Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 6: Structure and Dynamics of Nuclei I

HK 6.5: Vortrag

Montag, 30. März 2020, 17:45–18:00, J-HS E

Collinear and anti-collinear laser spectroscopy measurements on He-like 11B and 10B — •A. Buss1, Z. Andelkovic2, V. M. Hannen1, P. Imgram3, K. Mohr3, R. Sánchez2, W. Nörtershäuser3, C. Weinheimer1, B. Maass3, K. König4, J. Krämer3, and S. Rausch31IKP, WWU Münster — 2GSI, Darmstadt — 3IKP, TU Darmstadt — 4NSCL, MSU

We present preliminary results of hyperfine spectroscopy measurements on He-like boron atoms. In particular, experimental results for 11B and previously unobserved HFS transitions in 10B are presented.

The measurements have been performed at the HITRAP facility, using a local ion source and a beam line leading to the SPECTRAP experiment. A downscaled version of the CRYRING fluorescence detector was installed on top of the SPECTRAP magnet. The detector was built as a general purpose detector for collinear and anti-collinear laser spectroscopy experiments and is able to detect fluorescence photons in a wavelength range from 250 nm to 900 nm. Together with a frequency doubled continous wave laser system, the setup enables high precision measurements of the hyperfine transitions 1s2s  3S1 → 1s2p  3P0,1,2. The metastable 3S1 state in 11B and 10B is populated in an up to now unknown fraction of the ions produced in the local electron beam ion source (EBIS). Uncertainties in the ions’ acceleration voltage can be eliminated by combining collinear and anti-collinear measurements of the same transition and therefore allow a precise determination of the transition wavelengths. This work is supported by BMBF under contract numbers 05P19PMFA1 and 05P19RDFAA.

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