Feeding of Rh and Ag isomers in fast-neutron-induced reactions

Fotiades, Nikolaos; Devlin, Matthew James; Nelson, Ronald Owen; Kawano, T.; Carroll, J. J.

doi:10.1103/PhysRevC.94.044608

Title: Feeding of Rh and Ag isomers in fast-neutron-induced reactions

Journal Article · Mon Oct 17 00:00:00 EDT 2016 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.94.044608· OSTI ID:1346842

^[1];

^[1]; Nelson, Ronald Owen ^[1]; Kawano, T. ^[1]; Carroll, J. J. ^[2]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
U.S. Army Research Lab., Adelphi, MD (United States)

In (n,n') reactions on stable Ir and Au isotopes in the mass A=190 region, the experimentally established feeding of the isomers relative to the feeding of the corresponding ground states increases with increasing neutron energy, up to the neutron energy where the (n,2n) reaction channel opens up, and then decreases. In order to check for similar behavior in the mass A=100 region, the feeding of isomers and ground states in fast-neutron-induced reactions on stable isotopes in this mass region was studied. This is of especial interest for Rh which can be used as a radiochemical detector. Here, excited states were studied using the (n,n'γ), (n,2nγ), and (n,3nγ) reactions on ¹⁰³Rh and ¹⁰⁹Ag. A germanium detector array for γ-ray detection and the broad-spectrum pulsed neutron source of the Los Alamos Neutron Science Center's Weapons Neutron Research facility were used for the measurement. The energy of the incident neutrons was determined using the time-of-flight technique. Absolute partial γ-ray cross sections were measured for 57 transitions feeding isomers and ground states in ^101,102,103Rh and ^107,108,109Ag. The feeding of the isomers was found to be very similar in the corresponding reaction channels and it is compared to the feeding determined for the ground states. In conclusion, the opening of reaction channels at higher neutron energies removes angular momentum from the residual nucleus and reduces the population of the higher-spin isomers relative to the feeding of the lower-spin ground states. Similar behavior was observed in the mass A=190 region in the feeding of higher-spin isomers, but the reverse behavior was observed in ¹⁷⁶Lu with a lower-spin isomer and a higher-spin ground state.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1346842

Alternate ID(s):: OSTI ID: 1329099

Report Number(s):: LA-UR-16-26892; PRVCAN; TRN: US1701373

Journal Information:: Physical Review C, Vol. 94, Issue 4; ISSN 2469-9985

Publisher:: APSCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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