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HK: Fachverband Physik der Hadronen und Kerne

HK 45: Nuclear Astrophysics VI

HK 45.3: Vortrag

Donnerstag, 13. März 2025, 14:30–14:45, SR 0.03 Erw. Physik

Constraining the ⁹⁵Zr(n,γ) cross section via the Oslo-method — •Tom Sittig¹, Anna Bohn¹, Devin Hymers¹, Abdallah Karaka¹, Markus Müllenmeister¹, Sarah Prill¹, Sebastian Schröder¹, Artemis Spyro², Michael Weinert¹, Gereon Weingarten¹, and Dennis Mücher¹ — ¹Institute of Nuclear Physics, University of Cologne, Cologne, Germany — ²Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan, USA

Using the Oslo method we aim to constrain the neutron capture cross section of ⁹⁵Zr via the ⁹⁶Zr(p,p’) reaction. This cross section is of pivotal understanding for the slow neutron capture process (s-process) as the long-lived ⁹⁵Zr isotope is a branching point at which β-decay is in competition with the production of ⁹⁶Zr. But thus far its stellar neutron capture cross section is not experimentally known.
Measurements were performed at the 10 MV FN-Tandem accelerator of the Institute for Nuclear Physics at the University of Cologne using the SONIC@HORUS detector array [1]. For the main experiment a high purity ⁹⁶Zr target was irradiated with 15 MeV protons. Additionally, ⁹⁰Zr, ²⁸Si and ¹²C foils were irradiated to perform background subtractions as well as calibrating the detector response for the statistical Oslo-type analysis. The preliminary results of these first measurements will be presented, along with a discussion of the impact of the achieved precision on our understanding of the s-process.
[1] Pickstone et al, 2017, 10.1016/j.nima.2017.09.016

Keywords: Oslo-Method; s-process; Zirconium