Bulletin of the American Physical Society
82nd Annual Meeting of the APS Southeastern Section
Volume 60, Number 18
Wednesday–Saturday, November 18–21, 2015; Mobile, Alabama
Session A1: Nuclear Physics I |
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Chair: Mohammad Ahmed, North Carolina Central University/TUNL Room: Riverview Plaza Hotel Bon Secour Bay Ballroom I |
Thursday, November 19, 2015 8:30AM - 9:06AM |
A1.00001: The Charged Particle Spectroscopy Program at TUNL Invited Speaker: Richard Longland Nuclear processing of matter provides the energy that makes stars shine and was responsible for the creation of the elements. For most of a stars life, this processing occurs at low energies, where charged particle reaction cross sections are often too small to measure using conventional methods. Studying these cross sections directly in the laboratory therefore requires high beam flux and low-background detection systems. To circumvent these limitations, novel methods can be employed, such as particle transfer measurements. At the Triangle Universities Nuclear Laboratory, we recently began a new charged particle spectroscopy program using an upgraded Enge Split-pole Spectrograph. Using this powerful equipment, we can better understand the nuclear structure underlying astrophysical reactions and thus constrain their cross sections. I will describe the Enge Spectrograph research program, detailing recent upgrades and experimental progress, and will highlight our plans for further upgrades. [Preview Abstract] |
Thursday, November 19, 2015 9:06AM - 9:42AM |
A1.00002: Neutron-neutron quasifree scattering in nd breakup at 10 MeV Ronald Malone The neutron-deuteron system provides a rich environment for testing theoretical models of the neutron-neutron ($nn$) interaction. Theoretical predictions based on rigorous ab-initio calculations using modern nucleon-nucleon ($NN$) interaction potentials agree well with most experimental data for this system. However, some discrepancies remain, such as the $nn$ quasifree scattering (QFS) cross section in neutron-deuteron breakup. Recent experiments at incident neutron energies of 26 and 25 MeV have measured cross sections for this process that are larger than theoretical predictions by almost 20\%. These results suggest substantially larger charge-symmetry breaking than is in current models of the $NN$ interaction and the possible existence of a di-neutron bound state. Due to the significant implications of these results, we are performing measurements of the $nn$ QFS cross section at Triangle Universities Nuclear Laboratory. These measurements utilize time-of-flight techniques with a pulsed neutron beam at energies below 20 MeV. Data has been collected at an incident neutron energy of 10 MeV for one angular configuration. Preliminary results from this measurement will be presented and plans for future measurements at higher energies at several angles will be discussed. [Preview Abstract] |
Thursday, November 19, 2015 9:42AM - 10:18AM |
A1.00003: Research activities using High Intensity Gamma-ray Source facility at TUNL Invited Speaker: Krishichayan . Current ongoing research activities using the High Intensity Gamma-ray source (HI$\gamma$S) facility at TUNL will be presented. Experimental setup, analysis, and results will be focused on the following low-energy activities: (1) Mono-energetic photon induced $^{235}$U/$^{239}$Pu fission cross-section ratio measurements at $E_{\gamma}$ = 8 - 13 MeV, (2) Mono-energetic photon induced Fission-Product-Yield measurements on $^{235}$U, $^{238}$U, and $^{239}$Pu at $E_{\gamma}$ = 11.0 and 13.0 MeV, and (3) Systematic study of Pygmy Dipole Resonances in nuclei across the nuclear landscape. [Preview Abstract] |
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