Relativistic evaluation of the two-photon decay of the metastable 1s22s2p3P0 state in berylliumlike ions with an effective-potential model Journal Article


Author(s): Amaro, Pedro; Fratini, Filippo ; Safari, Laleh; Machado, Jorge; Guerra, Mauro; Indelicato, Paul; Santos, José P
Article Title: Relativistic evaluation of the two-photon decay of the metastable 1s22s2p3P0 state in berylliumlike ions with an effective-potential model
Affiliation IST Austria
Abstract: The two-photon 1s2 2s 2p 3P0 1s22s2 1S0 transition in berylliumlike ions is theoretically investigated within a fully relativistic framework and a second-order perturbation theory. We focus our analysis on how electron correlation, as well as the negative-energy spectrum, can affect the forbidden E1M1 decay rate. For this purpose, we include the electronic correlation via an effective local potential and within a single configuration-state model. Due to its experimental interest, evaluations of decay rates are performed for berylliumlike xenon and uranium. We find that the negative-energy contribution can be neglected at the present level of accuracy in the evaluation of the decay rate. On the other hand, if contributions of electronic correlation are not carefully taken into account, it may change the lifetime of the metastable state by up to 20%. By performing a full-relativistic jj-coupling calculation, we found a decrease of the decay rate by two orders of magnitude compared to non-relativistic LS-coupling calculations, for the selected heavy ions.
Journal Title: Physical Review A - Atomic, Molecular, and Optical Physics
Volume: 93
Issue 3
ISSN: 1094-1622
Publisher: American Physical Society  
Date Published: 2016-03-07
Start Page: Article Number: 032502
URL:
DOI: 10.1103/PhysRevA.93.032502
Notes: This research was supported in part by FCT, Portugal, through Project No. PTDC/FIS/117606/2010, financed by the European Community Fund FEDER through the COMPETE. P.A., J.M., and M.G. acknowledge support from FCT, under Contracts No. SFRH/BPD/92329/2013, No. SFRH/BD/52332/2013, and No.SFRH/BPD/92455/2013. F.F. acknowledges support from the Austrian Science Fund through START Grant No. Y 591-N16. L.S. acknowledges financial support from the People Programme (Marie Curie Actions) of the European Union’s Seventh Framework Programme (Program No. FP7/2007-2013) under REA Grant Agreement No. 291734. P.I. acknowledges the support as a Helmholtz Alliance HA216/EMMI member. Laboratoire Kastler Brossel is “UMR n ◦ 8552” of the Ecole Normale Superieure, CNRS, College de France and Sorbonne University - Universiy Pierre and Marie Curie-Paris 06.
Open access: yes (repository)