Bulletin of the American Physical Society
2021 Fall Meeting of the APS Division of Nuclear Physics
Volume 66, Number 8
Monday–Thursday, October 11–14, 2021; Virtual; Eastern Daylight Time
Session MJ: Applications of Nuclear Physics I |
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Chair: Shamsu Basunia, LBNL Room: Tremont |
Wednesday, October 13, 2021 4:00PM - 4:12PM |
MJ.00001: Accelerator Mass Spectrometry with 53Mn at the University of Notre Dame Thomas L Bailey, Lauren K Callahan, Adam M Clark, Philippe A Collon, Austin D Nelson, Michael Paul, Anton Wallner Accelerator Mass Spectrometry (AMS) utilizes various ion counting techniques to measure ultra-low concentrations of long lived radioisotopes. At the University of Notre Dame’s Nuclear Science Laboratory (NSL), an FN Tandem accelerator is used in conjunction with a Browne-Buechner Spectrograph operated in gas-filled mode and various detection systems to perform AMS. A new split-anode ionization chamber, MONICA, went through multiple commissioning runs at the NSL. As part of these commissioning runs, standard material (53Mn/55Mn = 2.53*10-10) and independently measured samples for 53Mn were analyzed for the first time at the NSL. 53Mn is an isotope of interest in AMS as it can be used as a geological chronometer and be used to study the deposition of interstellar matter on Earth. The low level detection of this isotope is challenging due to its stable isobar of 53Cr and various suppression techniques are required to separate them. Analysis of the results and experimental techniques will be presented for this report. |
Wednesday, October 13, 2021 4:12PM - 4:24PM |
MJ.00002: Initial Tests of Accelerator Mass Spectrometry with the Argonne Gas Filled Analyzer (AGFA) and the commissioning of the MONICA detector Lauren K Callahan, Philippe Collon, Michael D Paul, Melina L. Avila M Coronado, Birger B. L Back, Thomas L. A Bailey, Adam M. Clark, Brad J. B DiGiovine, Chenglie H Jiang, Yoav J Kashiv, Austin D. P Nelson, Richard C. Pardo, David H. C Potterveld, K.E. H Rehm, Robert H. C Scott, John P. Greene, Dariusz Seweryniak, Richard C. L Vondrasek, Anton E Wallner
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Wednesday, October 13, 2021 4:24PM - 4:36PM |
MJ.00003: Actinide Accelerator Mass Spectrometry Development for Environmental Sampling and Neutron Capture Cross Section Measurements Adam M Clark, Thomas L Bailey, Lauren K Callahan, Austin D Nelson, Philippe A Collon, Michael Paul The detection of anthropogenic actinide isotopes in the environment has served a critical role in the field of Nuclear Forensics. For particularly small samples, Accelerator Mass Spectrometry (AMS) provides the sensitivity required for the detection of long-lived minor actinides. Specifically, natural ore samples with concentrations of 236U/238U on the order of 10-11 have been measured in some facilities. Progress on the implementation of a detection system capable of high-sensitivity actinide measurements has been made at the Nuclear Science Laboratory at the University of Notre Dame. Details highlighting the key developments towards a reliable measurement technique, as well as the projected detector system limitations, will be presented. |
Wednesday, October 13, 2021 4:36PM - 4:48PM |
MJ.00004: A novel technique for the production of robust actinide targets Stefania Dede, Khachatur Manukyan, Ashabari Majumdar, Wanpeng Tan, Gregory Christian, Aaron J Couture, Ani Aprahamian The availability and production of targets for experiments in either fundamental or applied studies in nuclear science are critical to the success of a given measurement. Targetry and methods have essentially remained unchanged for more than 5 or 6 decades. Also, making targets with rare and often prohibitively expensive materials has not been an option due to the low efficiency of the available methods. This is especially true for rare and sometimes radioactive actinide materials. |
Wednesday, October 13, 2021 4:48PM - 5:00PM |
