High-resolution conversion electron spectroscopy of the 125I electron-capture decay

TL;DR

This study used high-resolution spectroscopy to analyze conversion electrons from 125I decay, revealing detailed nuclear decay parameters and a higher shake probability than predicted.

Contribution

It provides precise measurements of conversion electron parameters and shake probability, improving understanding of 125I decay mechanisms.

Findings

Penetration parameter lambda = -1.2(6)

Mixing ratio |delta| = 0.015(2)

Shake probability estimated at 0.5

Abstract

The conversion electrons from the decay of the 35.5-keV excited state of 125Te following the electron capture decay of 125I have been investigated at high resolution using an electrostatic spectrometer. The penetration parameter lambda = -1.2(6) and mixing ratio |delta| = 0.015(2) were deduced by fitting to literature values and present data. The shake probability of the conversion electrons is estimated to be 0.5, more than two times larger than the predicted value of 0.2.