MARINI, P.; DUCASSE, Q.; JURADO, B.; AICHE, M.; MATHIEU, L.; BARREAU, G.; CZAJKOWSKI, S.; TSEKHANOVICH, I.; MORO, A.; LEI, J.; GIACOPPO, F.; GORGEN, A.; AUDOUIN, L.; TASSAN-GOT, L.; WILSON, J.N.; GUNSING, F.; GUTTORMSEN, M.; LARSEN, A.C.; LEBOIS, M.; RENSTROM, T.; ROSE, S.; SIEM, S.; TVETEN, G.M.; WIEDEKING, M.; SEROT, O.; BOUTOUX, G.; MÉOT, V.; MORILLON, B.; DENIS-PETIT, D.; ROIG, O.; OBERSTEDT, S.; OBERSTEDT, A.

doi:10.1051/epjconf/201612212004

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MARINI, P.
Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]

DUCASSE, Q.
Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
CEA Cadarache

JURADO, B.
Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]

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EPJ Web Conf., EPJ Web Conf., 2015-10-19, Tokyo. 2016, vol. 122, p. 12004

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Fission and gamma decay probabilities of ^237U and ^239Np have been measured, for the first time simultaneously in dedicated experiments, via the surrogate reactions ^238U(^3He, ^4He) and ^238U(^3He,d), respectively. While a good agreement between our data and neutron-induced data is found for fission probabilities, gamma decay probabilities are several times higher than the corresponding neutron-induced data for each studied nucleus. We study the role of the different spin distributions populated in the surrogate and neutron-induced reactions. The compound nucleus spin distribution populated in the surrogate reaction is extracted from the measured gamma-decay probabilities, and used as input parameter in the statistical model to predict fission probabilities to be compared to our data. A strong disagreement between our data and the prediction is obtained. Preliminary results from an additional dedicated experiment confirm the observed discrepancies, indicating the need of a better understanding of the formation and decay processes of the compound nucleus.< Réduire

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First simultaneous measurement of fission and gamma probabilities of $^{237}$U and $^{239}$Np via surrogate reactions

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