Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 11: Nuclear Astrophysics I

HK 11.2: Talk

Monday, March 28, 2022, 14:30–14:45, HK-H10

Investigation of ^170,172Yb(α,n)^173,175Hf cross sections in a stacked target experiment — •Martin Müller, Felix Heim, Yanzhao Wang, Svenja Wilden, and Andreas Zilges — Institute for Nuclear Physics, University of Cologne

In spite of decades of research, many observed nuclear abundances remain that can not be reproduced by p-process nucleosynthesis calculations [1]. This is mainly due to the lack of constraints for the involved nuclear physics models. Previous studies have shown that key reactions affecting the abundance of the p-nucleus ¹⁶⁸Yb are the ^164,166Yb(α, γ) reactions and that these are mostly sensitive to the α-optical-model-potential (α-OMP) [2,3]. To study the α-OMP in the Yb chain and its dependence on the proton-to-neutron ratio, a stacked target activation experiment was performed at the University of Cologne’s Cologne Clover Counting setup investigating the ^170,172Yb(α,n)^173,175Hf reaction cross sections. The results were validated by simultaneous measurements of the well established ⁵⁵Mn(α,(2)n)^57,58Co and ⁵⁴Fe(α, n)⁵⁷Ni reaction cross sections. All measurements were compared to statistical model calculations performed using the TALYS-1.95 code [4].

Supported by the DFG (ZI 510/8-2).

[1] M. Arnould and S. Goriely, Phys. Rep. 384, 1 (2003)

[2] T. Rauscher et al., Mon. Not. R. Astron. Soc. 463, 4153 (2016)

[3] T. Rauscher et al., Astrophys. J. Suppl. Ser. 201, 26 (2012)

[4] A. J. Koning et al., Nucl. Data Sheets 113, 2841 (2012)