Abstract
The 75As(d,pγ) reaction in inverse kinematics as a surrogate for neutron capture was performed at Oak Ridge National Laboratory using a deuterated plastic target. The intensity of the 165 keV γ-ray from 76As in coincidence with ejected protons, from exciting 76As above the neutron separation energy populating a compound state, was measured. A tight geometry of four segmented germanium clover γ-ray detectors together with eight ORRUBA-type silicon-strip charged-particle detectors was used to optimize geometric acceptance. The preliminary analysis of the 75As experiment, and the eïňČcacy and future plans of the (d,pγ) surrogate campaign in inverse kinematics, are discussed.
Highlights
Surrogate reactions are used to populate compound nuclear states through an alternate process than the desired reaction of interest
The 75As(d,pγ) reaction in inverse kinematics as a surrogate for neutron capture was performed at Oak Ridge National Laboratory using a deuterated plastic target
This is especially true for neutron capture reactions on short-lived nuclei
Summary
Surrogate reactions are used to populate compound nuclear states through an alternate (and often easier to perform) process than the desired reaction of interest This is especially true for neutron capture reactions on short-lived nuclei. ΣCαN is the compound nucleus, and the cross section for forming GCχ N is the decay probability to channel χ. Both are dependent on Eex, J (spin), and π (parity). Experiments can attempt to measure the decay probability to channel χ by populating the same compound nucleus through a surrogate reaction. The experiment records the coincident probability of creating the compound nucleus through the alternate entrance channel (δ) together with the desired exit channel (χ): Pδχ(Eex) = FδCN (Eex, J, π)GCχ N (Eex, J, π). Weisskopf-Ewing approximation is not valid for many cases and substantial theoretic work is still required to account for the spin-party mismatch between the desired reaction and the surrogate
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