Spectral Shape of the Two-Photon Decay of the $2\text{ }^{1}S_{0}$ State in He-Like Tin

Spectral Shape of the Two-Photon Decay of the $2 {}^{1}S_{0}$ State in He-Like Tin

S. Trotsenko, A. Kumar, A. V. Volotka, D. Banaś, H. F. Beyer, H. Bräuning, S. Fritzsche, A. Gumberidze, S. Hagmann, S. Hess, P. Jagodziński, C. Kozhuharov, R. Reuschl, S. Salem, A. Simon, U. Spillmann, M. Trassinelli, L. C. Tribedi, G. Weber, D. Winters, and Th. Stöhlker

Phys. Rev. Lett. 104, 033001 – Published 21 January 2010

Abstract

The spectral distribution of the $1 s 2 s {}^{1}S_{0} \to 1 s^{2} {}^{1}S_{0}$ two-photon decay of He-like tin was measured using a novel approach at the gas-jet target of the ESR storage ring. Relativistic collisions of Li-like projectiles with low-density gaseous matter have been exploited to selectively populate the desired $1 s 2 s$ state. Compared to conventional techniques, this approach results in a substantial gain in statistical and systematic accuracy, which allowed us to achieve for the first time a sensitivity to relativistic effects on the two-photon decay spectral shape as well as to discriminate the measured spectrum for Sn from theoretical shapes for different elements along the He-isoelectronic sequence.

Received 29 June 2008

DOI:https://doi.org/10.1103/PhysRevLett.104.033001

Authors & Affiliations

S. Trotsenko^1,2,3, A. Kumar², A. V. Volotka⁴, D. Banaś⁵, H. F. Beyer², H. Bräuning², S. Fritzsche², A. Gumberidze⁶, S. Hagmann^1,2, S. Hess^1,2, P. Jagodziński⁵, C. Kozhuharov², R. Reuschl⁷, S. Salem^1,2, A. Simon⁸, U. Spillmann², M. Trassinelli⁷, L. C. Tribedi⁹, G. Weber^2,10, D. Winters², and Th. Stöhlker^2,3,10,*

¹Institut für Kernphysik, Universität Frankfurt, D-60438 Frankfurt, Germany
²GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
³Helmholtz-Institut Jena, D-07743 Jena, Germany
⁴Institut für Theoretische Physik, Technische Universität Dresden, D-01062, Dresden, Germany
⁵Institute of Physics, Jan Kochanowski University, 25-406 Kielce, Poland
⁶ExtreMe Matter Institute EMMI, GSI, D-64291 Darmstadt, Germany
⁷Institut des Nanosciences de Paris, CNRS and Université Pierre et Marie Curie-Paris 6, 75015 Paris, France
⁸Institute of Physics, Jagiellonian University, Kraków, Poland
⁹Tata Institute of Fundamental Research, Mumbai, India
¹⁰Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, D-69120 Heidelberg, Germany

^*t.stoehlker@gsi.de

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Vol. 104, Iss. 3 — 22 January 2010

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Physical Review Letters

Spectral Shape of the Two-Photon Decay of the 2 S01 State in He-Like Tin

S. Trotsenko, A. Kumar, A. V. Volotka, D. Banaś, H. F. Beyer, H. Bräuning, S. Fritzsche, A. Gumberidze, S. Hagmann, S. Hess, P. Jagodziński, C. Kozhuharov, R. Reuschl, S. Salem, A. Simon, U. Spillmann, M. Trassinelli, L. C. Tribedi, G. Weber, D. Winters, and Th. Stöhlker

Phys. Rev. Lett. 104, 033001 – Published 21 January 2010

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Spectral Shape of the Two-Photon Decay of the $2 {}^{1}S_{0}$ State in He-Like Tin