Abstract
The relative -decay probabilities of the to and to residual nuclei, produced using light-ion-induced direct reactions, were measured as a function of excitation energy using the CACTUS array at the Oslo Cyclotron Laboratory. The external surrogate ratio method (SRM) was used to convert these relative -decay probabilities into the (,) cross section in an equivalent neutron energy range of 130–560 keV. The directly measured (,) cross section, obtained from the Evaluated Nuclear Data Files (ENDF/B-VII.0), was compared to the experimentally determined surrogate (,) cross section obtained using compound-nucleus pairs with both similar ( to ) and dissimilar ( to ) nuclear structures. A -ray energy threshold was identified, based upon pairing gap parameters, that provides a first-order correction to the statistical -ray tagging approach and improves the agreement between the surrogate cross-section data and the evaluated result.
- Received 2 December 2009
DOI:https://doi.org/10.1103/PhysRevC.81.054606
©2010 American Physical Society