Erlangen 2026 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 31: Structure and Dynamics of Nuclei VII
HK 31.5: Talk
Thursday, March 19, 2026, 15:15–15:30, AM 00.011
Production cross-sections of N≈126 fragments from 1 GeV/u 208Pb at FRagment Separator FRS — •Suraj Kumar Singh for the Super-FRS Experiment collaboration — GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany — Justus-Liebig-Universität Gießen, Germany
Studies of nuclei far from the valley of stability are crucial for understanding nuclear reactions and nuclear structure, with implications ranging from fundamental physics to nuclear astrophysics and applications. In particular, neutron-rich nuclei near the N = 126 shell closure play a key role as potential waiting-point nuclei in the rapid neutron-capture (r-) process, strongly influencing the formation of the heaviest elements in the universe. Accessing these isotopes requires reliable predictions of production rates, which in turn depend on accurate production cross-sections. Since theoretical calculations in this region remain challenging, experimental cross-section measurements provide essential input for planning future studies of these exotic nuclides and for improving reaction models.
In this contribution, cross-section measurements from 1 GeV/u 208Pb projectiles on a 9Be target, performed at the Fragment Separator (FRS) at GSI will be presented. The new data provide insights into the underlying production mechanisms and serve as important benchmarks for state-of-the-art theoretical models used to predict yields of yet-unmeasured isotopes.
Keywords: Fragmentation cross-section; Inflight separator; RIB; exotic nuclei; 208Pb