Impact of alternative transmission coeffcient parameterizations on Hauser-Feshbach theory

Brown, David A.; Nobre, G. P. A.; Herman, M. W.

doi:10.1103/PhysRevC.98.024616

Impact of alternative transmission coeffcient parameterizations on Hauser-Feshbach theory

Journal Article · Tue Aug 21 00:00:00 EDT 2018 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.98.024616· OSTI ID:1460713

Brown, David A. ^[1]; Nobre, G. P. A. ^[1]; Herman, M. W. ^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States)

Here, we investigate different formulations of the transmission coefficient T_c, including the form implied by Moldauer’s “sum rule for resonance reactions” and the Moldauer-Simonius form. Within these different formulations, we compute the neutron transmission coefficients in the resolved and unresolved resonance regions, allowing a direct comparison with the transmission coefficients computed using an optical model potential. For nuclei for which there are no measured resonances, these approaches allow one to predict the average neutron resonance parameters directly from the optical model and level densities. Some of the approaches are valid in both the strong and weak coupling limits (i.e., any value of the average width and mean level spacing). Finally, both the Moldauer-Simonius and Moldauer’s Sum Rule forms approaches suggest that superradiance, that is, the quantum chaotic enhancement of certain channels, may be a common phenomena in nuclear collisions. Our results suggest why superradiance has been previously overlooked. We apply our approach to neutron reactions on the closed shell ⁹⁰Zr nucleus and the mid-shell ¹⁹⁷Au nucleus.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: AC02-98CH10886; SC0012704

OSTI ID:: 1460713

Alternate ID(s):: OSTI ID: 1465612

Report Number(s):: BNL--207837-2018-JAAM

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 2 Vol. 98; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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