Bulletin of the American Physical Society
2007 Annual Meeting of the Division of Nuclear Physics
Volume 52, Number 10
Wednesday–Saturday, October 10–13, 2007; Newport News, Virginia
Session BC: Mini-Symposium on the CEU 10th Anniversary |
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Chair: W.F. Rogers, Westmont College Room: Newport News Marriott at City Center Pearl Salon I |
Thursday, October 11, 2007 2:00PM - 2:36PM |
BC.00001: A Research Journey from Then to Now: Investigation of $^{100,101}$Pd Invited Speaker: Structural evolution is traditionally described as a function of nucleon number. Instead, changes in structure as a function of angular momentum can be identified using the E-Gamma Over Spin (E-GOS) method. Excited states in $^{100,101}$Pd were populated in an experiment performed at the Wright Nuclear Structure Laboratory at Yale University following the reaction $^{12}$C + $^{92}$Zr $\rightarrow ^{100,101}$Pd + $x$n. Data were collected at four beam energies: 66 MeV, 68 MeV, 70 MeV, and 75 MeV. Eight HPGe detectors in the SPEEDY array detected gamma ray decay from high spin states. I will interpret results within the E-GOS framework discuss the impact of the CEU program on my own research path. This work has been supported by U.S. DOE under grant number DE-FG02-91ER40609. [Preview Abstract] |
Thursday, October 11, 2007 2:36PM - 2:54PM |
BC.00002: Discovering the Questions and Challenges of Neutrino Physics Noah Oblath Participation in the CEU program exposes undergraduate students to the wide variety of fascinating questions being asked and studied in the field of nuclear physics. As an undergraduate I attended three consecutive DNP Fall Meetings through the CEU program, presenting the research I performed during three summers working on the Sudbury Neutrino Observatory (SNO). The opportunities to present my research and hear talks by other people in the field inspired me to continue in neutrino research, working on the same experiment, as a graduate student. I loved learning about the fundamental questions SNO was trying to answer, as well as the day-to-day aspects of the research. Continuing to work on the SNO, I have had the opportunity to work on a wide variety of projects, including detailed Monte Carlo simulations of the Neutral-Current Detection Array data. I have enjoyed the challenges of analyzing the latest solar neutrino data, and the subtleties involved in reaching the few-percent level of accuracy in neutrino experiments. [Preview Abstract] |
Thursday, October 11, 2007 2:54PM - 3:12PM |
BC.00003: From a CEU '98er: 9 years and 5 research projects later Christine Aidala Since my first research experience in 1996 working in low-energy nuclear structure, the results of which were presented at the original DNP CEU poster session in Santa Fe in 1998, subsequent projects led me to weave my way through various energies and collision systems in nuclear and particle physics. Through the course of the broad exposure to research that I have been fortunate enough to experience, I have found a niche for myself in the study of nucleon spin structure. I originally got involved in the field in 1998-99 through my undergraduate senior project on studies for polarizing the proton beam at HERA in Hamburg, Germany. After a foray into particle physics followed by an unanticipated diversion from research, teaching music and English abroad, fate--and some kind individuals--would give me the opportunity to return both to physics and specifically to nucleon structure in 2001 as part of the PHENIX experiment at the Relativistic Heavy Ion Collider. Six years into my research on proton spin structure as a member of the PHENIX Collaboration, I will discuss where I am today and the non-linear path that brought me here. [Preview Abstract] |
Thursday, October 11, 2007 3:12PM - 3:30PM |
