Thermal Neutron Capture Branching Ratio of 209BI Using a Gamma-Ray Technique

Details Thermal Neutron Capture Branching Ratio of 209BI Using a Gamma-Ray Technique Thermal Neutron Capture Branching Ratio of 209BI Using a Gamma-Ray Technique

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cgrs.conf..734l&link_type=abstract

CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS. Proceedings of the Eleventh International Symposium. Held 2-6 September 2002

Physics

Scientific paper

A new experimental program concerning the measurement of the neutron capture branching ratio of 209Bi as a function of neutron energy has been proposed recently. The preliminary results obtained at the high neutron flux reactor of ILL with a thermal neutron flux are presented in this paper. The neutron capture cross section and the corresponding branching ratio are measured with an on-line gamma-ray spectroscopy method. We find for the capture cross section 35±1.75 mb, what is in a good agreement with existing results. For the partial cross sections we get σ210gs = 17.9±2 mb and σ210m =17.1±2 mb giving a branching ratio of 51%±5%. This value is by 25% smaller than values from evaluated libraries.

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