Speaker
Description
The existence of some stable neutron deficient nuclei - the p nuclei - can not be explained by neutron-capture processes [1]. Therefore, other types of reactions - dominantly photodisintegration reactions - come into play. This is called the $\gamma$ process. Statistical model calculations play a crucial role in modelling this process as cross sections for many of these photodisintegration reactions are not known trough experiments.
Two in-beam experiments were performed at the University of Cologne's high-efficiency HPGe $\gamma$-ray spectrometer HORUS to study the $^{85,87}$Rb$(p, \gamma)^{86,88}$Sr reactions. A 10 MV FN Tandem accelerator provided proton beams between $E_p = 2$ and $5$ MeV. Total cross-section values were determined for six different proton-beam energies for the $^{87}$Rb$(p, \gamma)^{88}$Sr reaction and for three different proton-beam energies for the $^{85}$Rb$(p, \gamma)^{86}$Sr reaction. These first experimental cross-section values for the $^{85,87}$Rb$(p, \gamma)^{86,88}$Sr reactions help to constrain the nuclear physics input for statistical model calculations.
Supported by the DFG (ZI 510/8-2).
[1]T. Rauscher \textit{et al}., Rep. Prog. Phys. \textbf{76} (2013) 066201.
