The extraction of 229Th3+ from a buffer-gas stopping cell

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:376

Article; Proceedings Paper

v. d. Wense, L.¹  Seiferle, B.¹  Laatiaoui, M.^2,3  Thirolf, P. G.¹ 

[1] Univ Munich, Coulombwall 1, Garching, Germany

[2] GSI Helmholtzzentrum Schwerionenforsch GmbH, Planckstr 1, Darmstadt, Germany

[3] Helmholtz Inst Mainz, Johann Joachim Becherweg 36, Mainz, Germany

关键词: Th-229 isomer;    Atomic clock;    Nuclear clock;    Buffer-gas stopping cell;    Quadrupole mass separator;   

DOI  :  10.1016/j.nimb.2015.12.049

来源: Elsevier

【 摘 要 】

In the whole landscape of atomic nuclei, Th-229 is currently the only known nucleus which could allow for the development of a nuclear-based frequency standard, as it possesses an isomeric state of just 7.6 eV energy above the ground state. The 3+ charge state is of special importance in this context, as Th3+ allows for a simple laser-cooling scheme. Here we emphasize the direct extraction of triply-charged Th-229 from a buffer-gas stopping cell. This finding will not only simplify any future approach of Th-229 ion cooling, but is also used for thorium-beam purification and in this way provides a powerful tool for the direct identification of the Th-229 isomer to ground state nuclear transition. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

Free