First radiative proton capture measurements on 107,109-Ag and 112-Cd relevant to the p-process

One of the important, but still unsettled topics in Nuclear Astrophysics is the production of the p-nuclei [1,2]. The p-process relies on an extended reaction network, which can be described theoretically by the Hauser-Feshbach statistical model, which in turn relies strongly on experimental data. To provide reliable data for p-nuclei, an experimental campaign at the Tandem Accelerator Laboratory of NCSR "Demokritos'', focusing on measurements of cross-sections in the 107,109Ag(p,γ)108,110Cd [3] and 112Cd(p,γ)113In [4]
reactions was carried out. Both reactions were studied using a set of four HPGe detectors via the in-beam γ-ray spectroscopy, while for the latter the activation method was additionally employed to account for the population of a low-lying isomeric state. Total cross sections for proton beam energies lying inside the Gamow window for energies relevant to p-process nucleosynthesis were obtained for the first time. Experimental results are compared to Hauser-Feshbach calculations performed with the latest version of the TALYS code (v1.9) [5]. An overall good agreement has been achieved. These results provide important new input for the theoretical description of the p-process, but additionally for the origin of the cross-point p-nucleus 113In.

References

[1] M. Arnould and S. Goriely, Phys. Rep. 384, 1 (2003)
[2] T. Rauscher et al., Rep. Prog. Phys. 76, 066201 (2013)
[3] A. Khaliel et al., Phys. Rev. C 96, 035806 (2017)
[4] A. Psaltis et al. (2018), in prep.
[5] A. Koning, S. Hilaire and S. Goriely, TALYS-1.9, A Nuclear Reaction Program, NRG-1755 ZG Petten, The Netherlands (2017)

Poster presented at the 15th International Symposium on Nuclei in the Cosmos (June 24-29, 2018 Assergi, L'Aquila, Italy)