Abstract
We performed the 174Yb(p,d) reaction in order to measure the gamma-emission probability of 173Yb. The identification of the ejectiles — allowing us to tag the production of 173Yb nuclei — was performed using the STARLiTeR detector system. Unusually, the “statistical“ γ-rays were used to determined the gammaemission probability and a spin distribution was extracted from it. A comparison with the spin distribution from the 174Yb(3He,α) reaction shows that the transferred angular momentum is similar in both reactions.
Highlights
We performed the 174Yb(p,d) reaction in order to measure the gamma-emission probability of 173Yb
Radiative neutron capture cross section measurements on stable nuclei are performed using a rather well mastered technique. It is much less straightforward when these cross section measurements are performed on radioactive nuclei
The surrogate reaction method is based on the hypothesis that the decay of a compound nucleus is independent from its formation
Summary
Radiative neutron capture cross section measurements on stable nuclei are performed using a rather well mastered technique. In Hauser-Feshbach theory [4], the radiative neutron capture cross section σ(An−,γ1) can be related to the compound nucleus formation cross section σA(En, J, π) and to the decay branching ratio of the compound nucleus GγA(E∗, J, π) via the following equation (the width fluctuation correlations between entrance and exit channels are neglected) [5]. The compound nucleus formation cross section is usually determined from optical model calculation whilst the branching ratio GγA is measured. The surrogate reaction method is used within the Weisskopf-Ewing limit [6] which stipulates that the branching ratio for the decay of the compound nucleus does not rely on the spin and the parity of the compound nucleus but only on its excitation energy. The LIBERACE HPGe detectors collected the γ-rays emitted by 173Yb in coincidence with the deuterons
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