Precise measurement of alpha(K) for the 88.2-keV M4 transition in Te-127: Test of internal-conversion theory
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2017 American Physical Society. We have measured the K-shell internal conversion coefficient, K, for the 88.2-keV M4 transition from the 106-day isomer to the ground state in Te127 to be 484(6). When compared with Dirac-Fock calculations of K, this result agrees well with the version of the theory that incorporates the effect of the K-shell atomic vacancy and disagrees with the one that does not. As a byproduct of this measurement, we have determined the branching from the isomer to be 2.14(3)%.