Bulletin of the American Physical Society
Joint Fall 2013 Meeting of the Texas Sections of the APS, AAPT, and Zone 13 of the SPS
Volume 58, Number 10
Thursday–Saturday, October 10–12, 2013; Brownsville, Texas
Session C5: Nuclear Physics |
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Chair: Michael Sadler, Abilene Christian University Room: UBCB 2.106 |
Friday, October 11, 2013 2:00PM - 2:12PM |
C5.00001: Semi empirical formulae for nuclear single particle energies Abdulaziz Al-Mogeeth, M.A.K. Lodhi The nonlocal potential is a crucial property for finite nucleus calculations. Under the effect of a nonlocal potential, the energy of a particle at the point \textbf{r} depends on the wave function at \textbf{r} and the wave function at the other point \textbf{r'} which is a neighbor of point \textbf{r}. The Morse function has been used to represent the nucleon-nucleus nonlocal potential to generate single particle energies in nuclei. From these data of single particle energies of neutrons and protons thus generated semi empirical formulae have been constructed for the entire periodic table. These formulae may not give the exact values for each and every single particle state but provide a general trend giving broad features like magic numbers. These formulas yield level crossing at the right place, which will be illustrated in cases of s-d and p-f levels. [Preview Abstract] |
Friday, October 11, 2013 2:12PM - 2:24PM |
C5.00002: Nuclear spin polarization of $^{37,41}K$ by optical pumping Benjamin Fenker Precision measurements of observables in nuclear $\beta$-decay are capable of imposing meaningful constraints on physics beyond the standard model complementary to those obtained at high-energy collider experiments. In particular, measuring the $\beta$-asymmetry parameter ($A_{\beta}$) in the $\beta^{+}$-decay of spin-polarized $^{37}K$ constrains the possible admixture of a hypothetical $V+A$ current in the weak interaction. At TRINAT (TRIUMF's Neutral Atom Trap), atoms are confined and cooled in a magneto-optical trap and highly spin-polarized by optical pumping. I will show that we have determined the average nuclear polarization of optically pumped $^{41}K$ to be $\left\langle P\right\rangle =98.8(6)\%$. Furthermore, I will present a comparison of optical pumping models as it pertains to our application, demonstrating that a quantum mechanical approach based on the density matrix formalism is necessary to accurately account for the various depolarizing mechanisms. [Preview Abstract] |
Friday, October 11, 2013 2:24PM - 2:36PM |
C5.00003: Improvement of Environmental Monitoring for the SeaQuest Detector Elizabeth Carlisle SeaQuest(Fermilab E906), uses the 120 GeV accelerator at Fermilab to collide protons with a fixed target. The primary targets are liquid hydrogen and liquid deuterium. SeaQuest will study the anti-down to anti-up quark asymmetry known to exist in the sea of gluons, quarks, and antiquarks in the proton and neutron. Recording environmental conditions is important, since detector performance and response can vary with conditions such as humidity, temperature and pressure, which vary over time. Due to the size of the detector hall, there are vertical temperature gradients, so temperature must be measured at varying heights. Another important need is to monitor temperature in electronics racks to know when they are overheating. The requirements of the equipment to be used were that it had to be ethernet based and rely only on non-proprietory software. Also, in order to be used during a data run, it has to be fast enough to be recorded in the 55 second gaps between proton spills. This presentation will focus on our solution for measuring environmental conditions, as well as how the time it took to read out data was dropped from 17.5 seconds to 6.9 seconds. [Preview Abstract] |
Friday, October 11, 2013 2:36PM - 2:48PM |
C5.00004: Studies of neutron scattering off $^{54}$Fe with monoenergetic neutrons at 3 and 4 MeV Samuel Henderson, Leslie Sidwell, Sally Hicks, Jeffrey Vanhoy, Evaristo Garza, Joshua Steves, Steven Yates, Marcus McElistream, Erin Peters, Benjamin Crider, Tim Ross, Francisco Prados-Est\'evez Accurate and precise neutron scattering data from $^{54}$Fe and other structural materials in the fast neutron energy region are essential for the optimization of current and future fission reactors. Neutron scattering and absorption by Fe affects the ideal operating parameters for the nuclear fission process and also affects the overall efficiency of the nuclear reactor. While neutron elastic crosssections for $^{54}$Fe at incident neutron energies between 3 and 4 MeV have been previously measured, the previous experiments tended towards larger error in the elastic, and there is a significant dearth of experimental data for the inelastic states. Neutron elastic and inelastic differential scattering crosssections of $^{54}$Fe have been measured at the University of Kentucky Accelerator Laboratory at the fast neutron energies of E$_{n}=$3 MeV and 4 MeV. Results from our measurements and comparisons to evaluated cross sections from the National Nuclear Data Center will be presented. [Preview Abstract] |
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