the DIII-D tokamak in San Diego, using the mirror reaction D + $^3$He= $\alpha$+ p. This proof-of-principle experiment would use inertial confinement fusion (ICF) pellets containing either hyperpolarized D (in the form of solid HD) or hyperpolarized $^3$3He, which would be injected directly into the plasma core. A series of tests were done to demonstrate the ability to fill inertial confinement fusion (ICF) polymer pellets with pressurized polarized $^3$He, using data acquired with a clinical 1.5-T magnetic resonance imaging (MRI) scanner. Prelimilary results about the polarized $^3$3He performance in the pellets will be presented in this talk. [Preview Abstract] |
Friday, November 11, 2016 4:21PM - 4:33PM |
J3.00004: Effect of Thermal Treatment on Electrical Properties of CZT Detectors Jonathan Lassiter, Stephen Babalola, Kwyntero Kelso, Raequane Jones In order to understand the contributing factors responsible for the diminished electrical properties during annealing, CZT samples were annealed in the temperature range of 100 - 400$^{\mathrm{o}}$C. Following each thermal treatment measurements of infrared microscopy, current-voltage characteristics, and X-ray photoelectron spectroscopy were performed in order to determine changes in bulk defect morphology, electrical properties, and surface material degradation, respectively. Samples annealed at 300$^{\mathrm{o}}$C demonstrated improvements in the electrical properties of the detector while thermal treatments at 400$^{\mathrm{o}}$C were shown to approximate a critical temperature of deterioration. Reduction in leakage current was observed at elevated temperatures up to 300$^{\mathrm{o}}$, after which increased leakage current was observed at higher temperatures, consistent with previous studies. Attempts were made to explain this critical temperature. [Preview Abstract] |
Friday, November 11, 2016 4:33PM - 4:45PM |
J3.00005: Searching for the Impetus of the EMC Effect. Jason Bane, Doug Higinbotham, Nadia Fomin Physicists use scattering experiments to gain a greater understanding of a nucleon's behavior in the nucleus and how the nucleons and the underlying quark distribution are modified by the nuclear medium. In the last few years, there have been a large number of publications that focus on the possible connection between the deep inelastic EMC effect and the x greater than1 two-nucleon correlation plateaus. We will investigate how the momentum distribution of a target nucleon effects deep inelastic scattering results using a Monte Carlo technique. This may help create a better understanding of the connection between the EMC effect and the two-nucleon correlation plateaus. [Preview Abstract] |
Friday, November 11, 2016 4:45PM - 4:57PM |
J3.00006: Design and Simulation of a Polarized Pure Photon Source for Compton Scattering from Solid Polarized Targets Donal Day, Dustin Keller, Darshana Perera, Jixie Zhang Wide angle compton scattering from polarized protons holds great promise: access to the generalized parton distribution functions $\mathcal{\widetilde{H}}$ and $\mathcal{E}$ with different weighting and moments than in other hard exclusive processes, emphasizing the $u$-quarks and the valence region. Previously, experiments were proposed using bremsstrahlung from polarized electrons striking a radiator. Unfortunately the mixed electron-$\gamma$ beam limit polarized target performance due to radiation damage and restricted luminosity owing to the heat load. We have designed a pure photon beam line by placing a dipole magnet after the radiator which deflects the electrons away from the target and into a beam dump. This approach has many benefits which include an order of magnitude increase in the photon luminosity and unrestricted use of transversely polarized targets while preserving robust target performance. We will discuss the physics motivation, the design (of two different options) as well as the G4beamline simulation results of the source. [Preview Abstract] |
Friday, November 11, 2016 4:57PM - 5:09PM |
J3.00007: The model of complex structure of fundamental body and hadron Rongwu Liu Orthodox idea holds that, hadron is composed of fundamental particle quarks which carry mass, electricity, flavor, and color, the fundamental particle quarks are some point-like particles. This article proposes that, fundamental body (such as quark, electron, etc) is composed of fundamental particle (fundamental matter mass and electricity) and fundamental volume field (fundamental matter flavor and color), the fundamental particle lies in the center of fundamental volume field, forms the ``nucleus'' of fundamental body. According to the ``combination principle of the least intensity of fundamental body'', there exists a kind of fundamental body which only carries fundamental matter mass, it could be dark matter particle. According to the absoluteness of volume motion of volume field and the condition that volume-field-like fundamental body exists, there exist volume-field-like quark and neutrino which carry moving (or pulsating) fundamental volume field. Based on these concepts, this article further proposes a model of complex structure of hadron (or model of atom-like structure of hadron) which is composed of hadronic nucleus (the so-called ``hadron'' in particle model) and extranuclear quarks, the hadronic nucleus is further composed of particle-like quarks, the extranuclear quarks are all volume-field-like quarks. According to this model, different mechanisms of strong (or weak) interaction, the collision of high energy hadrons, black hole, and the state of universe before Big Bang are given. [Preview Abstract] |
Friday, November 11, 2016 5:09PM - 5:21PM |
J3.00008: Polarized Drell-Yan Experiments Gonaduwage Perera Polarized Drell-Yan scattering mediated by $\gamma^{*}/Z$ is currently being studied through collider experiment at RHIC, as well as through fixed target experiment at CERN. Future experiments in Europe (CERN), Japan (JPARC) and the USA (FNAL, RHIC) are also being planned. Measurement of the longitudinal double spin asymmetry ($A_{LL}$) in the Drell-Yan process in pp collisions provides clean access to the anti-quark helicity distributions without involving quark fragmentation functions. Measurement of the transversely polarized single spin asymmetry ($A_{N}$) in the Drell-Yan process in fixed target/collider experiments provide the ability to test predicted universal and process-dependent features of transverse momentum dependent (TMD) PDFs. In this talk the wide range of Drell-Yan experiments and their measurements will be discussed. [Preview Abstract] |
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