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Bonn 2020 – scientific programme

The DPG Spring Meeting in Bonn had to be cancelled! Read more ...

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HK: Fachverband Physik der Hadronen und Kerne

HK 58: Nuclear Astrophysics II

HK 58.6: Talk

Friday, April 3, 2020, 12:30–12:45, J-HS B

α-spectroscopy to determine 144Sm(α,γ)148Gd production — •Heinrich Wilsenach1, Philipp Scholz2, Andreas Zilges2, and Kai Zuber11TU Dresden, Institut für Kern- und Teilchenphysik, Germany — 2University of Cologne, Institute for Nuclear Physics, 50937 Köln, Germany

Measurements of p-nuclei production rates help to shed some light on the observed abundances and help to constrain predictions made with extended reaction networks. One of the outstanding measurement is the 144Sm(α,γ)148Gd cross section [1]. The predicted cross section varies from the measurement by more than an order of magnitude [2], making this cross section the most uncertain p-process nuclide production. For this reason a re-measurement was performed using isotopically enriched 144Sm, activated at various energies close to the Gamow window. The 148Gd α-decay was used to determine the amount of the produced material. The decay rates were expected to be in the range of 4 per hour. To measure such a low count-rate an ultra-low background ionisation chamber at IKTP TU Dresden was used. The chamber achieved a background rate in the region of interest (1 MeV to 4 MeV) of around 0.27 counts per day per MeV. The subject of this talk is to describe the method used to determine the amount of 148Gd produced in the (α,γ) activation of enriched 144Sm samples. Advanced simulations are fitted to data to help constrain systematic uncertainties. [1] E. Somorjai et al. Astron. Astrophys. 333, (1998) 1112-1116 [2] T. Rauscher et al. Rep. Prog. Phys. 76, (2013) 066201 (38pp)

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