EPJ Web of Conferences (Jan 2017)

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

  • 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.

DOI
https://doi.org/10.1051/epjconf/201714611006
Journal volume & issue
Vol. 146
p. 11006

Abstract

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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.