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HK: Fachverband Physik der Hadronen und Kerne

HK 21: Structure and Dynamics of Nuclei V

HK 21.6: Vortrag

Mittwoch, 18. März 2026, 15:15–15:30, AM 00.011

Investigating molecular formation and breakup towards measurements of the halo candidate ⁸B — •Julien Spahn¹, Jason Clark², Bernhard Maaß², Peter Müller², Wilfried Nörtershäuser¹, and Guy Savard² — ¹Institute for nuclear physics, TU Darmstadt, Germany — ²Physics division, Argonne National Laboratory, USA

Since the first discovery of halo nuclei, neutron halos in particular have been characterized using nuclear reactions and laser spectroscopy. A measurement of the nuclear charge radius of the more exotic proton halo in the isotope ⁸B, however, is still pending. An ongoing effort at Argonne’s ATLAS facility aims to investigate ⁸B via collinear laser spectroscopy. However, ⁸B ions readily form molecules with residual contaminants in the He buffer gas of the gas catcher used to cool and extract the ions. These molecular species reduce the yield of the pure (bunched) ⁸B beam. This contribution will focus on the commissioning of a new setup allowing investigation of the beam composition in continuous and bunched mode, relying on neural network based analysis of alpha decays detected via an MCP behind a velocity filter. Additionally, first results from online experiments investigating the molecular formation in the gas catcher and the breakup of the formed molecules in the RFQ will be presented.
This project was supported by DFG (Project-ID 279384907 - SFB 1245) and by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357, with resources of ANL’s ATLAS facility, an Office of Science User Facility.

Keywords: proton halo; collinear laser spectroscopy; molecules; charge exchange