TY - JOUR
T1 - X-ray emission associated with radiative recombination for Pb82+ ions at threshold energies
AU - Zhu, B.
AU - Gumberidze, A.
AU - Over, T.
AU - Weber, G.
AU - Andelkovic, Z.
AU - Bräuning-Demian, A.
AU - Chen, R. J.
AU - Dmytriiev, D.
AU - Forstner, O.
AU - Hahn, C.
AU - Herfurth, F.
AU - Herdrich, M.O.
AU - Hillenbrand, P.-M.
AU - Kalinin, A.
AU - Kröger, F. M.
AU - Letinsky, M.
AU - Litvinov, Yu. A.
AU - Menz, E.B.
AU - Middents, W.
AU - Morgenroth, T.
AU - Petridis, N.
AU - Pfafflein, Ph.
AU - Sanjari, M.S.
AU - Sidhu, R.S.
AU - Spillmann, U.
AU - Schuch, R.
AU - Schippers, S.
AU - Trotsenko, S
AU - Varga, L.
AU - Vorobyev, G.
AU - Stöhlker, Th.
N1 - Funding Information:
The substantial support provided by N. Angert, B. Franzke, R. Maier, and Ö. Skeppstedt to initiate the project CRYRING@ESR is acknowledged. The authors are indebted to the ESR team, M. Steck, S. Litvinov, B. Lorentz, and their colleagues, for providing us with an excellent beam. We wish to thank also S. Bernitt, C.-Y. Chen, and M.-F. Gu for fruitful discussions of the fac code. This research has been conducted in the framework of the SPARC collaboration, experiment E138 of FAIR Phase-0 supported by GSI. It is further supported by the Extreme Matter Institute EMMI and by the European Research Council (ERC) under the European Union's Horizon 2020 research as well as by the innovation program (Grant No. 682841 “ASTRUm”) and Grant Agreement No. 6544002, ENSAR2. B.Z. acknowledges Doctoral Fellowship 2018.9-2022.2 supported by Chinese Scholarship Council (Grant No. 201806180051). We also acknowledge the support provided by ErUM FSP T05 “Aufbau von APPA bei FAIR” (BMBF No. 05P19SJFAA and No. 05P19RGFA1).
Publisher Copyright:
© 2022 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
PY - 2022/5/10
Y1 - 2022/5/10
N2 - For decelerated bare lead ions at a low beam energy of 10 MeV/u, the x-ray emission associated with radiative recombination (RR) at threshold energies has been studied at the electron cooler of CRYRING@ESR at GSI, Darmstadt. In our experiment, we observed the full x-ray emission pattern by utilizing dedicated x-ray detection chambers installed at 0∘ and 180∘ observation geometry. Most remarkably, no line distortion effects due to delayed emission are present in the well-defined x-ray spectra, spanning a wide range of x-ray energies (from about 5 to 100 keV), which enables us to identify fine-structure resolved Lyman, Balmer, and Paschen x-ray lines along with the RR transitions into the K, L, and M shells of the ions. For comparison with theory, an elaborate theoretical model is established taking into account the initial population distribution via RR for all atomic levels up to Rydberg states with principal quantum number n=165 in combination with time-dependent feeding transitions. Within the statistical accuracy, the experimental data are in very good agreement with the results of rigorous relativistic predictions. 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.
AB - For decelerated bare lead ions at a low beam energy of 10 MeV/u, the x-ray emission associated with radiative recombination (RR) at threshold energies has been studied at the electron cooler of CRYRING@ESR at GSI, Darmstadt. In our experiment, we observed the full x-ray emission pattern by utilizing dedicated x-ray detection chambers installed at 0∘ and 180∘ observation geometry. Most remarkably, no line distortion effects due to delayed emission are present in the well-defined x-ray spectra, spanning a wide range of x-ray energies (from about 5 to 100 keV), which enables us to identify fine-structure resolved Lyman, Balmer, and Paschen x-ray lines along with the RR transitions into the K, L, and M shells of the ions. For comparison with theory, an elaborate theoretical model is established taking into account the initial population distribution via RR for all atomic levels up to Rydberg states with principal quantum number n=165 in combination with time-dependent feeding transitions. Within the statistical accuracy, the experimental data are in very good agreement with the results of rigorous relativistic predictions. 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.
UR - http://dx.doi.org/10.1103/physreva.105.052804
U2 - 10.1103/physreva.105.052804
DO - 10.1103/physreva.105.052804
M3 - Article
SN - 2469-9926
VL - 105
SP - 1
EP - 13
JO - Physical Review A
JF - Physical Review A
IS - 5
M1 - 052804
ER -