Investigation of the surrogate-reaction method via the simultaneous measurement of gamma-emission and fission probabilities

B. Jurado; P. Marini; L. Mathieu; M. Aiche; S. Czajkowski; I. Tsekhanovich; L. Audouin; G. Boutoux; D. Denis-Petit; M. Guttormsen; G. Kessedjian; M. Lebois; V. Meot; Andreas Oberstedt; S. Oberstedt; O. Roig; O. Sérot; L. Tassan-Got; J.N. Wilson

doi:10.1051/epjconf/201714611006

Investigation of the surrogate-reaction method via the simultaneous measurement of gamma-emission and fission probabilities
Paper in proceeding, 2017

We present the results of two experiments where we have measured for the first time simultaneously the fission and gamma-decay probabilities induced by different surrogate reactions. In particular, we have investigated the 238 U(d,p), 238 U( 3 He,t) and 238 U( 3 He, 4 He) reactions as surrogates for the neutron-induced n + 238 U, n + 237 Np and n + 236 U reactions, respectively. In the region where gamma emission, neutron emission and fission compete, our results for the fission probabilities agree fairly well with the neutron-induced data, whereas our gamma-decay probabilities are significantly higher than the neutron-induced data. The interpretation of these results is not obvious and is discussed within the framework of the statistical model with preliminary results for calculated spin-parity distributions populated in surrogate reactions. We also present future plans for surrogate-reaction studies in inverse kinematics with radioactive-ion beams at storage rings.