Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 6: Structure and Dynamics of Nuclei I

HK 6.4: Vortrag

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

Towards Laser Spectroscopy of Boron-8 — •Bernhard Maaß1, Jason Clark3, Phillip Imgram1, Kristian König2, Jörg Krämer1, Tim Lellinger1, Peter Müller3, Tim Ratajczyk1, Rodolfo Sánchez4, Guy Savard3, Felix Sommer1, and Wilfried Nörtershäuser11IKP, TU Darmstadt, DE — 2NSCL, East Lansing, MI, USA — 3ANL, Lemont, IL, USA — 4GSI, Darmstadt, DE

We report on our progress towards confirming the exotic structure of the proton-halo candidate 8B. So far, only model-dependent experimental evidence exists which suggests a strong increase in nuclear charge radius. This observable can be accessed model-independently by a laser-spectroscopic investigation, benchmarking not only the results of almost three decades of research, but also of nuclear theory approaches to model this exotic nucleus.

A precursor resonance laser ionization mass spectrometry experiment was performed on stable boron isotopes at TU Darmstadt, delivering the difference in mean-squared nuclear charge radius between 10B and 11B. It also proved the disposability of the atomic theory calculations which are necessary to interpret the results. Apart from the results of this experiment, updates from the ongoing effort to extend it to 8B at Argonne National Laboratory will be presented.

This work is supported by the U.S. DOE, Office of Science, Office of Nuclear Physics, under contract DE-AC02-06CH11357, and by the Deutsche Forschungsgemeinschaft through Grant SFB 1245.

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