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No correlation between Solar flares and the decay rate of several β-decaying isotopes


Angevaare, J R; Baudis, L; Breur, P A; Brown, A; Colijn, A P; Lang, R F; Massafferri, A; Nobelen, J C P Y; Perci, R; Reuter, C; Schumann, M (2018). No correlation between Solar flares and the decay rate of several β-decaying isotopes. Astroparticle Physics, 103:62-66.

Abstract

We report on finding no correlation between the two strongest observed Solar flares in September 2017 and the decay rates of 60 Co, 44 Ti and 137 Cs sources, which are continuously measured by two independent NaI(Tl) detector setups. We test for variations in the number of observed counts with respect to the number of expected counts over multiple periods with timescales varying from 1 to 109 h around the Solar flare. No excess or deficit exceeds the 2 σ global significance. We set a conservative lower limit on the decay rate deviation over an 84 h period around the two correlated Solar flares in September 2017 to 0.062% with 2 σ confidence. A fractional change of ∼0.1% in the decay rate of 54 Mn over a period of 84 h was claimed with 7 σ significance during multiple Solar flares in December 2006. We exclude such an effect at 4.7 σ significance.

Abstract

We report on finding no correlation between the two strongest observed Solar flares in September 2017 and the decay rates of 60 Co, 44 Ti and 137 Cs sources, which are continuously measured by two independent NaI(Tl) detector setups. We test for variations in the number of observed counts with respect to the number of expected counts over multiple periods with timescales varying from 1 to 109 h around the Solar flare. No excess or deficit exceeds the 2 σ global significance. We set a conservative lower limit on the decay rate deviation over an 84 h period around the two correlated Solar flares in September 2017 to 0.062% with 2 σ confidence. A fractional change of ∼0.1% in the decay rate of 54 Mn over a period of 84 h was claimed with 7 σ significance during multiple Solar flares in December 2006. We exclude such an effect at 4.7 σ significance.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Uncontrolled Keywords:Astronomy and Astrophysics
Language:English
Date:1 December 2018
Deposited On:30 Nov 2018 14:41
Last Modified:01 Dec 2018 08:31
Publisher:Elsevier
ISSN:0927-6505
OA Status:Closed
Publisher DOI:https://doi.org/10.1016/j.astropartphys.2018.07.003

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