R-matrix analysis of Cl neutron cross sections up to 1.2 MeV

R. O. Sayer, K. H. Guber, L. C. Leal, N. M. Larson, T. Rauscher

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Abstract

We have analyzed and evaluated Cl35, Cl37, and natCl neutron cross section data in the resolved resonance region with the multilevel Reich-Moore R-matrix formalism. Energies and widths were determined for 388 resonances in the range 0.2 to 1200 keV. New J assignments were made for 33 resonances, and parities were assigned for 15 of these resonances. Neutron strength functions were calculated for both s and p waves; our results include the first reported p-wave values for Cl. Resonance analyses were carried out with the computer code SAMMY, which utilizes Bayes' method, a generalized least-squares technique. Because SAMMY now has the ability to calculate charged-particle penetrabilities, it was possible to include a proton exit channel in the analysis and to deduce proton widths for several resonances. Our resonance parameter representation describes the data much better than pre-vious evaluations, and it should lead to improved criticality safety calculations for systems where Cl is present.

Original languageEnglish
Article number044603
JournalPhysical Review C - Nuclear Physics
Volume73
Issue number4
DOIs
StatePublished - 2006

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