Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 35: Poster: Precision spectroscopy of atoms and ions (with Q)

A 35.4: Poster

Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer

Towards investigations of highly charged rare and unstable isotopes — •Hendrik Bekker1, Michael Blessenohl1, Sergey Eliseev1, Klaus Werner2, Klaus Blaum1, and José R. Crespo López-Urrutia11Max-Planck-Institut für Kernphysik, Heidelberg — 2Eberhard Karls University, Tübingen

Highly charged ions of unstable isotopes are required for two new projects at the Heidelberg electron beam ion trap (HD-EBIT): (i) Within the framework of the ECHo collaboration the Penning-trap experiment PENTATRAP aims to measure the masses of 163Ho and 163Dy to high precision [1,2]. The Q-value of the electron capture process in 163Ho obtained in this way is an important input for the determinations of the electron neutrino mass. (ii) The lightest unstable element, technetium, was observed in S-type stars in 1952 already and was an important piece of evidence for nucleosynthesis [3]. Presently, spectroscopic data of highly charged technetium is required to further improve our understanding of stellar evolution and dynamics.

For the production of the required ions, the unstable isotopes need to be efficiently injected into HD-EBIT. To this end a wire probe injector [4] is currently under development, first results will be presented.

[1] L. Gastaldo et al., J. Low Temp. Physics., 876-884, 176 (2014)

[2] J. Repp et al., Appl. Phys. B 107 983 (2012)

[3] P.W. Merrill, The Astrophysical Journal 116 21 (1952)

[4] S.R. Elliot and R.E. Marrs, Nucl. Instrum. Methods B 100 529 (1995)

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