Bulletin of the American Physical Society
APS Ohio Section Fall 2020
Volume 65, Number 15
Friday–Saturday, October 16–17, 2020; VIRTUAL
Session F02: Low and Intermediate Energy Nuclear Physics |
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Chair: Andrea Richard, Michigan State University |
Saturday, October 17, 2020 11:15AM - 11:30AM |
F02.00001: Cost effective production of solid Hg targets useful for measuring nuclear reaction cross-sections. Khushi Bhatt, Shivi Saxena, Ramakrishna Guda, Asghar Kayani, Michael Famiano The rarest of all the stable nuclei that exist in the universe are p-nuclei (proton-rich nuclei). The astrophysical processes responsible for their synthesis is not properly understood. The heaviest p-nucleus, Hg196, is studied through the method of activation, to better understand (p, $\gamma )$, ($\alpha $, $\gamma )$ and (p, n) reaction cross-sections. The experiment requires solid mercury target with thickness between 1 mg/cm$^{\mathrm{2}}$ and 10 mg/cm$^{\mathrm{2}}$. Production of solid Hg targets is technically challenging. Challenges include reducing contaminants in compound targets, creating targets of uniform thickness, and creating the targets that are self-supporting. Cost effective production processes such as palletization, drop casting, electroplating, amalgamation and wet chemistry methods will be discussed along with advantages and disadvantages. Target characterization will also be presented. [Preview Abstract] |
Saturday, October 17, 2020 11:30AM - 11:45AM |
F02.00002: Inferring Neutron star properties with SpiRIT heavy-ion collision experiment. Chun Yuen Tsang, Manyee Betty Tsang, William Lynch, Jon Barney, Justin Estee, Genie Jhang, Rensheng Wang, Tadaaki Isobe, Masanori Kaneko, Mizuki Kurata-Nishimura, Jung Woo Lee The material that Neutron star (NS) composes of is similar to the overlap region created temporarily from the collisions of heavy ions because they are both described by the same nuclear Equation of State (EoS). Therefore, studying compressed heavy ions is beneficial to our understanding of NS properties, such as the mass-radius relation of NS and the gravitational waveform of NS merger event such as GW170817 from LIGO/VIRGO collaboration. In particular, the ratio of the amount of $\pi $- to $\pi +$ fragments ($\pi $- /$\pi +)$ created as the compressed heavy ions disintegrates is strongly sensitive to the curvature parameter Lsym of nuclear EoS, which in-turn is strongly sensitive to NS properties. To this end, we performed the SpiRIT experiment in which radioactive $^{\mathrm{132}}$Sn {\&} $^{\mathrm{108}}$Sn isotopes are generated and accelerated to relativistic speed by Rare Isotope Beam Factory (RIBF) in RIKEN, and are set to collide with stationary $^{\mathrm{124}}$Sn {\&} $^{\mathrm{108}}$Sn targets respectively. The collision compresses the nucleus to higher density before they disintegrate into fragments. The amount and momentum of pion fragments are measured with SAMURAI Pion Reconstruction and Ion Tracker (SpiRIT) Time Projection Chamber (TPC) immediately downstream of the target. In this talk, I will present a Bayesian analysis of the data with a transport quantum Molecular Dynamic model to constrain the EoS parameters. [Preview Abstract] |
Saturday, October 17, 2020 11:45AM - 12:00PM |
F02.00003: Neutron detection with Large Area Neutron Array (LANA) at NSCL Fanurs C.E. Teh, Jong-Won Lee, Kuan Zhu, Kyle Brown, Zbigniew Chajecki, William Lynch, Manyee Betty Tsang, Adam Anthony, Jon Barney, Daniele Dell'Aquila, Justin Estee, Byungsik Hong, Genie Jhang, Om Khanal, Young Jin Kim, HyoSang Lee, Jung Woo Lee, Juan Manfredi, Seon-Ho Nam, Chenyang Niu, Jeonghyeok Park, Sean Sweany, Chun Yuen Tsang, Rensheng Wang, Hongyi Wu In this meeting, I will present the performance of LANA including a new technique to do pulse shape discrimination (PSD), which gives n-gamma separation that is more superior to the traditional PSD technique especially for long bar-shaped scintillators and measured light output from 10-100 MeV neutrons. [Preview Abstract] |
Saturday, October 17, 2020 12:00PM - 12:15PM |
