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

Scientific paper - Original scientific paper

• Author: Ksenofont Ilakovac
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

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.

• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review
• Publication version: Published version
• Journal title: Fizika B
• Numbering: vol. 1, no. 1, pp. 71-82
• p-ISSN: 1330-0016
• URN:NBN: urn:nbn:hr:217:734558
• Publication: 1992
• Document URL: http://fizika.hfd.hr/fizika_b/bv92/b1p071.htm
• Type of resource: Text
• Access conditions: Open access
• Created on: 2019-10-02 15:16:17