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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 8: Poster AKBP

AKBP 8.5: Poster

Mittwoch, 11. März 2026, 09:30–11:00, P4

Towards spectroscopic characterization of in-target gold fission fragments — •Syed A. Raza^1,2, Maximilian J. Weiser¹, Erin G. Fitzpatrick¹, Laura D. Geulig¹, and Peter G. Thirolf¹ — ¹Ludwig-Maximilians-Universität München, Garching, Germany — ²University of Bologna, Bologna, Italy

The fission fusion reaction mechanism aims to produce neutron-rich nuclei near the magic neutron number N = 126, which are important for understanding the r-process. A key prerequisite for enabling this mechanism is achieving high bunch densities of accelerated heavy ions, which is why laser-based acceleration is used [1].

In recent experiments at CALA on the acceleration of gold from 300-600 nm foils, using a Thomson parabola spectrometer and CR39 track detectors as diagnostics, we unexpectedly observed a heavy-ion component in the region of m/q = 2−2.5, where only light ions were expected. This component could be determined to be A ≈ 98 and attributed to in-target fission fragments [2].

In our experiment in order to unambiguously identify these heavy ions as Au fission fragments, we will use gold target foils (≈ 300nm−2 µm) at CALA and implement a down-stream Mylar catcher foil in front of TPS with a central hole on the target-normal axis to allow accelerated ions to reach the TPS, while the rest will be implanted in the catcher foil and transported out of the vacuum to a well-shielded HPGe detector for characterization of (long-lived) species.

[1] D.Habs et al., Appl. Phys. B 103, 471–484 (2011).

[2] L. D. Geulig, Dissertation LMU, Munich 2025

Keywords: Laser based acceleration; TNSA; Ultra high intensity laser; r-process; Fission fusion scheme