A gas-jet apparatus for high-resolution laser spectroscopy on the heaviest elements at SHIP

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

卷:463

Article; Proceedings Paper

Raeder, S.^1,2  Block, M.^1,2,3  Chhetri, P.^1,4  Ferrer, R.⁵  Kraemer, S.⁵  Kron, T.^1,2  Laatiaoui, M.^2,3  Nothhelfer, S.³  Schneider, F.^2,3  Van Duppen, P.⁵  Verlinde, M.⁵  Verstraelen, E.⁵  Walther, Th.⁴  Zadvornaya, A.⁵ 

[1] GSI Helmholtzzentrum Schwerionenforsch, Planckstr 1, D-64291 Darmstadt, Germany

[2] Helmholtz Inst Mainz, Staudingerweg 18, D-55128 Mainz, Germany

[3] Johannes Gutenberg Univ Mainz, Inst Kernchem, Fritz Strassmann Weg 2, D-55128 Mainz, Germany

[4] Tech Univ Darmstadt, Schlossgartenstr 7, D-64289 Darmstadt, Germany

[5] Katholieke Univ Leuven, Inst Kern Stralingfys, Celestijnenlaan 200D, B-3001 Leuven, Belgium

关键词: Resonance ionization spectroscopy;    Gas stopping cell;    Gas jet;    Nobelium;   

DOI  :  10.1016/j.nimb.2019.05.016

来源: Elsevier

【 摘 要 】

Laser spectroscopy enables the determination of fundamental atomic and nuclear properties with high precision. In view of the low production rates of the heaviest elements, a high total efficiency is a crucial requirement for any experimental setup to be used in on-line experiments. The setup requires the use of gas stopping techniques to slow down the radionuclides of interest. In previous studies laser spectroscopy was performed inside a gas. filled stopping cell with a limited spectral resolution of a few GHz. Collisional broadening inside stopping cells ultimately limits the precision of laser spectroscopic studies and hampers in particular hyperfine spectroscopy. The spectral linewidth is reduced by an order of magnitude when the laser spectroscopy is performed in a well-collimated gas jet formed by the exit nozzle of a gas stopping cell. In addition, the exposure of the jet to high-repetition rate laser light which saturates the optical transitions allows maintaining a high total efficiency. Here, we present a new setup dedicated to laser spectroscopy of the heaviest elements with an improved resolution, which is presently under construction. This setup combines the efficient filament neutralization demonstrated for nobelium with the improved resolution of in-gas-jet spectroscopy.

【 授权许可】

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