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HK: Fachverband Physik der Hadronen und Kerne

HK 16: Nuclear Astrophysics II

HK 16.3: Vortrag

Dienstag, 17. März 2026, 17:00–17:15, PHIL A 602

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

The ⁹⁵Zr(n,γ) 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.
In the case of the unstable isotope ⁹⁵Zr, a direct measuements of the neutron capture cross section is currently not possible. Using the Oslo method, we have constrained the neutron capture cross section of ⁹⁵Zr(n,γ) experimentally, for the first time. We utilized the ⁹⁶Zr(p,p’) reaction at the 10 MV FN-Tandem accelerator of the Institute for Nuclear Physics at the University of Cologne using the SONIC@HORUS detector array. We have successfully used the newly developed "Shape" method to significantly reduce the model uncertainties of our result by extracting the absolute nuclear level density at the neutron separation energy.
The preliminary results of these measurements and their impact on the s-process will be presented.

Keywords: Oslo-Method; s-process; Zirconium