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Simultaneous determination of neutron-induced fission and radiative capture cross sections from decay probabilities obtained with a surrogate reaction

代理反応崩壊測定による核分裂断面積と中性子捕獲断面積の同時測定

P$'e$rez S$'a$nchez, R.*; Jurado, B.*; M$'e$ot, V.*; Roig, O.*; Dupuis, M.*; Bouland, O.*; Denis-Petit, D.*; Marini, P.*; Mathieu, L.*; Tsekhanovich, I.*; A$"i$che, M.*; Audouin, L.*; Cannes, C.*; Czajkowski, S.*; Delpech, S.*; G$"o$rgen, A.*; Guttormsen, M.*; Henriques, A.*; Kessedjian, G.*; 西尾 勝久; Ramos, D.*; Siem, S.*; Zeiser, F.*

P$'e$rez S$'a$nchez, R.*; Jurado, B.*; M$'e$ot, V.*; Roig, O.*; Dupuis, M.*; Bouland, O.*; Denis-Petit, D.*; Marini, P.*; Mathieu, L.*; Tsekhanovich, I.*; A$"i$che, M.*; Audouin, L.*; Cannes, C.*; Czajkowski, S.*; Delpech, S.*; G$"o$rgen, A.*; Guttormsen, M.*; Henriques, A.*; Kessedjian, G.*; Nishio, Katsuhisa; Ramos, D.*; Siem, S.*; Zeiser, F.*

Reliable neutron-induced-reaction cross sections of unstable nuclei are essential for nuclear astrophysics and applications but their direct measurement is often impossible. The surrogate-reaction method is one of the most promising alternatives to access these cross sections. In this work, we successfully applied the surrogate-reaction method to infer for the first time both the neutron-induced fission and radiative capture cross sections of $$^{239}$$Pu in a consistent manner from a single measurement. This was achieved by combining simultaneously measured fission and $$gamma$$-emission probabilities for the $$^{240}$$Pu($$^{4}$$He, $$^{4}$$He') surrogate reaction with a calculation of the angular-momentum and parity distributions populated in this reaction. While other experiments measure the probabilities for some selected $$gamma$$-ray transitions, we measure the $$gamma$$-emission probability. This enlarges the applicability of the surrogate-reaction method.

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