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HK: Fachverband Physik der Hadronen und Kerne
HK 66: Structure and Dynamics of Nuclei XIII
HK 66.1: Talk
Thursday, March 14, 2024, 15:45–16:00, HBR 19: C 5b
Towards electron-induced fission at the S-DALINAC — •G. Steinhilber1, N. Pietralla1, M. Arnold1, J. Birkhan1, M. Block2, M.L. Cortès1, J. Isaak1, T. Galatyuk1, T. Ramaker1, and M. Spall1 — 1IKP, Technische Universität Darmstadt — 2GSI Helmholtzzentrum für Schwerionenforschung
The origin of heavy elements like rare-earth metals is a fundamental question for which direct evidence was found by observation of the gravitational-wave signal GW170817 and its associated kilonova electromagnetic transient. This established the r-process in binary neutron-star merger events for fast synthesis of heavy elements [1]. Mass accumulation due to neutron captures and associated fast beta-decays terminates in the actinide region when fission reactions start to compete. Fission fragments then form the new seed nuclei for the r-process. Detailed models of the r-process require reliable fission models. However, experimental data on nuclear fission as a function of excitation energy is scarce. To increase our understanding of the impact of fission to the r-process, a new setup for electron-induced fission is under development at the S-DALINAC at TU Darmstadt. Combining the large acceptance QCLAM spectrometer with fission fragment detectors allows for a coincident measurement of excitation energy and masses of both fragments. In this contribution, the development of the experimental setup and future physics cases will be discussed.
This work is supported by the State of Hesse within the Research Cluster ELEMENTS (Project ID No. 500/10.006).
[1] J. J. Cowan et al., Rev. Mod. Phys. 93, 015002 (2021).
Keywords: electrofission; r-process; nucleosynthesis; fission; actinides