MJ.00005: Current capabilities in astatine-211 production at Texas A&M University Lauren McIntosh, Jonathan Burns, Kylie Lofton, Laura A McCann, Steven Schultz, Gabriel Tabacaru, Evgeny E Tereshatov, Sherry J Yennello Alpha emitting radionuclides with medically relevant half-lives are of renewed interest to the medical community for treating tumors and other diseases because they deposit large amounts of energy close to the location of the radioisotope. Some could be used for “theranostic” purposes, where both therapy and diagnostic imaging are supplied by the same isotope or different isotopes of the same element. While some of these isotopes are available via low energy protons or reactor routes, some of the most promising isotopes are inaccessible via these conventional routes. One such isotope of interest is astatine-211, an alpha-emitter with a 7.2h half-life. The K150 at the Cyclotron Institute of Texas A&M is capable of generating reasonable intensities of alpha particles to produce this isotope. A program is being developed to explore production of alpha emitters with medically relevant half-lives at Texas A&M. The current state of 211At production using beams from the K150 and future directions will be discussed. |
Wednesday, October 13, 2021 5:00PM - 5:12PM |
MJ.00006: In-Cathode Activations for 41Ca Production Cross Section Measurements Austin D Nelson, Thomas L Bailey, Lauren K Callahan, Adam M Clark, Philippe A Collon
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Wednesday, October 13, 2021 5:12PM - 5:24PM |
MJ.00007: Development of InSb Low-Energy Threshold Detector for Dark Matter Searches Mathbar S Raut, Sanjay Bhattarai, Hao Mei, Dongming Mei At the University of South Dakota, we have been successfully growing Ge single crystals for a decade by using the Czochralski method. These Ge detector-grade single crystals are fabricated into radiation detectors used in many research and application areas such as rare event physics. However, a new semiconductor is still necessary especially in high-resolution X-rays and gamma-rays spectroscopy with a low-energy threshold. The most promising binary semiconductor is Indium Antimonide (InSb), which can be developed as a future ultra-high-resolution radiation detector due to its very small bandgap of 0.165 eV and large electron mobility of 78000 cm2V-1s-1. This small bandgap could provide even better energy resolution and peak-to-Compton ratios than Ge does. |
Wednesday, October 13, 2021 5:24PM - 5:36PM |
MJ.00008: Fitting the cross-section probability tables with symbolic regression techniques Matteo Vorabbi, David Brown, Marcus McLaurin Below 1 MeV incident energy, cross sections for neutrons interacting with nuclei show significant fluctuations that are not predictable. The current methodology used to describe such behavior and construct the probability table of the cross section is based on the extrapolation of the average resonance widths and average resonance spacings from the resonance region and generate Monte Carlo realizations of resonance ladders. We then use these realizations to construct the probability tables. Although this is a standard and widely used technique, it is computationally very expensive. Our goal is to produce accurate analytical fits of these tables adopting a machine learning approach. For this project we generate the zero-temperature probability distribution function for specific reactants of interest and use symbolic regression techniques to produce an analytical fit of the probabilities that can be used in real life applications with a considerable speed up of the computational time. |
Wednesday, October 13, 2021 5:36PM - 5:48PM |
MJ.00009: Determining Beta Feeding Intensities and Level Schemes of Tc-106 and Mo-106 Using The Modular Total Absorption Spectrometer Michael Cooper, Robert Grzywacz, Peng Shuai, Bertis C Rasco, Krzysztof Rykaczewski Nuclear data for fission fragment isotopes is an area of research that is extremely important for many industrial and academic fields. When fission fragments decay, they can result in nuclei with many high energy levels being fed, each with a relatively low intensity. This is called the pandemonium effect. High precision spectroscopy measurements will typically vastly underestimate the beta feeding intensities to the high energy levels, and overestimate the lower energy levels. The solution to this is Total Absorption Spectroscopy (TAS). My research regarding Tc-106 and Mo-106 has data obtained using the Modular Total Absorption Spectrometer (MTAS) at Argonne National Laboratory's CARIBU source. MTAS is a segmented NaI detector with over 80% efficiency, allowing for the observance of high energy levels in nuclei. By utilizing the modular segmented NaI crystals, in combination with extremely efficient beta gating via silicon strips, it is possible to determine both the beta feeding intensities and the gamma decay paths from nuclei, which can not easily be done with HPGe detectors. This data can then be fed into physics codes such as MCNP and GEANT4, resulting in far better simulation quality for both the nuclear physics and engineering communities. |
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