^140,142Ce Neutron Cross Section Resolved Resonance Region Evaluation [Abstract]

Conference · Mon Jul 25 04:00:00 EDT 2022

OSTI ID:1899601

Chapman, Chris W. ^[1]; Pigni, Marco ^[1]; Guber, Klaus ^[1]; Arbanas, Goran ^[1]

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1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

A resolved resonance region evaluation of ^140,142Ce has been carried out by Oak Ridge National Laboratory. Requested by the US Nuclear Criticality Safety Program, this evaluation is based on recent high-resolution transmission and capture high-resolution measurements of ^natCe and ¹⁴²Ce conducted at JRC-GEEL at the Geel Linear Accelerator facility, as well as recently measured thermal constants available from the EXFOR database. Starting from the resonance parameters from the ENDF/B-VIII.0 library and following a preliminary R-matrix analysis, an updated set of resonance parameters and corresponding covariance information was derived by the fit of these experimental datasets using the Reich-Moore approximation of the R-matrix theory as implemented in the SAMMY code system. The resolved resonance region upper energy limit for ¹⁴⁰Ce was kept at 200 keV while the ¹⁴²Ce resonance region was extended from 13 to 26 keV. This new evaluation was found to be in good agreement not only with several integral quantities of interest to the reactor physics community, but also with the stellar Maxwellian-averaged cross section.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1899601
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
97 MATHEMATICS AND COMPUTING
Nuclear Criticality Safety Program (NCSP)
Nuclear Data
R-matrix
SAMMY