{"oa":1,"volume":93,"month":"03","user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","publisher":"American Physical Society","type":"journal_article","language":[{"iso":"eng"}],"publication":"Physical Review A - Atomic, Molecular, and Optical Physics","title":"Relativistic evaluation of the two-photon decay of the metastable 1s22s2p3P0 state in berylliumlike ions with an effective-potential model","department":[{"_id":"MiLe"}],"abstract":[{"text":"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.","lang":"eng"}],"doi":"10.1103/PhysRevA.93.032502","author":[{"full_name":"Amaro, Pedro","last_name":"Amaro","first_name":"Pedro"},{"full_name":"Fratini, Filippo","last_name":"Fratini","first_name":"Filippo"},{"first_name":"Laleh","full_name":"Safari, Laleh","last_name":"Safari","id":"3C325E5E-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Jorge","full_name":"Machado, Jorge","last_name":"Machado"},{"first_name":"Mauro","last_name":"Guerra","full_name":"Guerra, Mauro"},{"last_name":"Indelicato","full_name":"Indelicato, Paul","first_name":"Paul"},{"last_name":"Santos","full_name":"Santos, José","first_name":"José"}],"_id":"1496","day":"07","ec_funded":1,"quality_controlled":"1","acknowledgement":"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. ","status":"public","citation":{"ieee":"P. Amaro <i>et al.</i>, “Relativistic evaluation of the two-photon decay of the metastable 1s22s2p3P0 state in berylliumlike ions with an effective-potential model,” <i>Physical Review A - Atomic, Molecular, and Optical Physics</i>, vol. 93, no. 3. American Physical Society, 2016.","chicago":"Amaro, Pedro, Filippo Fratini, Laleh Safari, Jorge Machado, Mauro Guerra, Paul Indelicato, and José Santos. “Relativistic Evaluation of the Two-Photon Decay of the Metastable 1s22s2p3P0 State in Berylliumlike Ions with an Effective-Potential Model.” <i>Physical Review A - Atomic, Molecular, and Optical Physics</i>. American Physical Society, 2016. <a href=\"https://doi.org/10.1103/PhysRevA.93.032502\">https://doi.org/10.1103/PhysRevA.93.032502</a>.","ama":"Amaro P, Fratini F, Safari L, et al. Relativistic evaluation of the two-photon decay of the metastable 1s22s2p3P0 state in berylliumlike ions with an effective-potential model. <i>Physical Review A - Atomic, Molecular, and Optical Physics</i>. 2016;93(3). doi:<a href=\"https://doi.org/10.1103/PhysRevA.93.032502\">10.1103/PhysRevA.93.032502</a>","mla":"Amaro, Pedro, et al. “Relativistic Evaluation of the Two-Photon Decay of the Metastable 1s22s2p3P0 State in Berylliumlike Ions with an Effective-Potential Model.” <i>Physical Review A - Atomic, Molecular, and Optical Physics</i>, vol. 93, no. 3, 032502, American Physical Society, 2016, doi:<a href=\"https://doi.org/10.1103/PhysRevA.93.032502\">10.1103/PhysRevA.93.032502</a>.","ista":"Amaro P, Fratini F, Safari L, Machado J, Guerra M, Indelicato P, Santos J. 2016. Relativistic evaluation of the two-photon decay of the metastable 1s22s2p3P0 state in berylliumlike ions with an effective-potential model. Physical Review A - Atomic, Molecular, and Optical Physics. 93(3), 032502.","short":"P. Amaro, F. Fratini, L. Safari, J. Machado, M. Guerra, P. Indelicato, J. Santos, Physical Review A - Atomic, Molecular, and Optical Physics 93 (2016).","apa":"Amaro, P., Fratini, F., Safari, L., Machado, J., Guerra, M., Indelicato, P., &#38; Santos, J. (2016). Relativistic evaluation of the two-photon decay of the metastable 1s22s2p3P0 state in berylliumlike ions with an effective-potential model. <i>Physical Review A - Atomic, Molecular, and Optical Physics</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevA.93.032502\">https://doi.org/10.1103/PhysRevA.93.032502</a>"},"main_file_link":[{"open_access":"1","url":"http://arxiv.org/abs/1508.06169"}],"publist_id":"5683","issue":"3","intvolume":"        93","scopus_import":1,"project":[{"grant_number":"291734","call_identifier":"FP7","_id":"25681D80-B435-11E9-9278-68D0E5697425","name":"International IST Postdoc Fellowship Programme"}],"date_published":"2016-03-07T00:00:00Z","publication_status":"published","year":"2016","oa_version":"Preprint","date_created":"2018-12-11T11:52:21Z","article_number":"032502","date_updated":"2021-01-12T06:51:09Z"}