Speaker
Description
About 50% of the stable isotopes heavier than iron are synthesized via explosive nucleosynthesis processes [Thi17, Arc14, Rau13]. The path of the weak r-process (which synthesizes light neutron-rich isotopes) and the γ-process (which is mainly responsible for the synthesis of the 32-35 proton-rich nuclei) is located close to the valley of stability. Accordingly, several relevant reactions can be studied using stable targets and the activation technique [Gyü19]. The modeling of these astrophysical scenarios requires the use of reaction network calculation. The necessary cross sections are taken from the Hauser-Feshbach (H-F) model calculations. For reactions involving α-particles the key input of the H-F model is the α-nucleus optical model potential (α-OMP). By carrying out (α,n) cross section measurements, the available α-OMP parameter sets can be studied.
For this purpose a series of activation cross section measurements were carried out and further studies are in progress at Atomki. In this presentation an overview on the recent measurement of the 96Zr(α,n) [Kis21] and 100Mo(α,n) [Sze21] reactions, relevant for the weak r-process nucleosynthesis will be given. Furthermore, the cross sections of the 92,94Mo(α,n) and 92Mo(α,p) reactions were also measured to constrain the α-OMP’s used in γ-process simulations. Details on the cross section measurements and their impact on the theoretical calculations will be presented.
[Thi17] F.-K. Thielemann et al., Annu. Rev. Nucl. Part. Sci. 67:253–74 (2017).
[Arc14] A Arcones and J Bliss, J. Phys. G: Nucl. Part. Phys. 41, 044005 (2014).
[Rau13] T. Rauscher et al., Rep. Prog. Phys. 76, 066201 (2013).
[Gyü19] Gy. Gyürky et al., Eur. Phys. J. A 55: 41 (2019).
[Kis21] G.G. Kiss et al., Astrophys. J. 908:2, 202 (2021).
[Sze21] T.N. Szegedi et al., Phys. Rev. C 104, 035804 (2021).
| Length of presentation requested | Oral presentation: 17 min + 3 min questions |
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| Please select between one and three keywords related to your abstract | Nuclear physics - experimental |
