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 G1: Nuclear Physics III |
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Chair: Mohammad Ahmed, North Carolina Central University/TUNL Room: Riverview Plaza Hotel Bon Secour Bay Ballroom I |
Friday, November 20, 2015 11:00AM - 11:36AM |
G1.00001: Sub-barrier Photofission and Beam Diagnostics at HI$\gamma$S Invited Speaker: Jack Silano The High Intensity $\gamma$-ray Source (HI$\gamma$S) located at the Triangle Universities Nuclear Laboratory produces quasi-monoenergetic, 100\% polarized $\gamma$-ray beams in the energy range of 2 to 100 MeV suitable for wide variety of experimental investigations in areas such as nuclear astrophysics, nuclear structure, few body physics and hadronic parity violation. Earlier this year an experiment was performed to measure sub-barrier photofission of $^{232}$Th and $^{238}$U with linearly polarized $\gamma$-ray beams. By detecting prompt fission neutrons, the neutron multiplicities, neutron angular distributions and photofission cross sections can be determined. A crucial part of any experiment at HI$\gamma$S is a thorough characterization of the $\gamma$-ray beam. This presentation will describe a typical experiment at HI$\gamma$S from the perspective of a graduate student user. The discussion will cover various systems available to experimenters for monitoring the flux, energy resolution and alignment of the $\gamma$-ray beam. Additionally a recent upgrade to one of the neutron detectors, a high efficiency $\sim$4$\pi$ array of $^3$He proportional counters, will be discussed. [Preview Abstract] |
Friday, November 20, 2015 11:36AM - 12:12PM |
G1.00002: Development of an Experiment to Measure $a_{nn}$ Using $^3H(\gamma,p)nn$ at the Triangle Universities Nuclear Laboratory Invited Speaker: Forrest Friesen An experiment for determining the $^1$S$_0$ neutron-neutron (nn) scattering length ($a_{nn}$) with an accuracy of $\pm$1 fm from measurements of three-body photodisintegration of the triton is under development at TUNL. This experiment will provide the first data for the proton energy spectrum in this reaction. A linearly polarized 15-MeV gamma-ray beam from the High Intensity Gamma-ray Source (HI$\gamma$S) is incident on tritium gas contained in thin-walled cells. A collimator system followed by thin scintillator and silicon detectors identify and select charged particles in the angular region of maximum sensitivity. Outgoing neutrons and protons are detected in coincidence, allowing for kinematic cuts to better select the nn final state interaction. Considerations relevant to the tritium target system will be discussed. The experiment will be commissioned with $^3He$, which will provide data to aid in assessment of ab initio 3N calculations. Results from a GEANT4 simulation of the apparatus will also be presented. [Preview Abstract] |
Friday, November 20, 2015 12:12PM - 12:48PM |
G1.00003: Overview of the Fermilab Mu2e Experiment Invited Speaker: Charles Jenkins The Mu2e Experiment, at the Fermi National Accelerator Laboratory, will measure the ratio of the decay of the coherent, neutrinoless conversion of stopped muons into electrons in the field of nucleus to the muon nuclear capture rate. This decay is possible at an undetectable level within the Standard Model; however, several physics beyond the Standard Model scenarios predict very small but observable rates. The sensitivity of this experiment is a factor of 10$^{\mathrm{4}}$ improvement over the current limit. The experiment compliments and extends current search for muon to electron$+$gamma at MEG and new physics searches at the LHC. This experiment is in the approval stages and is expected to start data collection in 2021. An overview of the Mu2e experiment will be presented. [Preview Abstract] |
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