Extended optical model for fission

Sin, M.; Capote, R.; Herman, M. W.; Trkov, A.

doi:10.1103/PhysRevC.93.034605

Title: Extended optical model for fission

Journal Article · Mon Mar 07 00:00:00 EST 2016 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.93.034605· OSTI ID:1245393

Sin, M. ^[1]; Capote, R. ^[2]; Herman, M. W. ^[3]; Trkov, A. ^[2]

Univ. of Bucharest, Bucharest-Magurele (Romania)
International Atomic Energy Agency, Vienna (Austria)
Brookhaven National Lab. (BNL), Upton, NY (United States)

A comprehensive formalism to calculate fission cross sections based on the extension of the optical model for fission is presented. It can be used for description of nuclear reactions on actinides featuring multi-humped fission barriers with partial absorption in the wells and direct transmission through discrete and continuum fission channels. The formalism describes the gross fluctuations observed in the fission probability due to vibrational resonances, and can be easily implemented in existing statistical reaction model codes. The extended optical model for fission is applied for neutron induced fission cross-section calculations on ^234,235,238U and ²³⁹Pu targets. A triple-humped fission barrier is used for ^234,235U(n,f), while a double-humped fission barrier is used for ²³⁸U(n,f) and ²³⁹Pu(n,f) reactions as predicted by theoretical barrier calculations. The impact of partial damping of class-II/III states, and of direct transmission through discrete and continuum fission channels, is shown to be critical for a proper description of the measured fission cross sections for ^234,235,238U(n,f) reactions. The ²³⁹Pu(n,f) reaction can be calculated in the complete damping approximation. Calculated cross sections for ^235,238U(n,f) and ²³⁹Pu(n,f) reactions agree within 3% with the corresponding cross sections derived within the Neutron Standards least-squares fit of available experimental data. Lastly, the extended optical model for fission can be used for both theoretical fission studies and nuclear data evaluation.

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

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

Grant/Contract Number:: SC00112704

OSTI ID:: 1245393

Report Number(s):: BNL-111952-2016-JA; PRVCAN; R&D Project: EST-003-NEFA; KB0301041

Journal Information:: Physical Review C, Vol. 93, Issue 3; ISSN 2469-9985

Publisher:: APSCopyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 14 works

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