Abstract
Partial -ray production cross sections and the total radiative thermal-neutron capture cross section for the reaction were measured using the Prompt Gamma Activation Analysis facility at the Budapest Research Reactor with an enriched target. The cross sections were standardized using well-known cross sections from irradiation of a stoichiometric target. The resulting cross sections for transitions feeding the ground state from low-lying levels below a cutoff energy of were combined with a modeled probability of ground-state feeding from levels above to arrive at a total cross section of for radiative thermal-neutron capture on . A comparison of modeled discrete-level populations with measured transition intensities led to proposed revisions for seven tentative spin-parity assignments in the adopted level scheme for . Additionally, 102 primary rays were measured, including 50 previously unknown. A neutron-separation energy of was determined from a global least-squares fit of the measured -ray energies to the known decay scheme. The total capture cross section and separation energy results are comparable to earlier measurements of these values.
2 More- Received 28 March 2016
DOI:https://doi.org/10.1103/PhysRevC.93.054319
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