Annual variations of the ${}^{214}$Po, ${}^{213}$Po and ${}^{212}$Po half-life values

Abstract

Results of a comparative analysis of the ${}^{214}$Po ($T_{1/2}=163.47\pm 0.03$ $\mu$s), ${}^{213}$Po ($T_{1/2}=3.705\pm 0.001$ $\mu$s) and ${}^{212}$Po ($T_{1/2}=294.09\pm 0.07$ ns) half-life annular variation parameters are presented. It is shown that two independent sequential sets of the ${}^{214}$Po $\tau$-values $(\tau \equiv T_{1/2})$ obtained in the spaced laboratories can be described by sinusoidal functions. The sinusoid curve with amplitude $A=(5.0\pm 1.5)\cdot 10^{-4}$, period $\omega =(365\pm 8)$ days, and phase $\varphi =(170\pm 7)$ days approximates the set of ${}^{214}$Po $\tau$ values obtained at BNO INR RAS during the $\sim$973 days starting on January 4, 2012. The function approximates a set of $\tau$-values with a time duration of $\sim 1460$ days obtained at the KhNU has an amplitude $A=(4.9\pm 1.8)\cdot 10^{-4}$, a period $\omega =(377\pm 13)$ days and a phase $\varphi =(77\pm 10)$ days. The ${}^{213}$Po $\tau$-value set with a time duration of $\sim 1700$ days can be described by a sinusoidal function with an amplitude $A=(3.9\pm 1.2)\cdot 10^{-4}$, a period $\omega =(370\pm 13)$ days and a phase $\varphi =(130\pm 9)$ days. The ${}^{212}$Po $\tau$-value set with a time duration of $\sim 670$ days can be described by a sinusoidal function with an amplitude $A=(7.5\pm 1.6)\cdot 10^{-4}$, a period $\omega =(375\pm 13)$ days and a phase $\varphi =(40\pm 10)$ days.

arXiv comment6 pages, 5 figures, Prepared for the proceedings of The 5th International Conference on Particle Physics and Astrophysics (ICPPA-2020)

References in corpus (5)

• Experimental test of the time stability of the half-life of alpha-decay Po-214 nuclei
• Results of a search for daily and annual variations of the Po-214 half-life at the two year observation period
• Sources of the systematic errors in measurements of Po-214 decay half-life time variations at the Baksan deep underground experiments
• Search for Variations of Po-213 Half-Life
• TAU-4 installation intended for long-term monitoring of a half-life value of the ${}^{212}$Po