Resonance effect in inner-shell nd -> 1s two-photon decay

Ilakovac, Ksenofont (1992) Resonance effect in inner-shell nd -> 1s two-photon decay. Fizika B, 1 (1). pp. 71-82. ISSN 1330-0016

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Abstract

Emission of photon pairs by the two-photon decay process from silver and hafnium atoms with a vacancy in the K shell was investigated. Radioactive decay of 109^Cd and 179^Ta was used to generate the K-shell vacancy states in silver and hafnium atoms, respectively. The measuring system consisted of a pair of planar high-purity germanium detectors, a fast-slow coincidence system, and a 128x512x512 channel pulse-height analyzer. Two-dimensional spectra of numbers of events as functions of amplitudes of coincident pulses from the two detectors were analyzed. The results on the 3d -> 1s two-photon decay show the resonance behaviour, seen as a gradual increase of the differential transition probability as the partition of energy among the two photons of the pair deviates from equal-energy partition (E_1=E_2=E0/2). The effect was predicted by the second-order perturbation theory of two-photon decay in which summation over intermediate states is carried out over occupied and unoccupied bound states, and over unbound states.

Item Type: Article
Date: 1992
Subjects: NATURAL SCIENCES > Physics
Divisions: Faculty of Science > Department of Physics
Publisher: Hrvatsko fizikalno društvo
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 08 Mar 2014 17:09
Last Modified: 08 Mar 2014 20:52
URI: http://digre.pmf.unizg.hr/id/eprint/529

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