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

• Main Authors: Jurado B., Marini P., Mathieu L., Aiche M., Czajkowski S., Tsekhanovich I., Audouin L., Boutoux G., Denis-Petit D., Guttormsen M., Kessedjian G., Lebois M., Méot V., Oberstedt A., Oberstedt S., Roig O., Sérot O., Tassan-Got L., Wilson J.N.
• Format: Article
• Language: English
• Published: EDP Sciences 2017-01-01
• Series: EPJ Web of Conferences
• Online Access: https://doi.org/10.1051/epjconf/201714611006

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 238U(d,p), 238U(3He,t) and 238U(3He,4He) reactions as surrogates for the neutron-induced n +  238U, n +  237Np and n +  236U 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.