F02.00004: Fission in the neutron-deficient lead region Adam Anthony, Yassid Ayyad, Jon Barney, Daniel Bazin, Saul Becceiro, Kyle Brown, Zbigniew Chajecki, Jie Chen, Kaitlin Cook, Justin Estee, Thomas Ginter, Elain Kwan, William Lynch, Wolfgang Mittig, Chenyang Niu, Andrew Pype, Chandana Sumithrarachchi, Sean Sweany, Chi-En Teh, Chun Yuen Tsang, M.B. Tsang, Rensheng Wang, Nathan Watwood, Sarah Wegert, Joseph Wieske Rare isotope beam facilities offer the opportunity to study the physics of isotopes far from stability. Following the discovery of an unexpected region of asymmetric beta-delayed fission in the neutron deficient mercury region, there has been a flurry of work to study fission properties of other nuclei in the region. At the National Superconducting Cyclotron Laboratory (NSCL), an experiment was designed to measure the fission properties of nuclei in the transition region from asymmetric to symmetric fission. A radioactive beam centered around Pb$^{\mathrm{197}}$ was produced by the coupled cyclotrons at the NSCL. To extract information about the fission barrier, the helium-induced fusion-fission cross section was measured as a function of beam energy. The Active-Target Time Projection Chamber (AT-TPC) served as the helium gas target and was used to separate fusion-fission events from the background. This talk focuses on using a TPC to measure the properties of fission events in an inverse-kinematics setting. [Preview Abstract] |
Saturday, October 17, 2020 12:15PM - 12:30PM |
F02.00005: A new $\Delta E$-ToF particle identification device Chenyang Niu, Adam Anthony, Yassid Chajecki, Jon Barney, Daniel Bazin, Saul Becceiro, Kyle Brown, Zbigniew Chajecki, Jie Chen, Kaitlin Cook, Justin Estee, Thomas Ginter, Elain Kwan, William Lynch, Wolfgang Mittig, Andrew Pype, Chandana Sumithrarachchi, Sean Sweany, Chi-En Teh, Chun Yuen Tsang, Betty Tsang, Rensheng Wang, Nathan Watwood, Sarah Wegert, Joseph Wieske The particle identification (PID) technique plays a key role in radioactive isotope beams experiments. To support a fission experiment recently finished in the n-deficient lead region, a new PID device was developed using the time-of-flight (ToF) and energy loss ($\Delta E$) method. Two microchannel plate (MCP) detectors were installed to measure the ToF. A new gridded ion chamber with 13 segmented pads was designed and built to provided both $\Delta E$ measurement and beam tracking. The performance of the $\Delta E$-ToF device was tested with both stable and radioactive beams. The secondary beam was well separated by this device in the experiment. In this talk, the construction and experimental performance of the $\Delta E$-ToF device will be described. [Preview Abstract] |
Saturday, October 17, 2020 12:30PM - 12:45PM |
F02.00006: PID Determination and Charge State Contamination Joseph Wieske, Adam Anthony, Yassid Ayyad, Jon Barney, Daniel Bazin, Saul Becceiro, Kyle Brown, Zbigniew Chajecki, Jie Chen, Kaitlin Cook, Justin Estee, Thomas Ginter, Elain Kwan, William Lynch, Wolfgang Mittig, Chenyang Niu, Andrew Pype, Chandana Sumithrarachchi, Sean Sweany, Chi-En Teh, Chun Yuen Tsang, M.B. Tsang, Rensheng Wang, Nathan Watwood, Sarah Wegert Studying properties and decays of heavy isotopes is a goal of rare isotope beam physics that comes with challenges. Even if separation of isotopes is achieved using particle identification (PID) systems, the isotopic species remain to be determined, and charge state contamination must be quantified. The National Superconducting Cyclotron Laboratory (NSCL) recently conducted an experiment to measure the fission properties of nuclei in the neutron deficient Pb region. A radioactive cocktail beam was tuned in the A1900 fragment separator to allow for separation of isotopes. The beam was identified using the $\Delta $E-ToF method. In order to quantify charge state contamination, a total kinetic energy measurement of the beam was made using Si PIN detectors. In addition, a high purity Germanium crystal (HPGe) measured the decay of long lived isomers for beam tagging to provide another measure of charge state contamination. This talk will discuss the methods of isomer-tagging and measurement of charge state contamination. [Preview Abstract] |
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