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

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.

arXiv commentIncludes modifications due to referee remarks

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• Two-step nuclear reactions: The Surrogate Method, the Trojan Horse Method and their common foundations
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• Direct Determination of Fission-Barrier Heights Using Light-Ion Transfer in Inverse Kinematics
• First simultaneous measurement of the gamma-ray and neutron emission probabilities in inverse kinematics at a heavy-ion storage ring
• Secondary Neutron Production from Thick Target Deuteron Breakup
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• Neutron capture cross sections of radioactive nuclei