Fluctuation effects in radiative capture to unstable final states: A test via theY89(p→,γ) reaction at<

High energy gamma rays from p+X, X=Cu, Ag, Au at 34 MeV

“…A DSD model with direct E1, E2, and E3 and semidirect E1 radiation was developed to reproduce the data for an experiment performed at TUNL [4]. The model has worked quite well in explaining the data, both at 19.6 MeV and the higher energies in the present work.…”

“…This DSD model is supplemented by a HauserFeshbach calculation, which is the predominant source of gammas below approximately 15 MeV. The combined model worked well at 19.6 MeV incident energy for 89 Y( p,γ) in reproducing the yield as well as the angular distributions and analyzing powers [4]. The present calculations were undertaken to ascertain whether the model works well also at higher energies.…”

“…The second type of calculation is based on a direct-semidirect model which originally incorporated direct E1, E2, E3 and semidirect E1 radiation to calculate capture to unbound final states [4]. This DSD model is supplemented by a HauserFeshbach calculation, which is the predominant source of gammas below approximately 15 MeV.…”

Compound-Nuclear Reaction Cross Sections from Surrogate Measurements: Status and Challenges

“…In Ref. [22], he considered the case of direct-semidirect neutron capture, employing the formalism developed by Parker et al [23]. While direct (or direct-semidirect) nucleon capture is not typically considered in practical applications of the Surrogate method, the insights gained from studying this process have implications for the Surrogate approach.…”

“…The formalism developed in Ref. [23] allows one to calculate the cross sections for both capture to unbound states (and thus for escape of the nucleon from the combined target-plus-nucleon system immediately after capture) and capture followed by absorption via an imaginary potential (which represents the formation of a compound nucleus). In Ref.…”