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Nuclear excitation by electronic transition in 189Os

Phys. Rev. C 61, 051304(R) – Published 21 April 2000
I. Ahmad, R. W. Dunford, H. Esbensen, D. S. Gemmell, E. P. Kanter, U. Rütt, and S. H. Southworth

Abstract

Monochromatic x rays have been used to explore the phenomenon of nuclear excitation by electronic transition (NEET) in the 189Os atomic/nuclear system. A new theoretical approach to calculating this process has also been developed and predicts a value for the “NEET probability,” PNEET, of 1.3×10-10. PNEET is the probability that a given atomic excitation (in this case a K vacancy), will result in the excitation of a specific nuclear state (in this case the 69.5-keV level in 189Os). This value is much lower than most of the calculated values given in the literature for this system. Our measurement gives the result PNEET<9×10-10, an upper limit which is several orders of magnitude lower than the values found in previous measurements, but which is consistent with the new calculation.

DOI: http://dx.doi.org/10.1103/PhysRevC.61.051304

  • Received 28 January 2000
  • Published 21 April 2000

© 2000 The American Physical Society

Authors & Affiliations

I. Ahmad, R. W. Dunford, H. Esbensen, D. S. Gemmell, E. P. Kanter, U. Rütt, and S. H. Southworth

  • Argonne National Laboratory, Argonne, Illinois 60439

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