Bulletin of the American Physical Society
APS April Meeting 2014
Volume 59, Number 5
Saturday–Tuesday, April 5–8, 2014; Savannah, Georgia
Session C7: Reactions: Hadrons & Light Nuclei |
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Sponsoring Units: DNP Chair: Sait Umar, Vanderbilt University Room: 201 |
Saturday, April 5, 2014 1:30PM - 1:42PM |
C7.00001: T-T Neutron Spectrum from Inertial Confinement Implosions Joseph Caggiano, Daniel Sayre, Carl Brune, Maria Gatu Johnson, Dennis McNabb, Andrew Bacher Measurements of the T($t,$2$n)\alpha $ fusion reaction (TT) have been conducted using high-purity ($\sim$99 percent) tritium, gas-filled glass capsules in inertial confinement fusion implosions. In these experiments, which were conducted at both the NIF and the OMEGA laser facilities, spectral measurements of the TT neutrons were carried out using two well-established instruments: the neutron-time-of-flight (nTOF) and the magnet-based Magnetic Recoil Spectrometer (MRS). The resolutions of these systems were improved significantly for the nTOF facility by using a crystal with much faster decay time and for the MRS by using a thinner, more uniform CD$_{2}$ recoil foil. At OMEGA, charged particle energy spectra were also measured using a magnetic charged particle spectrometer and the Thompson Parabola Ion Energy spectrometer. These measurements at reactant central-mass energies in the range of 10-30 keV can be used to study the TT reaction mechanism near astrophysical energies. This work was reported at the 2013 APS April meeting, where we used basic R-matrix line shapes. Since then we have updated and improved the fitting method by including the proper quantum interferences from fermion symmetry and decay channels [1]. The implications of these effects on our understanding of the spectrum also will be discussed. \\[4pt] [1] D. B. Sayre \textit{et al}., Phys. Rev. Lett. 111, 052501 (2013). [Preview Abstract] |
Saturday, April 5, 2014 1:42PM - 1:54PM |
C7.00002: ABSTRACT WITHDRAWN |
Saturday, April 5, 2014 1:54PM - 2:06PM |
C7.00003: The $^{124}$Xe(n,$\gamma $)$^{125}$Xe and $^{124}$Xe(n,2n)$^{123}$Xe Reactions and NIF Megha Bhike, Werner Tornow, Nurin Ludin Measurements of the neutron capture reaction $^{124}$Xe(n,$\gamma $)$^{125}$Xe have been performed at TUNL in the 0.4 to 14.8 MeV energy range. In addition, the $^{124}$Xe(n,2n)$^{123}$Xe reaction has been studied between threshold and 14.8 MeV. The results of these measurements provide sensitive diagnostic tools for investigating properties of the inertial confinement fusion plasmas at the National Ignition Facility. Being a p-process nucleus, the neutron capture cross section of $^{124}$Xe is also of interest for nuclear astrophysics. Preliminary results for both reactions are given. [Preview Abstract] |
Saturday, April 5, 2014 2:06PM - 2:18PM |
C7.00004: Cross section measurements for $\gamma$-rays emitted in $^{103}$Rh($n, x n y p z a \gamma$) reactions N. Fotiades, M. Devlin, R.O. Nelson, T. Kawano Although rhodium is a useful radiochemical diagnostic of integrated neutron fluence, no thorough study of the $\gamma$ rays emitted in fast neutron-induced reactions on the one-and-only stable rhodium isotope has been performed. Absolute partial cross sections for production of discrete $\gamma$-rays using $^{103}$Rh($n, x n y p z \alpha \gamma$) reactions with $x \leq 7$ and $y,z \leq 1$ in a total of 15 reaction channels were measured in the present work. The data were taken using the GEANIE spectrometer comprised of 26 high-purity Ge detectors with 20 BGO escape-suppression shields. The broad-spectrum pulsed neutron beam of the Los Alamos Neutron Science Center's (LANSCE) WNR facility provided neutrons in the energy range from 0.2 to 300~MeV. The time-of-flight technique was used to determine the incident neutron energies. Partial $\gamma$-ray cross sections have been measured for a total of 140 transitions and for neutron energies 0.8~MeV$< E_{n} <$300~MeV. An estimate of the population of isomers in the ($n,n^{\prime}$), ($n,2n$) and ($n,3n$) channels was attempted. Theoretical calculations up to $E_{n} = 20$~MeV from the GNASH reaction model are compared to the experimental results. [Preview Abstract] |
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