Phys. Rev. C 71, 054320 (2005) [7 pages]Precise measurement of K-shell fluorescence yield in iridium: An improved test of internal-conversion theoryReceived 27 January 2005; published 27 May 2005 We have measured the total intensity of K x rays relative to 129.4-keV γ rays from decay of the second excited state in 191Ir. This (M1+E2) transition was observed following the β decay of 15.4-d 191Os. Our measured ratio yields the result αKωK=2.044(11). When combined with a recent measurement of the same ratio for the 80.2-keV M4 transition from 193Irm, this result strongly confirms the need for the K-shell hole to be included in calculations of internal-conversion coefficients αK. Since the αK value calculated for the 191Ir transition is virtually independent of the hole treatment, our result also yields a model-independent value for the iridium fluorescence yield, ωK=0.954(9). © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.71.054320
DOI:
10.1103/PhysRevC.71.054320
PACS:
23.20.Nx, 27.80.+w
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