Bound internal conversion versus nuclear excitation by electron transition: Revision of the theory of optical pumping of the Th229m isomer

F. F. Karpeshin and M. B. Trzhaskovskaya
Phys. Rev. C 95, 034310 – Published 13 March 2017

Abstract

Two-photon optical pumping of the 7.6-eV nuclear isomer in the singly ionized atoms of Th229 is considered. Differences between two mechanisms of the pumping, nuclear excitation in the electronic transition (NEET) and bound internal conversion (BIC), are derived and analyzed numerically. The BIC mechanism turns out to be more effective, by orders of magnitude, in accordance with previous calculations. Moreover, a numerical smallness in the NEET scheme is explicitly pointed out concerning singly and doubly charged ions. That is related to the smallness of the final vertex, responsible for conservation of energy. In the case of BIC, the calculated pumping rate of the isomer for the most effective scheme may be as high as 0.03s1.

  • Figure
  • Figure
  • Received 4 November 2016
  • Revised 28 January 2017

DOI:https://doi.org/10.1103/PhysRevC.95.034310

©2017 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & AstrophysicsGeneral PhysicsNuclear PhysicsInterdisciplinary PhysicsAtomic, Molecular & Optical

Authors & Affiliations

F. F. Karpeshin1,* and M. B. Trzhaskovskaya2

  • 1D. I. Mendeleev Institute for Metrology, 190005 Saint-Petersburg, Russia
  • 2National Research Center “Kurchatov Institute”, Petersburg Nuclear Physics Institute, Gatchina 188300, Russia

  • *fkarpeshin@gmail.com

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Issue

Vol. 95, Iss. 3 — March 2017

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