Positron– K -Electron Annihilation in  180 m  Ta Atoms

S. M. Varzar; M. V. Zheltonozhskaya; V. A. Zheltonozhsky; E. N. Lykova; L. V. Sadovnikov; A. P. Chernyaev

doi:10.3103/S1062873818060333

Positron–K-Electron Annihilation in ^180mTa Atoms

Authors: Varzar S.M.¹, Zheltonozhskaya M.V.¹, Zheltonozhsky V.A.², Lykova E.N.¹, Sadovnikov L.V.², Chernyaev A.P.¹
Affiliations:
1. Moscow State University
2. Kyiv Institute for Nuclear Research
Issue: Vol 82, No 6 (2018)
Pages: 712-715
Section: Article
URL: https://journals.rcsi.science/1062-8738/article/view/185418
DOI: https://doi.org/10.3103/S1062873818060333
ID: 185418

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Abstract

The excitation cross sections of ^180mTa are measured for the first time via positron–K-electron annihilation with a limit energy of 0.653 MeV. Effective cross sections σ^eff (^180gTa) are found to be (3.9 ± 0.8) × 10⁻²⁹ cm². The differential cross section is estimated from the effective cross section and agrees qualitatively with theoretical calculations for E1 transitions.