Bulletin of the American Physical Society
APS April Meeting 2015
Volume 60, Number 4
Saturday–Tuesday, April 11–14, 2015; Baltimore, Maryland
Session R5: Instrumentation and Applications |
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Sponsoring Units: DNP Chair: Todd Averett, College of William and Mary Room: Key 1 |
Monday, April 13, 2015 10:45AM - 10:57AM |
R5.00001: Development of fast-release solid catchers for rare isotopes Jerry Nolen, John Greene, Jeffrey Elam, Anil Mane, Uma Sampathkumaran, Raymond Winter, David Hess, Mohammad Mushfiq, Daniel Stracener, Ingo Wiendenhoever Porous solid catchers of rare isotopes are being developed for use at high power heavy ion accelerator facilities such as RIKEN, FRIB, and RISP. Compact solid catchers are complementary to helium gas catchers for parasitic harvesting of rare isotopes in the in-flight separators. They are useful for short lived isotopes for basic nuclear physics research and longer-lived isotopes for off-line applications. Solid catchers can operate effectively with high intensity secondary beams, e.g. $\gg$ 1E10 atoms/s with release times as short as 10-100 milliseconds. A new method using a very sensitive and efficient RGA has been commissioned off-line at Argonne and is currently being shipped to Florida State University for in-beam measurements of the release curves using stable beams. The same porous solid catcher technology is also being evaluated for use in targets for the production of medical isotopes such as 211-At. [Preview Abstract] |
Monday, April 13, 2015 10:57AM - 11:09AM |
R5.00002: ABSTRACT WITHDRAWN |
Monday, April 13, 2015 11:09AM - 11:21AM |
R5.00003: Data Acquisition and Environmental Monitoring of the MAJORANA DEMONSTRATOR Samuel Meijer Low-background non-accelerator experiments have unique requirements for their data acquisition and environmental monitoring. Background signals can easily overwhelm the signals of interest, so events which could contribute to the background must be identified. There is a need to correlate events between detectors and environmental conditions, and data integrity must be maintained. Here, we describe several of the software and hardware techniques achieved by the \textsc{Majorana} Collaboration for the \textsc{Majorana Demonstrator}, such as using the Object-oriented Realtime Control and Acquisition (ORCA) software package. [Preview Abstract] |
Monday, April 13, 2015 11:21AM - 11:33AM |
R5.00004: Neutron-neutron angular correlations in spontaneous and neutron-induced fission Ramona Vogt, Jorgen Randrup For many years, the state of the art for treating fission in radiation transport codes has involved sampling from average distributions. However, such average fission models have limited interaction-by-interaction capabilities. Energy is not explicitly conserved and no correlations are available because all particles are emitted isotropically and independently. However, in a true fission event, the energies, momenta and multiplicities of emitted particles are correlated. Such correlations are interesting for many modern applications, including detecting small amounts of material and detector development. Event-by-event generation of complete fission events are particularly useful because it is possible to obtain the fission products as well as the prompt neutrons and photons emitted during the fission process, all with complete kinematic information. It is therefore possible to extract any desired correlation observables. Such codes, when included in broader Monte Carlo transport codes, like MCNP, can be made broadly available. We compare results from our fast event-by-event fission code FREYA (Fission Reaction Event Yield Algorithm) with available neutron-neutron angular correlation data and study the sensitivities of these observables to the model inputs. [Preview Abstract] |
Monday, April 13, 2015 11:33AM - 11:45AM |
R5.00005: Detection of fissionable materials in cargoes using monochromatic photon radiography Areg Danagoulian, Richard Lanza, Buckley O'Day The detection of Special Nuclear Materials (e.g. Pu and U) and nuclear devices in the commercial cargo traffic is one of the challenges posed by the threat of nuclear terrorism. Radiography and active interrogation of heavily loaded cargoes require $\sim 1-10 MeV$ photons for penetration. In a proof-of-concept system under development at MIT, the interrogating monochromatic photon beam is produced via a $^{11}B(d,n \gamma)^{12}C$ reaction. To achieve this, a boron target is used along with the 3MeV $d^{+}$ RFQ accelerator at MIT-Bates. The reactions results in the emission of very narrow 4.4MeV and 15.1MeV gammas lines. The photons, after traversing the cargo, are detected by an array of $NaI(Tl)$ detectors. A spectral analysis of the transmitted gammas allows to independently determine the areal density and the atomic number (Z) of the cargo. The proposed approach could revolutionize cargo inspection, which, in its current fielded form has to rely on simple but high dose bremsstrahlung sources. Use of monochromatic sources would significantly reduce the necessary dose and allow for better determination of the cargo's atomic number. The general methodology will be described and the preliminary results from the proof-of-concept system will be presented and discussed. [Preview Abstract] |
Monday, April 13, 2015 11:45AM - 11:57AM |
R5.00006: Electromagnetic Near Field Measurements of Two Critical Assemblies Jeffrey Goettee, Tim Goorley, Douglas Mayo, William Myers, Joetta Goda, Frank Sage Preliminary measurements of the fast metal nuclear reactors at the National Criticality Experiments Research Center (NCERC) and at White Sands Missile Range (WSMR) within the past year characterize the very near field environment of these critical assemblies. Both reactors are fast, highly enriched uranium metal reactors and can be operated in a burst mode above prompt supercritical. Initial measurements of the electric and the magnetic fields within the reactor cell are consistent between the two facilities, and begin to describe the dependance on distance and polarization as might be assumed from initial Monte Carlo modelling of these facilities. The amplitude and time variation of the electric and magnetic fields are consistent with burst time scales. The polarization is consistent with the geometry of the source and with Compton scattering from fission gammas as the dominant ionization mechanism. An overview of the two fast neutron sources and the excursion dynamics, the experimental details, and summary of the modelling calculations will be provided as background. [Preview Abstract] |
Monday, April 13, 2015 11:57AM - 12:09PM |
R5.00007: Laser Forced Nuclear Fission as a Spectroscopy tool Richard Kriske Although it is widely understood that Heavy Isotopes of Hydrogen can be fused using Lasers (Ultraviolet Lasers, at the National Ignition Facility), it is not commonly known that Uranium and radioactive substances can be forced into Nuclear Fission using Lasers as well. It shows up in some footnotes in the literature surrounding the National Ignition Facility. This author would like to propose that it has a use in the search for Dark Matter and the ferreting out of possible alternative descriptions of Nuclear Processes and the search for the Graviton. This author has previously proposed that there may be two dimensions of time, one being the Clock time that we associate with General Relativity and the other being a Configuration time that we normally associated with Electron Spin. A powerful X-ray laser could be used to probe the composition of the farthest members of our Solar system, such as the composition of Pluto. Experiments should be able to determine if there is exotic matter present in the outer reaches of the Solar system. Further the Lasers should have enough power to more precisely analyze Nuclear Spin in an attempt to determine if it is really related to Classical Angular Momentum. It may yield a more comprehensive theory linking Classical to Quantum Theory. [Preview Abstract] |
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