Precise test of internal-conversion theory: αK measurements for transitions in nine nuclei spanning 45 ≤ Z ≤ 78

J C Hardy; N Nica; V E Iacob; M B Trzhaskovskaya

doi:10.1016/j.apradiso.2017.05.021

Precise test of internal-conversion theory: α_K measurements for transitions in nine nuclei spanning 45 ≤ Z ≤ 78

Appl Radiat Isot. 2018 Apr:134:406-409. doi: 10.1016/j.apradiso.2017.05.021. Epub 2017 May 31.

Authors

J C Hardy¹, N Nica², V E Iacob², M B Trzhaskovskaya³

Affiliations

¹ Cyclotron Institute, Texas A&M University, College Station, TX 77845-3366, USA. Electronic address: [email protected].
² Cyclotron Institute, Texas A&M University, College Station, TX 77845-3366, USA.
³ Petersburg Nuclear Physics Institute, Gatchina 188300, Russia.

PMID: 28599857
DOI: 10.1016/j.apradiso.2017.05.021

Abstract

We have been testing the theory used to calculate internal-conversion coefficients (ICCs) by making a series of measurements of α_K values with precision better than ±2%. So far we have measured E3 transitions in three nuclei, ¹⁰³Rh, ¹¹¹Cd and ¹³⁴Cs; and M4 transitions in six nuclei, ¹¹⁹Sn, ¹²⁵Te, ¹²⁷Te, ¹³⁷Ba, ¹⁹³Ir and ¹⁹⁷Pt. Together, these span a wide range of A and Z values. In all cases, the results strongly favor Dirac-Fock calculations in which the final-state electron wave function has been computed in an atomic field that includes the vacancy created by the internal-conversion process.