Volume 87, Number 6, September 2009
Article Number 63001
Number of page(s) 6
Section Atomic, Molecular and Optical Physics
Published online 09 October 2009
EPL, 87 (2009) 63001
DOI: 10.1209/0295-5075/87/63001

Observation of the 2p3/2 $\rightarrow$ 2s1/2 intra-shell transition in He-like uranium

M. Trassinelli1, 2, A. Kumar2, 3, H. F. Beyer2, P. Indelicato4, R. Märtin2, 5, R. Reuschl1, 2, Y. S. Kozhedub6, C. Brandau2, H. Bräuning2, S. Geyer2, A. Gumberidze2, S. Hess2, P. Jagodzinski7, C. Kozhuharov2, D. Liesen2, U. Spillmann2, S. Trotsenko2, G. Weber2, 5, D. F. A. Winterseak2, 5 and Th. Stöhlker2, 5

1   CNRS, UMR 7588, INSP, Campus Boucicaut - 140 rue de Lourmel, Paris, 75015 France, EU and Université Pierre et Marie Curie-UPMC, UMR 7588, INSP, Campus Boucicaut - 140 rue de Lourmel, Paris, 75015 France, EU
2   GSI Helmholtzzentrum für Schwerionenforschung GmbH - Planckstraße 1, 64291 Darmstadt, Germany, EU
3   Nuclear Physics Division, Bhabha Atomic Research Centre - Mumbai, 400 085, India
4   Laboratoire Kastler Brossel, École Normale Supérieure; CNRS; Université Pierre et Marie Curie-Paris 6 Case 74, 4 Place Jussieu, 75005 Paris, France, EU
5   Physikalisches Institut, Universität Heidelberg - Philosophenweg 12, 69120 Heidelberg, Germany, EU
6   Department of Physics, St. Petersburg State University - Oulianovskaya 1, Petrodvorets, St. Petersburg 198504, Russia
7   Institute of Physics, Jan Kochanowski University - ul. Świetokrzyska 15, 25406 Kielce, Poland, EU

received 8 August 2009; accepted in final form 10 September 2009; published September 2009
published online 9 October 2009

We present the first observation of the 1s2p3P2 $\rightarrow$ 1s2s3S1 transition in He-like uranium. The experiment was performed at the internal gas-jet target of the ESR storage ring at GSI exploiting a Bragg crystal spectrometer and a germanium solid-state detector. Using the 1s22p2P3/2 $\rightarrow$ 1s22s 2S1/2 transition in Li-like uranium as reference and the deceleration capabilities of the ESR storage ring, we obtained the first evaluation of the energy of an intra-shell transition for a He-like heavy ion.

32.30.Rj - X-ray spectra.
31.30.J- - Relativistic and quantum electrodynamic (QED) effects in atoms, molecules, and ions.
12.20.Fv - Experimental tests.

© EPLA 2009