EPJ Web of Conferences 146, 11006 (2017)
https://doi.org/10.1051/epjconf/201714611006

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

¹ CENBG, CNRS/IN2P3-Université de Bordeaux, Chemin du Solarium, BP. 120, 33175 Gradignan, France
² IPN d’Orsay, Bâtiment 100, 15 rue G. Clemenceau, 91406 Orsay Cedex, France
³ CELIA, 43 rue Pierre Noailles, 33405 Talence Cedex, France
⁴ CEA DAM DIF, 91297 Arpajon, France
⁵ Department of Physics, University of Oslo, 0316 Oslo, Norway
⁶ LPSC, Université Grenoble-Alpes, CNRS/IN2P3, 38026 Grenoble Cedex, France
⁷ Fundamental Fysik, Chalmers Tekniska Högskola, 41296 Göteborg, Sweden
⁸ EC-JRC, IRMM, Retieseweg 111, 2440 Geel, Belgium
⁹ CEA-Cadarache, DEN/DER/SPRC/LEPh, 13108 Saint-Paul-lez-Durance, France

^a e-mail: jurado@cenbg.in2p3.fr

Published online: 13 September 2017

Abstract

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.