Rostock 2019 – scientific programme

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MS: Fachverband Massenspektrometrie

MS 9: Resonance Ionization Mass Spectrometry

MS 9.1: Invited Talk

Thursday, March 14, 2019, 14:00–14:30, U A-Esch 2

Precision Spectroscopy of Boron Atoms — •Bernhard Maaß¹, Jason Clark², Thomas Hüther¹, Phillip Imgram¹, Simon Kaufmann¹, Kristian König¹, Jörg Krämer¹, Jan Krause¹, Alessandro Lovato², Peter Müller², Krzysztof Pachucki³, Mariusz Puchalski³, Robert Roth¹, Rodolfo Sánchez⁴, Guy Savard², Robert Wiringa², and Wilfried Nörtershäuser¹ — ¹IKP, TU Darmstadt, DE — ²ANL, Lemont, IL, USA — ³University of Warsaw, PL — ⁴GSI Darmstadt, DE

We report on the first determination of the nuclear charge radius of stable boron isotopes by resonance ionization mass spectrometry (RIMS). By combining high-resolution measurements of the isotope shift in an atomic ground state transition and high-accuracy ab initio mass-shift calculations of the five-electron system, the difference in the mean-square charge radius between the stable isotopes ^10,11B can be extracted. The result is then used to benchmark new ab initio nuclear structure calculations using the no-core shell model and Greens-Function Monte Carlo approaches. In near future, collinear laser spectroscopy will be performed in the same transition on the short-lived (770 ms) proton halo candidate ⁸B at Argonne National Laboratory. The difference in mean-square charge radius will deliver a model-independent test of its proton halo character.

This work is supported by the U.S. DOE, Office of Science, Office of Nuclear Physics, under contract DE-AC02-06CH1135, and by the Deutsche Forschungsgemeinschaft through Grant SFB 1245.