Mainz 2017 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 9: Precision Spectroscopy II
A 9.4: Vortrag
Montag, 6. März 2017, 17:45–18:00, N 3
Towards Laser Spectroscopy of Boron-8 — •Bernhard Maaß1, Peter Müller2, Jason Clark2, Christian Gorges1, Simon Kaufmann1, Kristian König1, Jörg Krämer1, Anthony Levand2, Rodney Orford2, Rodolfo Sánchez3, Guy Savard2, Felix Sommer1, and Wilfried Nörtershäuser1 — 1IKP,TU Darmstadt, DE — 2ANL, Chicago, IL, USA — 3GSI Darmstadt, DE
The BOR8 experiment aims at the determination of the nuclear charge radius of boron-8 with high-resolution laser spectroscopy. 8B is perhaps the best candidate of a nucleus exhibiting an extended proton wave-function or one-proton-halo. The charge radius, which is directly correlated with the extent of the proton wave function, can be extracted from the measured isotope shift along the boron isotopic chain. Atomic theory calculations of the five-electron system, which were recently carried out, pave the way for targeting neutral boron atoms, whose spectroscopic properties are well suited for such measurements. In-flight production and preparation of sufficient yields of 8B ions at low energies are provided by the Argonne Tandem Linac Accelerator System (ATLAS) at Argonne National Laboratory (ANL). In a first off-line experiment, the isotope shift of the stable isotopes 10,11B have been measured with resonance ionization mass spectrometry. This delivers a valuable test not only of atomic theory, but also of experimental equipment which will later be used at ANL.
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.