Two-photon decay in silver and hafnium atoms

Ilakovac, Ksenofont and Horvat, V. and Krečak, Z. and Jerbić-Zorc, Gorjana and Ilakovac, N. and Bokulić, T. (1992) Two-photon decay in silver and hafnium atoms. Physical Review A, 46 (1). pp. 132-141. ISSN 1050-2947

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The decay of silver and hafnium atoms with a vacancy in the K shell by the emission of photon pairs which continuously share the transition energy was studied. Radioactive decay of 109Cd and of 179Ta was used to generate K-shell vacancy states in silver and hafnium atoms, respectively. A pair of germanium detectors in a 180° geometry and a fast-slow coincidence system with a (128×512×512)-channel three-parameter pulse-height analyzer were used in the measurements. Two-dimensional spectra of numbers of events as functions of amplitudes of coincident pulses from the two detectors were analyzed. Surface fitting of two-dimensional spectra and curve fitting of sum spectra were applied to deduce the number of events. The differential transition probabilities of 2s→1s, 3s→1s, 3d→1s, and 4sd→1s two-photon decay per decay of a K-shell vacancy have been determined. For silver they are compared with the results of relativistic self-consistent-field calculations of Mu and Crasemann [Phys. Rev. A 38, 4585 (1988)] and of Tong, Li, Kissel, and Pratt [Phys. Rev. A 42, 1442 (1990)]. The results for silver and hafnium are compared with the results of nonrelativistic calculations for hydrogenic silver and hafnium ions. The 3d→1s two-photon decays show the resonance effect, in accordance with the theoretical predictions.

Item Type: Article
Date: July 1992
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (1992) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 08 Jul 2014 08:29
Last Modified: 08 Jul 2014 08:29

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