Search for Variations of Po-213 Half-Life

Abstract

A device with the parent ${}^{229}$Th source was constructed to search for variations of the daughter ${}^{213}$Po half-life ($T_{1/2}=4.2$ $\mu$s). A solar-daily variation with amplitude $A_{So}=(5.3\pm 1.1)\times 10^{-4}$, a lunar-daily variation with amplitude $A_L=(4.8\pm 2.1)\times 10^{-4}$, and a sidereal-daily variation with amplitude $A_S=(4.2\pm 1.7)\times 10^{-4}$ 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 $T_{1/2}=3.705\pm 0.001$ $\mu$s. The obtained half-life is in good agreement with some of the literature values obtained with great accuracy.

arXiv comment6 pages, 9 figures; to be published in PEPAN

References in corpus (3)

• Working characteristics of the New Low-Background Laboratory (DULB-4900, Baksan Neutrino Observatory)
• Experimental test of the time stability of the half-life of alpha-decay Po-214 nuclei
• Sources of the systematic errors in measurements of Po-214 decay half-life time variations at the Baksan deep underground experiments

Cited by in corpus (2)

• Annual variations of the ${}^{214}$Po, ${}^{213}$Po and ${}^{212}$Po half-life values
• Quantum Nonlocality -- Possible Cosmophysical Effects