Benchmarking the External Surrogate Ratio Method using the ({alpha},{alpha}{sup '}f) reaction at STARS

Journal Article · Thu Apr 17 04:00:00 EDT 2008 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2920712· OSTI ID:21143133

Lesher, S R ^[1]; Bernstein, L A; Bleuel, D; Burke, J T; Lyles, B F; Moody, K J; Norman, E B ^[1]; Ai, H ^[2]; Beausang, C W ^[3]; Clark, R M; Fallon, P; Gibelin, J; Lee, I Y; Macchiavelli, A O; McMahan, M A; Phair, L; Rodriguez-Vieitez, E; Wiedeking, M ^[4]

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1. Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
2. Yale University, New Haven, Connecticut 06520 (United States)
3. Department of Physics, University of Richmond, Richmond, Virginia 23173 (United States)
4. Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)

We measured the ratio of the fission probabilities of {sup 234}U* relative to {sup 236}U* formed via an ({alpha},{alpha}{sup '}) direct reactions using the STARS array at the 88-inch cyclotron at the Lawrence Berkeley National Laboratory. This ratio has a shape similar to the ratio of neutron capture probabilities from {sup 233}U(n,f) and {sup 235}U(n,f), indicating the alpha reactions likely formed a compound nucleus. This result indicates that the ratios of fission exit channel probabilities for two actinide nuclei populated via ({alpha},{alpha}{sup '}) can be used to determine an unknown fission cross section relative to a known one. The validity of the External Surrogate Ratio Method (ESRM) is tested and the results support the conclusions of Burke et al. [1].

• OSTI ID: 21143133
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1005; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA REACTIONS
CAPTURE
COMPOUND NUCLEI
CROSS SECTIONS
DIRECT REACTIONS
FISSION
FISSION RATIO
NEUTRON REACTIONS
SCATTERING
STATISTICAL MODELS
URANIUM 233 TARGET
URANIUM 234
URANIUM 235 TARGET
URANIUM 236