München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 22: Structure and Dynamics of Nuclei IV

HK 22.1: Gruppenbericht

Dienstag, 19. März 2019, 14:00–14:30, HS 16

Towards Laser Spectroscopy of Boron-8 — •Felix Sommer1, Jason Clark2, Phillip Imgram1, Simon Kaufmann1, Kristian König1, Jörg Krämer1, Jan Krause1, Alessandro Lovato2, Bernhard Maaß1, Peter Müller2, Krzysztof Pachucki5, Mariusz Puchalski6, Maria Piarulli3, Robert Roth1, Rodolfo Sánchez4, Guy Savard2, Robert Wiringa2, and Wilfried Nörtershäuser11TU Darmstadt, DE — 2ANL, Lemont, IL, US — 3Washington University, St. Louis, MO, US — 4GSI, Darmstadt, DE — 5University of Warsaw, PL — 6AM University, Poznan, PL

We report on the status of the charge radius determination of the proton halo candidate 8B via collinear laser spectroscopy at Argonne National Laboratory. 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 mean-square charge radii between the short-lived 8B and the stable isotopes 10,11B can be extracted and will deliver a model-independent test of the 8B proton halo character. In preparation, we installed a collinear laser spectroscopy beamline at ANL and investigated the production of 8B-ions, including molecule breakup through few-nm carbon foils. Furthermore, we determined the nuclear charge radii of the stable boron isotopes 10,11B by resonance ionization mass spectrometry (RIMS) at TU Darmstadt.

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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