An improved numerical method to compute neutron/gamma deexcitation cascades starting from a high spin state

Regnier, D.; Litaize, O.; Serot, O.

doi:10.1016/j.cpc.2015.12.007

Title: An improved numerical method to compute neutron/gamma deexcitation cascades starting from a high spin state

Journal Article · Wed Dec 23 00:00:00 EST 2015 · Computer Physics Communications

DOI:https://doi.org/10.1016/j.cpc.2015.12.007· OSTI ID:1342046

Regnier, D. ^[1]; Litaize, O. ^[2]; Serot, O. ^[2]

CEA, DEN, DER, SPRC, Saint Paul lez Durance (France); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
CEA, DEN, DER, SPRC, Saint Paul lez Durance (France)

Numerous nuclear processes involve the deexcitation of a compound nucleus through the emission of several neutrons, gamma-rays and/or conversion electrons. The characteristics of such a deexcitation are commonly derived from a total statistical framework often called “Hauser–Feshbach” method. In this work, we highlight a numerical limitation of this kind of method in the case of the deexcitation of a high spin initial state. To circumvent this issue, an improved technique called the Fluctuating Structure Properties (FSP) method is presented. Two FSP algorithms are derived and benchmarked on the calculation of the total radiative width for a thermal neutron capture on ²³⁸U. We compare the standard method with these FSP algorithms for the prediction of particle multiplicities in the deexcitation of a high spin level of ¹⁴³Ba. The gamma multiplicity turns out to be very sensitive to the numerical method. The bias between the two techniques can reach 1.5 γγ/cascade. Lastly, the uncertainty of these calculations coming from the lack of knowledge on nuclear structure is estimated via the FSP method.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1342046

Alternate ID(s):: OSTI ID: 1247062

Report Number(s):: LLNL-JRNL-668707

Journal Information:: Computer Physics Communications, Vol. 201, Issue C; ISSN 0010-4655

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 22 works

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