Abstract
The surrogate ratio method has been tested for () and () reactions on uranium nuclei. U and U targets were bombarded with 28-MeV protons and the light ion recoils and fission fragments were detected using the Silicon Telescope Array for Reaction Studies detector array at the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory. The (,) reaction channels on U and U targets were used as a surrogate to determine the [U(,)]/[U(,)] cross-section ratio. The (,) reaction channels were also measured with the same targets as a surrogate for the [U(,)]/[(U(,)] ratio. For the (,) and (,) surrogate measurements, there is good agreement with accepted (,) values over equivalent neutron energy ranges of –7 MeV and –5.5 MeV, respectively. An internal surrogate ratio method comparing the () and (,) reaction channels on a single target is also discussed. The [U(,)]/[U(,)] and [U(,)]/[U(,)] cross-section ratios are extracted using this method for the U and U targets, respectively. The resulting fission cross-section ratios show relatively good agreement with accepted values up to MeV.
2 More- Received 20 December 2011
DOI:https://doi.org/10.1103/PhysRevC.85.024613
©2012 American Physical Society