Rates of K-shell Electron Capture Decays of 180Re and 142Pm Atoms

TL;DR

This paper provides a theoretical analysis of experimental data on K-shell electron capture decays of 180Re and 142Pm, concluding that observed data do not support the hypothesis of two closely spaced ground mass-eigenstates causing GSI Oscillations.

Contribution

It offers a theoretical perspective that challenges the explanation of GSI Oscillations via two closely spaced ground mass-eigenstates based on recent decay data.

Findings

No time modulation observed in decay data.

Rules out the two-state explanation for GSI Oscillations.

Supports alternative explanations for the GSI Oscillations.

Abstract

We propose a theoretical analysis of the experimental data on the time behaviour K-shell electron capture (EC) decays of atoms 180Re and 142Pm in solid targets, obtained recently by Faestermann et al. Phys. Lett. B 672, 227 (2009) and Vetter et al., Phys. Lett. B 670, 149 (2008). We show that the absence of the time modulation in these data rules out the explanation of the "GSI Oscillations" (Yu. A. Litvinov et al., Phys. Lett. B 664, 162 (2008)) by means of two closely spaced ground mass-eigenstates of mother nuclei.