The alignment of nuclear states resonantly formed in nuclear excitation by electron capture (NEEC) is studied by means of a density matrix technique. The vibrational excitations of the nucleus are described by a collective model and the electrons are treated in a relativistic framework. Formulas for the angular distribution of photons emitted in the nuclear relaxation are derived. We present numerical results for alignment parameters and photon angular distributions for a number of heavy elements in the case of E2 nuclear transitions. Our results are intended to help future experimental attempts to discern NEEC from radiative recombination, which is the dominant competing process.
A. Palffy et al., "Photon Angular Distribution and Nuclear-State Alignment in Nuclear Excitation by Electron Capture," Physical Review A - Atomic, Molecular, and Optical Physics, vol. 75, no. 1, pp. 012712-1-012712-9, American Physical Society (APS), Jan 2007.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevA.75.012712
Keywords and Phrases
Electromagnetic Waves; Electron Beams; Mathematical Models; Molecular Vibrations; Nuclear Energy; Parameter Estimation; Angular Distributions; Nuclear Excitation By Electron Capture (NEEC); Relativistic Framework; Photons
International Standard Serial Number (ISSN)
Article - Journal
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