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 ± 0.03 µs), 213 Po (T 1/2 = 3.705 ± 0.001 µs) and 212 Po (T 1/2 = 294.09 ± 0.07 ns) half-life annular variation parameters are presented. It is shown that two independent sequential sets of the 214 Po τvalues (τ ≡ T 1/2 ) obtained in the spaced laboratories can be described by sinusoidal functions. The sinusoid curve with amplitude A = (5.0 ± 1.5) • 10 −4 , period ω = (365 ± 8) days, and phase φ = (170 ± 7) days approximates the set of 214 Po τ values obtained at BNO INR RAS during the ∼973 days starting on January 4, 2012. The function approximates a set of τ -values with a time duration of ∼ 1460 days obtained at the KhNU has an amplitude A = (4.9 ± 1.8) • 10 −4 , a period ω = (377 ± 13) days and a phase φ = (77 ± 10) days. The 213 Po τ -value set with a time duration of ∼ 1700 days can be described by a sinusoidal function with an amplitude A = (3.9 ± 1.2) • 10 −4 , a period ω = (370 ± 13) days and a phase φ = (130 ± 9) days. The 212 Po τ -value set with a time duration of ∼ 670 days can be described by a sinusoidal function with an amplitude A = (7.5 ± 1.6) • 10 −4 , a period ω = (375 ± 13) days and a phase φ = (40 ± 10) days.