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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 Nörtershäuser11IKP, 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.

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