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

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We measured the ratio of the fission probabilities of {sup 234}U* relative to {sup 236}U* formed via an ({alpha},{alpha}{prime}) 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}{prime}) can be used to determine an unknown fission cross section relative to a known one. The ... continued below

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5 p. (0.3 MB)

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Lesher, S R; Bernstein, L A; Ai, H; Beausang, C W; Bleuel, D; Burke, J T et al. January 9, 2008.

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We measured the ratio of the fission probabilities of {sup 234}U* relative to {sup 236}U* formed via an ({alpha},{alpha}{prime}) 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}{prime}) 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].

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5 p. (0.3 MB)

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  • Presented at: CNR 2007, Yosemite, CA, United States, Oct 22 - Oct 26, 2007

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  • Report No.: LLNL-PROC-400514
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 926073
  • Archival Resource Key: ark:/67531/metadc901140

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  • January 9, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • April 13, 2017, 6:15 p.m.

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Lesher, S R; Bernstein, L A; Ai, H; Beausang, C W; Bleuel, D; Burke, J T et al. Benchmarking the External Surrogate Ratio Method using the (alpha,alpha' f) reaction at STARS, article, January 9, 2008; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc901140/: accessed December 10, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.