Emission of gamma rays shifted from resonant absorption by electron-nuclear double transitions in ¹⁵¹EU²⁺:CaF₂

¹ Institute of Physics and Nuclear Engineering, Heavy-Ion Physics Department, 76900 Magurele, P.O. Box MG-6, Bucharest, Romania
² Department of Physics and Astronomy, Youngstown State University, Youngstown, Ohio 44555, USA
³ Center for Quantum Electronics, University of Texas at Dallas, P.O. Box 830688, Richardson, Texas 75083-0688, USA

Received: 31 July 1996
Accepted: 6 December 1996

Abstract

We show that the emission of a gamma-ray photon by a nucleus can be influenced by a microwave magnetic field acting on the atomic electrons. We study theoretically these electron-nuclear double transitions (ENDTs) for Eu nuclei in a lattice at low temperature, in the presence of a static magnetic field and of a microwave magnetic field. The ENDTs acquire a significant intensity for certain resonance frequencies. The ENDTs are of interest for the identification of the position of the lines in complex Mössbauer spectra.