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Two-photon decay in strong central fields observed for the case of He-like gold

Authors:	H W Schffer P H Mokler R W Dunford C Kozhuharov A Krmer A E Livingston T Ludziejewski H -T Prinz P Rymuza L Sarkadi Z Stachura Th Sthlker P Swiat A Warczak

Institution:	^a Gesellschaft für Schwerionenforschung, 64291 Darmstadt, Germany;^b I. Physikalisches Institut, Justus-Liebig-Universität, 35392 Giessen, Germany;^c Chemistry Divison, Argonne Nat. Lab., Argonne, Il 60439, USA;^d Institut für Kernphysik, University of Frankfurt, 60486 Frankfurt, Germany;^e Notre Dame University, Notre Dame (IN 46556), USA;^f Institute for Nuclear Studies, 05-400 wierk, Poland;^g Institute for Nuclear Research, (4001) Debrecen, Hungary;^h Institute of Nuclear Physics, 31-342 Cracow, Poland;ⁱ Institute of Physics, Jagiellonian University, 30-059 Cracow, Poland

Abstract:	The photon energy differential shape of the second order matrix element for the two-photon (2E1) decay of the 1s2s¹S₀ level in He-like gold has been measured. The results are in agreement with a recent fully relativistic calculation. The corresponding 2E1 matrix element deviates from those in lighter He-like systems due to the strong central field in a heavy two-electron ion.

Keywords:	PACS classification codes: 32 70 Fw 31 30 Jv 31 10 +z 32 30 Rj
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