The n + 147Sm study with DICER at LANSCE
ORAL
Abstract
147Sm is of vital interest to nuclear astrophysics since the 147Sm/143Nd pair is used for radiometric dating with 147Sm decaying by 𝛼 particle emission to 143Nd. In addition to the astrophysical interest in 147Sm as a radiometric dating tool, the 147Sm+n reactions have been used as a testing ground for resonances in neutron-induced reactions. Past measurements of these reactions including a 147Sm(n,𝛾) experiment with the DANCE (Detector for Advances Neutron Capture Experiments) at LANSCE (Los Alamos Neutron Science CEnter) have found evidence of non-statistical behavior. This is a cause of concern since, for many heavier nuclei, statistical models are used to describe the reaction cross sections in nuclear astrophysics and in other scenarios such as nuclear reactors, weapon physics and medical applications. Based on the assessment, total n-capture 147Sm cross-section measurements are needed from meV energies and extending through the resonance region. The DANCE and DICER (Device for Indirect Capture Experiments on Radionuclides) instruments at LANSCE have been used to measure the spin-separated neutron-capture cross section and the neutron transmission, respectively, using the time-of-flight technique. A combined R-Matrix analysis has been performed to extract resonance parameters. Data have been collected and analyzed in the meV - keV range for transmission.
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Presenters
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Ryan Amberger
Texas A&M University College Station
Authors
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Ryan Amberger
Texas A&M University College Station
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Athanasios Stamatopoulos
Los Alamos National Laboratory
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Paul Edward Koehler
Los Alamos National Laboratory (LANL)
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Sotirios Chasapoglou
Los Alamos National Laboratory
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Aaron J Couture
Los Alamos National Laboratory (LANL)
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Todd Allen Bredeweg
Los Alamos National Laboratory (LANL)
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Brad J DiGiovine
Los Alamos National Laboratory
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Scott Essenmacher
Los Alamos National Laboratory
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Rene Reifarth
Los Alamos National Laboratory (LANL)
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Josef Svoboda
Los Alamos National Laboratory (LANL)
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John Leonard Ullmann
Los Alamos National Laboratory (LANL)
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John M O'Donnell
Los Alamos National Laboratory (LANL), Los Alamos National Laboratory