Observation of the 2p_3/2 2s_1/2 intra-shell transition in He-like uranium

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

Corresponding author: martino.trassinelli@insp.jussieu.fr

Received: 8 August 2009
Accepted: 10 September 2009

Abstract

We present the first observation of the 1s2p ³P₂ 1s2s  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 1s²2p ²P_3/2 1s²2s  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.