Sep 4 – 9, 2022
Europe/Zurich timezone

Investigation of $^{170,172}$Yb($\alpha,n$)$^{173,175}$Hf cross sections in a stacked target experiment

Sep 6, 2022, 6:00 PM
61/1-201 - Pas perdus - Not a meeting room - (CERN)

61/1-201 - Pas perdus - Not a meeting room -


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Martin Müller (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 $^{168}$Yb are the $^{164,166}$Yb($\alpha, \gamma$) reactions and that these are mostly sensitive to the $\alpha$-optical-model-potential ($\alpha$-OMP) [2,3].
To study the $\alpha$-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 $^{170,172}$Yb($\alpha,n$)$^{173,175}$Hf reaction cross sections.
The results were validated by simultaneous measurements of the well established $^{55}$Mn($\alpha,(2)n$)$^{57,58}$Co and $^{54}$Fe($\alpha, n$)$^{57}$Ni reaction cross sections.
All measurements were compared to Hauser-Feshbach statistical model calculations [4].

[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] W. Hauser and H. Feshbach, Phys. Rev. 87, 366 (1952)

Primary author

Martin Müller (University of Cologne)


Felix Heim Mr Yanzhao Wang (University of Cologne) Svenja Wilden (University of Cologne) Andreas Zilges (University of Cologne)

Presentation materials