Bulletin of the American Physical Society
2016 Fall Meeting of the APS Division of Nuclear Physics
Volume 61, Number 13
Thursday–Sunday, October 13–16, 2016; Vancouver, BC, Canada
Session PC: Nuclear Astro V |
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Chair: Barry Davids, TRIUMF Room: Junior Ballroom B |
Sunday, October 16, 2016 10:30AM - 10:42AM |
PC.00001: Progress Towards Optical Single Atom Detection for Nuclear Astrophysics Jaideep Singh, Jennifer Wenzl, Dustin Frisbie, Kristen Parzuchowski, Maegan Johnson We are developing the technique of optically detecting individual atoms embedded in thin films of cryogenically frozen solids. Noble gas solids such as frozen neon are an attractive medium because they are optically transparent and provide efficient, pure, stable, \& chemically inert confinement for a wide variety of atomic and molecular species. We propose to couple this new detection technique to a recoil separator with the goal of measuring rare nuclear reactions relevant for nuclear astrophysics. Because of the additional selectivity provided by the atomic transitions of the captured atom, this detection scheme would help loosen the often demanding beam rejection requirements imposed on recoil separators. Our initial focus is the $^{22}$Ne($\alpha$,$n$)$^{25}$Mg reaction, which is an important source of neutrons for the $s$-process. We will describe our measurements of the atomic \& optical parameters needed to optimize the optical layout as well as a promising design for a prototype detector. [Preview Abstract] |
Sunday, October 16, 2016 10:42AM - 10:54AM |
PC.00002: ABSTRACT WITHDRAWN |
Sunday, October 16, 2016 10:54AM - 11:06AM |
PC.00003: ABSTRACT WITHDRAWN |
Sunday, October 16, 2016 11:06AM - 11:18AM |
PC.00004: ABSTRACT WITHDRAWN |
Sunday, October 16, 2016 11:18AM - 11:30AM |
PC.00005: Decay Spectroscopy of Neutron-Rich Cd Around the N = 82 Shell Closure Nikita Bernier, Iris Dillmann, Reiner Kruecken The neutron-rich region around A = 132 is of special interest for nuclear astrophysics and nuclear structure. This region is connected with the second r-process abundance peak at A$\approx$130 and the waiting-point nuclei around N = 82. For nuclear structure studies, the neighbours of the doubly-magic $^{132}$Sn (Z = 50, N = 82) are an ideal test ground for shell model predictions. The beta-decay of the N = 82 isotope $^{130}$Cd into $^{130}$In was first investigated a decade ago, but the information for states of the lighter indium isotopes ($^{128,129}$In) is still limited. In the present experiment, a detailed gamma-spectroscopy of the beta-decay of $^{128-132}$Cd was achieved with the newly commissioned GRIFFIN (Gamma-Ray Infrastructure For Fundamental Investigations of Nuclei) gamma-ray spectrometer, which is capable of measuring down to rates of 0.1 pps. The low-energy cadmium isotopes were implanted into a movable tape at the central focus of the array from the ISAC-I facility at TRIUMF. The beta-tagging was performed using the auxiliary beta-particle detector SCEPTAR. The required beta-gamma(-gamma) coincidence data in high statistics needed to fill the spectroscopic gaps described in literature were obtained. The ongoing analysis of these data will be presented. [Preview Abstract] |
Sunday, October 16, 2016 11:30AM - 11:42AM |
PC.00006: Probing the Strength of Nuclear-Plasma Interactions at the National Ignition Facility A. Ratkiewicz, L. Berzak Hopkins, D.L. Bleuel, W.S. Cassata, R. London, C.A. Velsko, C.B. Yeamans, L.A. Bernstein, K. van Bibber, B.L. Goldblum, S. Siem, M. Weideking Electron-mediated interactions between nuclei and plasma are expected to affect nuclear reaction cross sections in High Energy Density Plasmas (HEDPs), which are the environment in which stellar nucleosynthesis occurs. However, attempts to measure the strength of these Nuclear Plasma Interactions (NPIs) have been hindered by the extreme narrowness of the nuclear transition ($\Gamma$ $\leq$ 1 $\mu$eV). We report on the planned effort to measure the strength of this effect in HEDPs to be produced at the National Ignition Facility (NIF) by inducing NPIs on highly-excited (1-5 MeV) nuclear states of $^{133}$Xe produced in the (n,2n) reaction with $^{134}$Xe in the NIF target. [Preview Abstract] |
Sunday, October 16, 2016 11:42AM - 11:54AM |
PC.00007: Performance of the St. George Detector System Luis Morales, Sunil Kalkal, Hyo Soon Jung, Chris Seymour, Gwenaelle Gilardy, Mike Moran, Zachary Meisel, Jerry Hinnefeld, Manoel Couder The St. George recoil mass separator at the University of Notre Dame will be used to study $(\alpha,\gamma)$ reactions of astrophysical interest. A detection system was developed for the St. George recoil mass separator, in collaboration with Indiana University South Bend, that will utilize energy and time-of-flight to separate reaction products from residual unreacted beam particles. The detection system uses two microchannel plate (MCP) detectors, perpendicular electric and magnetic field are used to bend secondary electrons from the surface of a parylene backed carbon foil to register timing measurements, and a silicon strip detector is used to measure the ion’s kinetic energy. The performance of the detection system will be presented. [Preview Abstract] |
Sunday, October 16, 2016 11:54AM - 12:06PM |
PC.00008: Commissioning of the JENSA gas jet target at NSCL Konrad Schmidt The Jet Experiments in Nuclear Structure and Astrophysics (JENSA) gas jet target enables the direct measurement of previously inaccessible reactions with reaccelerated radioactive beams at the National Superconducting Cyclotron Laboratory (NSCL), USA. JENSA is going to be the main target for the recoil separator for capture reactions (SECAR) at the Facility of Rare Isotope Beams (FRIB). Commissioning and first experiments at Oak Ridge National Laboratory (ORNL) showed a highly localized, pure gas target with a density of about $10^{19}$ atoms per square centimeter. Confirming results from recent thickness studies of the JENSA gas jet target at NSCL will be presented as well as preliminary results from a commissioning experiment studying the $^4$He($^{14}$N,p)$^{17}$O reaction at $\sim1.3\,$MeV/u with stable beams provided by the rare isotope beam facility ReA3 at NSCL. This research is supported by the U.S. Department of Energy and the National Science Foundation. [Preview Abstract] |
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