Search for Variations of 213Ро Half-Life

Abstract

A device with the parent 229 Th source was constructed to search for variations of the daughter 213 Po half-life (T 1/2 = 4.2 µs). A solar-daily variation with amplitude ASo = (5.3 ± 1.1) × 10 −4 , a lunar-daily variation with amplitude AL = (4.8 ± 2.1) × 10 −4 , and a sidereal-daily variation with amplitude AS = (4.2 ± 1.7) × 10 −4 were found upon proceeding the data series over a 622-day interval (from July 2015 to March 2017). The 213 Po half-life mean value is found to be T 1/2 = 3.705 ± 0.001 µs. The obtained half-life is in good agreement with some of the literature values obtained with great accuracy.

TAU-4 installation intended for long-term monitoring of a half-life value of the $^{212}$Po

“…Experimental research of the half-life time stabilities of 214 Po (October 2012 -May 2015, TAU-1 and TAU-2 setups) [1,2,3] and 213 Po (Julay 2015 up to now, TAU-3 setup) [4] carry out at the Baksan Neutrino Observatory of the INR RAS. A half-life defines as a result of analysis of the decay curves constructed from a set of life-time values of separate nuclei of the exploring isotope.…”