Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session G14: Applications of Nuclear Reactions |
Hide Abstracts |
Sponsoring Units: DNP Chair: Yassid Ayyad-Limonge, Michigan State University Room: Sheraton Plaza Court 3 |
Sunday, April 14, 2019 8:30AM - 8:42AM |
G14.00001: Nuclear Science and Security Experiments with PRISM R. J. Casperson, S. G. Anderson, J. A. Caggiano, R. O. Hughes, M. S. Johnson, R. A. Soltz, A. P. Tonchev Isotopic signatures from high-energy electron bremsstrahlung are key observables for a number of nuclear security applications, and these applications depend on specific nuclear data. The Photonuclear Reactions for Isotopic Signature Measurements (PRISM) accelerator is a state-of-the-art S-band electron linac at LLNL accelerator complex which will be used to acquire such data. In addition, a pulsed photo-fission neutron source will be generated using the same x-ray beam for neutron time-of-flight scattering experiments. Experimental capabilities and recent progress towards these experiments will be discussed. A methodology for constraining nuclear data with integral scattering experiments will also be discussed. |
Sunday, April 14, 2019 8:42AM - 8:54AM |
G14.00002: Nuclear Reactions Induced by Laser-Accelerated Light Ions Arnold Schwemmlein, Wolf Udo Schröder, Christian Stoeckl, Chad Forrest, Vladimir Yu. Glebov, Sean P. Regan, T. Craig Sangster, Wolfgang R. Theobald We report results of the first set of nuclear reaction experiments conducted with a novel platform that has been installed and set up at the high-power (~1018 W/cm2), short-pulse (10-ps) OMEGA EP laser system. In the setup, planar “converter” target foils are irradiated in a controlled fashion with a tightly focused short laser beam pulse. The laser pulse ionizes the converter and generates an enormous Coulomb field, which extracts charged particles from the converter back surface and accelerates them to MeV energies. In the present experiments, such “beams” of protons and deuterons are used to induce nuclear reactions in a secondary “physics” target placed closely behind the converter target. A satisfactory performance of the platform is demonstrated with a time-of-flight measurement of neutrons from the 9Be (d, n)10B stripping reaction, for which earlier data are available for comparison. |
Sunday, April 14, 2019 8:54AM - 9:06AM |
G14.00003: Neutron-Induced Breakup of Deuterium at 14 MeV Chad J Forrest, Arnoldas Deltuva, Udo-Wolf Schroeder, James P Knauer, Edward Michael Campbell, Gilbert W Collins, Radha Bahukutumbi, Vladimir Glebov, Owen M Mannion, Sean P Regan, Thomas C Sangster, Christian Stoeckl Abstract: The double-differential cross-section for neutron-induced breakup of deuterium D(n,2n)p at 14 MeV has been measured using an inertial confinement fusion (ICF) platform. Subnanosecond impulses of 1013 to 1014 14-MeV neutrons, generated in direct-drive laser ICF implosions, are used to irradiate deuterated targets on the OMEGA Laser System.1 The experimental double-differential cross section is well reproduced by three-body calculations using realistic NN and 3N nuclear forces. |
Sunday, April 14, 2019 9:06AM - 9:18AM |
G14.00004: Theoretical study of production of light and intermediatemass fragments from interaction of GCR-LIKE particles Mohammad S Sabra The nature of the secondary radiation field created by the |
Sunday, April 14, 2019 9:18AM - 9:30AM |
G14.00005: Feasibility of Using the H(n,el) Cross Section Reference in a White Source Neutron Beam with the fissionTPC Nicholas Walsh The Neutron Induced Fission Fragment Tracking Experiment built the fissionTPC as an instrument to precisely measure fission cross section ratios. Past and current measurements in this detector have used actinide references of 235U(n,f) and 238U(n,f). Employing a more precise cross section reference, such as H(n,el), has the potential to further reduce the evaluated cross section uncertainty. The fissionTPC is unique as it can simultaneously detect both fission fragments and protons with the same device. We provide a quantitative description for a measurement method using a hydrogenous gas target and the proton recoil kinematics to reconstruct the incident neutron energy. This method enables the fissionTPC to operate in a white-source neutron beam like that at LANSCE-WNR. We show such a measurement is feasible in the energy range of 0.5–10 MeV, however the precision is limited by the method of energy reconstruction. Using a direct measurement of neutron time-of-flight for the recoil proton or a mono-energetic neutron source would provide a path to a sub-percent precision measurement. |
Sunday, April 14, 2019 9:30AM - 9:42AM |
G14.00006: Modeling Multi-Nucleon Transfer Reactions Involving Heavy Nuclei Walter D Loveland, Vishal V Desai One of the most promising ways to make new n-rich heavy nuclei is through the use of multi-nucleon transfer (MNT) reactions. One needs reliable models to predict the outcomes of these reactions due to the difficulties of studying these reactions, which may have cross sections in the pb-nb region. We have made measurements of the yields of MNT products in the interaction of Ec.m. = 450 MeV 136Xe + 208Pb (235 yields), Ec.m. = 619 MeV 204Hg + 198Pt, (46 yields), Ec.m. = 451 MeV 136Xe + 198Pt (329 yields) and Ec.m. = 336 and 692 MeV 204Hg + 208Pb. We have compared these results with other measurements and with the predictions of the semi-classical GRAZING-F, di-nuclear system (DNS) and Intermediate Quantum Molecular Dynamics (ImQMD) models. We find that The GRAZING-F model correctly predicts the magnitudes of the transfer cross sections for small transfers, but underestimates the cross sections for large transfers. The DNS model underestimates the yields of the PLFs and most TLFs, while the ImQMD model does the best overall job of describing all the yields .We point out further possible tests of these models. |
Sunday, April 14, 2019 9:42AM - 9:54AM |
G14.00007: Systematic Studies of Fission Product-Yield Distributions from Neutron Induced Fission Anton P Tonchev, Jack A Silano, Mark Stoyer, Matthew Gooden, Jerry Wilhelmy, Werner Tornow, Calvin Howell, Sean Finch, FNU Krishichayan The distribution of fragment masses following fission is one of the most basic quantities that has been observed since the discovery of fission by Hahn and Strassmann in 1938, and these fission product yields (FPYs) are an important source of information that are used for basic and applied physics. We are performing a self-consistent, high-precision, and time-dependent FPY data for 235U, 238U, and 239Pu isotopes using monoenergetic and pulsed neutron beams for incident energies from 0.5 to 15.0 MeV. Using irradiations of varying duration, the energy dependence of the cumulative and independent yields have been measured for more than two dozen fission products, with half-lives ranging from minutes to months, on these targets. This work aims to provide a unique capability for self-consistent measurement of a much broader range of FPY data relevant to many applications. We will discuss the uniqueness of these FPY data thus will provide insights crucial for the development of fission theory as well as important benchmarks for new data evaluations based on high-precision differential fission products. |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700