Validation of the Characteristic Function Model for the Unresolved Resonance Region

Journal Article · Thu Feb 15 04:00:00 EST 2001 · Nuclear Science and Engineering

OSTI ID:20804696

Koyumdjieva, N; Janeva, N; Volev, K ^[1]

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1. Bulgarian Academy of Sciences (Bulgaria)

There is a significant extension of the region of resolved resonances (RRR) for some nuclei to higher energies, and this has repercussions on the last updated versions of the evaluated nuclear data libraries. This energy extension covers intervals of the resonant cross-section structure, previously treated as an unresolved resonance region (URR). The reality of this situation provides an opportunity to verify a new statistical model of the resonant cross-section structure in the URR based on the characteristic function F of the R-matrix element distribution. For this purpose, the average cross sections and self-shielding factors obtained by the characteristic function model are compared with the corresponding quantities calculated by the Reich-Moore formalism of the R-matrix theory of nuclear reactions with the evaluated resonance parameters in the RRR. The ENDF/B-VI and JENDL 3.2 resolved resonance parameters of {sup 56}Fe and {sup 238}U are used for the cross-section calculations.

• OSTI ID: 20804696
• Journal Information: Nuclear Science and Engineering, Journal Name: Nuclear Science and Engineering Journal Issue: 2 Vol. 137; ISSN NSENAO; ISSN 0029-5639
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CROSS SECTIONS
DISTRIBUTION
IRON 56
NUCLEAR DATA COLLECTIONS
NUCLEAR REACTIONS
R MATRIX
RESONANCE
SELF-SHIELDING
STATISTICAL MODELS
URANIUM 238
VALIDATION