Precise measurement of alpha(K) for the M4 transition from Ir-193(m): A test of internal-conversion theory Academic Article uri icon

abstract

  • The 10.5-day isomer in 193Ir decays by a single 80.2-keV M4 transition directly to the ground state of that nucleus. We have measured the total intensity of K x rays relative to 80.2-keV rays for this transition to be 98.7(6). With the K-shell fluorescent yield for iridium taken to be 0.958(4), this result yields K= 103.0(8) for the K-shell internal conversion coefficient (ICC). The calculated K for this transition is particularly sensitive to the treatment of the hole that is created by conversion in the atomic K shell. Recent ICC tables, which ignore the hole, yield K=92.0. We demonstrate that calculations incorporating the hole produce values between 99.6 and 103.3 depending on the approximation used. Our result strongly supports the need to include the hole.

published proceedings

  • PHYSICAL REVIEW C

author list (cited authors)

  • Nica, N., Hardy, J. C., Iacob, V. E., Raman, S., Nestor, C. W., & Trzhaskovskaya, M. B.

citation count

  • 28

complete list of authors

  • Nica, N||Hardy, JC||Iacob, VE||Raman, S||Nestor, CW||Trzhaskovskaya, MB

publication date

  • November 2004