BC.00004: The $^{17}$O(p,$\alpha$)$^{14}$N reaction measured using a novel technique B.H. Moazen, J.C. Blackmon, D.W. Bardayan, K.Y. Chae, K. Chipps, C.P. Domizioli, R. Fitzgerald, U. Greife, W.R. Hix, K.L. Jones, R.L. Kozub, E.J. Lingerfelt, R.J. Livesay, C.D. Nesaraja, S.D. Pain, L.F. Roberts, J.F. Shriner Jr., M.S. Smith, J.S. Thomas We developed a new approach for measuring (p,$\alpha$) reactions and applied it to measure the energy and strength of the 183 keV resonance in $^{17}$O(p,$\alpha$)$^ {14}$N that was recently reported to significantly increase the reaction rate in novae. A beam of $^{17}$O from the Holifield Radioactive Ion Beam Facility [ORNL] tandem accelerator bombarded hydrogen gas, which filled a differentially pumped scattering chamber at pressures up to 4 Torr. Reaction products were detected in coincidence and the vertex of the reaction was determined from the relative kinematics of the two products. Nova simulations show the new $^{17}$O(p,$\alpha$)$^{14}$N reaction rate significantly decreases $^{18}$F production in low mass ONeMg nova but affects more energetic novae less. Results and astrophysical implications will be presented as well as comments regarding my past CEU participation. ORNL is managed by UT-Battelle for the US DOE. [Preview Abstract] |
Thursday, October 11, 2007 3:30PM - 3:48PM |
BC.00005: The study of $^{158}$Gd from CEU to Present S.R. Lesher The identification of 13 0$^{+}$ states by the $^{160}$Gd(p,t)$^{158}$Gd reaction was presented as a poster at the 1998 CEU session. Since this identification, a subsequent $^{158}$Gd(n,n$^{\prime}\gamma$) experiment was performed at the University of Kentucky and $\gamma$ rays associated with these levels were assigned. These assignments allowed lifetimes of many levels of varying spins to be determined and transition probabilities to be calculated. Follow one nucleus and one CEU student through a survey of the experimental results to the most current interpretations of the vibrational structure of the deformed $^{158}$Gd. [Preview Abstract] |
Thursday, October 11, 2007 3:48PM - 4:06PM |
BC.00006: New mass measurements of neutron rich nuclides at the NSCL. Alfredo Estrade, Milan Matos, Matthew Amthor, Daniel Bazin, Ana Becerril, Thom Elliot, Alexandra Gade, Daniel Galaviz, Giuseppe Lorusso, Jorge Pereira, Mauricio Portillo, Andrew Rogers, Hendrik Schatz, Dan Shapira, Ed Smith, Andreas Stolz, Mark Wallace A mass measurement of exotic isotopes in the region of 68Fe has been performed at the NSCL using the time-of-flight technique recently established. Experimental knowledge of the mass of very neutron rich nuclides is an important input for astrophysical applications, such as nucleosynthesis during the r-process and the evolution of matter in the crust of an accreting neutron star, where present calculations are mostly limited to using theoretical mass extrapolations. We present the details of the experimental set up, as well as preliminary results. [Preview Abstract] |
Thursday, October 11, 2007 4:06PM - 4:24PM |
BC.00007: Double-Beta Decay at TUNL Mary Kidd Studying double-beta decay at Triangle Universities Nuclear Laboratory (TUNL) is perhaps one of the most promising ways to pinpoint the neutrino mass. What they do not mention is that to study double-beta decay, you probably have to become a certified miner, and if you have a fear of goats, you should stay away. In this talk, I will tell you some of my experiences as a TUNL graduate student, and how I am now nearly qualified for a job in the mining industry. [Preview Abstract] |
Thursday, October 11, 2007 4:24PM - 4:42PM |
BC.00008: Selective Suppression of Sulfur by Photodetachment in a RF Quadrupole Ion Cooler Thomas Lewis, Alfredo Galindo-Uribarri, Charles Havener, Yuan Liu A method for selectively suppressing contaminants in negative ion beams through collisional cooling and photodetachment has been developed at the Holifield Radioactive Ion Beam Facility. Due to possible applications in Accelerator Mass Spectrometry, the potential for purifying a 36Cl beam of 36S contamination using this method was explored using stable S- and Cl- ions and a pulsed Nd:YLF laser at 527 nm. The laser's photon energy (2.352 eV) is above sulfur's electron affinity (2.077 eV) and below chlorine's (3.617 eV), allowing selective suppression of S. The laser beam was directed along the experiment's beam line and through a radio-frequency quadrupole ion cooler. Negative 32S and 35Cl ions produced by a Cs sputter ion source were focused into the ion cooler where they were slowed by collisions with He buffer gas; this increased interaction time of the negative ion beam and the laser beam. Suppression of S- by a factor of 3000 was obtained with about 2.5 W average laser power in the cooler while no reduction in Cl- current was observed. [Preview Abstract] |
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