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arXiv · 1512.06334

Study of the 238U(d,p) surrogate reaction via the simultaneous measurement of gamma-decay and fission probabilities

Q. Ducasse·B. Jurado·M. Aïche·P. Marini·L. Mathieu·A. Görgen·M. Guttormsen·A. C. Larsen·T. Tornyi·J. N. Wilson·G. Barreau·G. Boutoux·S. Czajkowski·F. Giacoppo·F. Gunsing·T. W. Hagen·M. Lebois·J. Lei·V. Méot·B. Morillon·A. Moro·T. Renstrøm·O. Roig·S. J. Rose·O. Sérot·S. Siem·I. Tsekhanovich·G. M. Tveten·M. Wiedeking
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Abstract

We investigated the 238U(d,p) reaction as a surrogate for the n + 238U reaction. For this purpose we measured for the first time the gamma-decay and fission probabilities of 239U* simultaneously and compared them to the corresponding neutron-induced data. We present the details of the procedure to infer the decay probabilities, as well as a thorough uncertainty analysis, including parameter correlations. Calculations based on the continuum-discretized coupled-channels and distorted-wave Born approximations were used to correct our data from detected protons originating from elastic and inelastic deuteron breakup. In the region where the fission and gamma-decay probabilities compete, the corrected fission probability is in agreement with neutron-induced data, whereas the gamma-decay probability is much higher than the neutron-induced data. The performed statistical-model calculations are not able to explain these results.

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Q. Ducasse, B. Jurado, M. Aïche, P. Marini, L. Mathieu, A. Görgen, M. Guttormsen, A. C. Larsen, T. Tornyi, J. N. Wilson, G. Barreau, G. Boutoux, S. Czajkowski, F. Giacoppo, F. Gunsing, T. W. Hagen, M. Lebois, J. Lei, V. Méot, B. Morillon, A. Moro, T. Renstrøm, O. Roig, S. J. Rose, O. Sérot, S. Siem, I. Tsekhanovich, G. M. Tveten, M. Wiedeking. 2015-12-20. Study of the 238U(d,p) surrogate reaction via the simultaneous measurement of gamma-decay and fission probabilities. https://doi.org/10.1103/physrevc.94.024614

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