Journal Article

GSI-2022-00567

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png X-ray emission associated with radiative recombination for $Pb^{82+}$ ions at threshold energies

Zhu, B. (Corresponding author)HIJ* ; Gumberidze, A.GSI* ; Over, T.HIJ* ; Weber, G.GSI* ; Andelkovic, Z.GSI* ; Bräuning-Demian, A.GSI* ; Chen, R. J.GSI* ; Dmytriiev, D. ; Forstner, O.GSI* ; Hahn, C.GSI* ; Herfurth, F.GSI* ; Herdrich, M. O. ; Hillenbrand, P.-M.GSI* ; Kalinin, A.GSI* ; Kröger, F. M.HIJ* ; Lestinsky, M.GSI* ; Litvinov, Y. A.GSI* ; Menz, E. B.GSI* ; Middents, W.HIJ* ; Morgenroth, T.GSI* ; Petridis, N.GSI* ; Pfäfflein, P.GSI* ; Sanjari, M. S.GSI* ; Sidhu, R. S.GSI* ; Spillmann, U.GSI* ; Schuch, R. ; Schippers, S. ; Trotsenko, S.GSI* ; Varga, L. ; Vorobyev, G.GSI* ; Stöhlker, T.GSI*

2022
APS Woodbury, NY

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Please use a persistent id in citations: doi:10.1103/PhysRevA.105.052804  doi:10.15120/GSI-2022-00567

Report No.: arXiv:2201.06977

Abstract: For bare lead ions, decelerated to the low beam energy of 10 MeV/u, the x-ray emission associated with radiative recombination (RR) at 'cold collision' conditions has been studied at the electron cooler of CRYRING@ESR at GSI-Darmstadt. Utilizing dedicated x-ray detection chambers installed at 0° and 180° observation geometry, we observed for the very first time for stored ions the full x-ray emission spectrum associated with RR under electron cooling conditions. Most remarkably, no line distortion effects due to delayed emission are present in the well resolved spectra, spanning over a wide range of x-ray energies (from about 5 to 100 keV) which enable to identify fine-structure resolved Lyman, Balmer as well as Paschen x-ray lines along with the RR transitions into the K-, L and M-shell of the ions. To compare with theory, an elaborate theoretical model has been applied. By considering the relativistic atomic structure of Pb$^{81+}$, this model is based on a sophisticated computation of the initial population distribution via RR for all atomic levels up to Rydberg states with principal quantum number $n=$ 165 in combination with cascade calculations based on time-dependent rate equations. Within the statistical accuracy, the experimental x-ray line emission is in very good agreement with the results of the theoretical model applied. Most notably, this comparison sheds light on the contribution of prompt and delayed X-ray emission (up to 70 ns) to the observed X-ray spectra, originating in particular from Yrast transitions into inner shells.

Keyword(s): Atomic Physics (physics.atom-ph) ; FOS: Physical sciences

Note: ISSN 2469-9934 not unique: **2 hits**. Supported by ERC under grant agreement # 6544002. Supported by BMBF under grant # 5P19SJFAA and 05P19RGFA1.

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Contributing Institute(s):

1. HI Jena (HIJ)
2. Atom-, Quanten- & Fundamentalphysik (ATP)
3. Deceleratoren (DEC)
4. Helmholtz ForschAkad Hess. f. FAIR, HFHF (FHF)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. ASTRUm - Astrophysics with Stored Highy Charged Radionuclides (682841) (682841)
3. FAIR Phase-0 - FAIR Phase-0 Research Program (GSI-FAIR-Phase-0) (GSI-FAIR-Phase-0)
4. SUC-GSI-Giessen - Strategic university cooperation GSI-U Gießen (SUC-GSI-GI) (SUC-GSI-GI)
5. Atomics, plasma and applied physics - Experiment (HFHF project) (I:(DE-Ds200)HFHF-AP) (I:(DE-Ds200)HFHF-AP)

Experiment(s):

1. E138: E138 The Ground-State Lamb Shift in the Heaviest Hydrogen-like Ion (U91+): High Resolution X-ray Spectroscopy at the CRYRING Electron Cooler (Station: ESR-CRY)

Appears in the scientific report 2022

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