International Conference
The multi-messenger astronomy:
gamma-ray bursts, search for electromagnetic counterparts to
neutrino events and gravitational waves

7-14 October 2018

Results of three years search for the 213Po half-life variations E.N.Alexeev, Yu.M.Gavrilyuk, A.M.Gangapshev, A.M.Gezhaev, V.V.Kazalov, V.V.Kuzminov, S.I.Panasenko, S.S.Ratkevich

Abstract

      Description of the TAU-3 installation intended for long-term monitoring of the half-life value (T_½ ) of the ²¹³Ро is presented. Isotope ²²⁹Th is used as a source of the mother's chain. The methods of measurement and processing of collected data are reported. Solar-daily variation with an amplitude A_So = (5.3 ± 1.1) · 10^-4, lunar-daily variation with an amplitude A_L = (4.8 ± 2.1)·10^-4 and sidereal-daily variation with an amplitude A_S = (4.2 ± 1.7) · 10^-4 were found as a results of a processing of the 622 days data series (July 2015 - March 2017). An averaged value of the ²¹³Po nuclei decay half-life was found to be to T_½ = 3.705 ± 0.001 μs. A half-life value data set with the week duration step was constructed for the 1177 days measurement time (July 2015 - September 2018). Features of the half-life time behavior were analyzed. Annular variation with an amplitude A = (3.6 ± 0.6)·10^-4 was found.

Reference:
E.N.Alexeev, Yu.M.Gavrilyuk, A.M.Gangapshev, A.M.Gezhaev, V.V.Kazalov, V.V.Kuzminov, S.I.Panasenko, S.S.Ratkevich, "Results of three years search for the ²¹³Po half-life variations", in Proceedings of the International Conference "The multi-messenger astronomy: gamma-ray bursts, search for electromagnetic counterparts to neutrino events and gravitational waves", Russia, Nizhnij Arkhyz (SAO RAS), Terskol (BNO INR RAS), October, 7 - 14, 2018, Publishing house SNEG, Pyatigorsk, 2019, ISBN 978-5-6041711-1-0, pp. 9-15.
DOI: 10.26119/SAO.2019.1.35433
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