Bulletin of the American Physical Society
Annual Meeting of the Four Corners Section of the APS
Volume 58, Number 12
Friday–Saturday, October 18–19, 2013; Denver, Colorado
Session D4: Nuclear Physics |
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Chair: Siu Au Lee, Colorado State University Room: 287 |
Friday, October 18, 2013 2:00PM - 2:12PM |
D4.00001: Using the $^{11}$Be(p, d)$^{10}$Be$^*$ transfer reaction at 110 MeV at TRIUMF-ISAC II to study halo features K. Kuhn, R. Braid, F. Sarazin, D. Smalley, U. Hager, S. Ilyushkin, P. O'Malley, M. Alvarez, J. Gomez, C. Andreoiu, P.C. Bender, G. Hackman, C. Unsworth, Z. Wang, W.N. Catford, C.Aa. Diget, A. DiPietro, P. Figuera, T.E. Drake, E. Nacher, A. Perea, O. Tengblad, C.E. Svensson To simultaneously study the halo wavefunction of the $^{11}$Be ground-state, and also possible excited halo states in $^{10}$Be, the $^{11}$Be(p, d)$^{10}$Be$^*$ reaction was studied at 10 MeV/nucleon at TRIUMF-ISAC II. This one-neutron transfer reaction allows the study of the single-particle states in $^{11}$Be and in $^{10}$Be by removing either the halo neutron or a core neutron respectively. A compact silicon array along with the TRIUMF ISAC Gamma-Ray Escape-Suppressed Spectrometer (TIGRESS) was used to detect the outgoing deuteron in coincidence with gamma-rays to determine the final state of the $^{10}$Be nucleus. Results from the May 2013 experiment will be shown. [Preview Abstract] |
Friday, October 18, 2013 2:12PM - 2:24PM |
D4.00002: Improved neutron time of flight apparatus Alec Raymond, John Ellsworth Time-of-flight (ToF) facilities are useful for determining the energy spectra of neutrons from nuclear reactions. The ToF apparatus at Brigham Young University is used to support laboratory nuclear astrophysics research; products of both fission and fusion reactions are of particular interest. Reported here are improvements made to our apparatus. In the past, the gamma start pulse was detected with a 5'' x 5'' NaI(Tl) scintillator with a 10 dynode PMT. The current start detector uses a 5'' x 2'' EJ-200 plastic scintillator with a 14 dynode PMT. The plastic detector has improved timing resolution over the NaI(Tl) detector. Future plans include replacing our sealed Cf-252 source with a Cf fission chamber. We're anticipating using this facility to improve understanding of the fission process. [Preview Abstract] |
Friday, October 18, 2013 2:24PM - 2:36PM |
D4.00003: Monte Carlo simulations of VANDLE Sergey Ilyushkin, Frederick Sarazin, William Peters, Robert Grzywacz, Miguel Madurga, Stanley Paulauskas, Jolie Cizewski The Versatile Array of Neutron Detectors at Low Energy (VANDLE) is a plastic-scintillator array designed for various experimental setups including $\beta $-delayed neutron spectroscopy and (d,n) transfer reactions in inverse kinematics. The neutron energy is determined through the time-of-flight technique. The array has energy resolution of $\sim$120 keV @ 1 MeV and energy threshold of $\sim$100 keV. We have developed a Geant4 simulation of VANDLE to optimize array geometry for different types of experiments and test neutron scattering models provided by Geant4. A typical $\beta $-delayed neutron decay study involves coupling with $\gamma $ detectors to collect $\beta $-$\gamma $ coincidence information. The experimental assembly including VANDLE bars, $\beta $ plastic scintillators, HPGe detectors, along with the detector support structure was modeled to assist in the fine-tuning of the setup and give a detailed understanding of the array performance. The simulation was validated by comparing to available experimental data and could serve as an important guide for the design of future experiments. [Preview Abstract] |
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