On the interpretation of annual oscillations in 32Si and 36Cl decay rate measurements

Abstract The 32Si decay rate measurement data of Alburger et al. obtained in 1982–1986 at Brookhaven National Laboratory have been presented repeatedly as evidence for solar neutrino-induced beta decay. The count rates show an annual sinusoidal oscillation of about 0.1% amplitude and maximum at Febr...

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Autores principales:	S. Pommé, K. Pelczar, K. Kossert, I. Kajan
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/bd1a5dfeeef7418a9e4990779d936f2c
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spelling	oai:doaj.org-article:bd1a5dfeeef7418a9e4990779d936f2c2021-12-02T14:53:43ZOn the interpretation of annual oscillations in 32Si and 36Cl decay rate measurements10.1038/s41598-021-95600-82045-2322https://doaj.org/article/bd1a5dfeeef7418a9e4990779d936f2c2021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-95600-8https://doaj.org/toc/2045-2322Abstract The 32Si decay rate measurement data of Alburger et al. obtained in 1982–1986 at Brookhaven National Laboratory have been presented repeatedly as evidence for solar neutrino-induced beta decay. The count rates show an annual sinusoidal oscillation of about 0.1% amplitude and maximum at February–March. Several authors have claimed that the annual oscillations could not be explained by environmental influences on the set-up, and they questioned the invariability of the decay constant. They hypothesised a correlation with changes in the solar neutrino flux due to annual variations in the Earth-Sun distance, in spite of an obvious mismatch in amplitude and phase. In this work, environmental conditions at the time of the experiment are presented. The 32Si decay rate measurements appear to be inversely correlated with the dew point in a nearby weather station. Susceptibility of the detection set-up to local temperature and humidity conditions is a likely cause of the observed instabilities in the measured decay rates. Similar conclusions apply to 36Cl decay rates measured at Ohio State University in 2005–2012.S. PomméK. PelczarK. KossertI. KajanNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q S. Pommé K. Pelczar K. Kossert I. Kajan On the interpretation of annual oscillations in 32Si and 36Cl decay rate measurements
description	Abstract The 32Si decay rate measurement data of Alburger et al. obtained in 1982–1986 at Brookhaven National Laboratory have been presented repeatedly as evidence for solar neutrino-induced beta decay. The count rates show an annual sinusoidal oscillation of about 0.1% amplitude and maximum at February–March. Several authors have claimed that the annual oscillations could not be explained by environmental influences on the set-up, and they questioned the invariability of the decay constant. They hypothesised a correlation with changes in the solar neutrino flux due to annual variations in the Earth-Sun distance, in spite of an obvious mismatch in amplitude and phase. In this work, environmental conditions at the time of the experiment are presented. The 32Si decay rate measurements appear to be inversely correlated with the dew point in a nearby weather station. Susceptibility of the detection set-up to local temperature and humidity conditions is a likely cause of the observed instabilities in the measured decay rates. Similar conclusions apply to 36Cl decay rates measured at Ohio State University in 2005–2012.
format	article
author	S. Pommé K. Pelczar K. Kossert I. Kajan
author_facet	S. Pommé K. Pelczar K. Kossert I. Kajan
author_sort	S. Pommé
title	On the interpretation of annual oscillations in 32Si and 36Cl decay rate measurements
title_short	On the interpretation of annual oscillations in 32Si and 36Cl decay rate measurements
title_full	On the interpretation of annual oscillations in 32Si and 36Cl decay rate measurements
title_fullStr	On the interpretation of annual oscillations in 32Si and 36Cl decay rate measurements
title_full_unstemmed	On the interpretation of annual oscillations in 32Si and 36Cl decay rate measurements
title_sort	on the interpretation of annual oscillations in 32si and 36cl decay rate measurements
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/bd1a5dfeeef7418a9e4990779d936f2c
work_keys_str_mv	AT spomme ontheinterpretationofannualoscillationsin32siand36cldecayratemeasurements AT kpelczar ontheinterpretationofannualoscillationsin32siand36cldecayratemeasurements AT kkossert ontheinterpretationofannualoscillationsin32siand36cldecayratemeasurements AT ikajan ontheinterpretationofannualoscillationsin32siand36cldecayratemeasurements
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On the interpretation of annual oscillations in 32Si and 36Cl decay rate measurements

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