Generalized Lomb–Scargle analysis of $$\mathrm {^{36}Cl}$$ 36Cl decay rate measurements at PTB and BNL

Akanksha Dhaygude (Department of Physics, IIT Hyderabad, Kandi, Telangana, 502285, India) ; Shantanu Desai (Department of Physics, IIT Hyderabad, Kandi, Telangana, 502285, India)

Recently Pomme et al. (Solar Phys 292:162, 2017) did an analysis of $${^{36}\hbox {Cl}} $$ 36Cl radioactive decay data from measurements at the Physikalisch-Technische Bundesanstalt (PTB), in order to verify the claims by Sturrock and collaborators of an influence on beta-decay rates measured at Brookhaven National Lab (BNL) due to the rotation-induced modulation of the solar neutrino flux. Their analysis excluded any sinusoidal modulations in the frequency range from 0.2 to 20/year. We carry out an independent analysis of the same PTB and BNL data, using the generalized Lomb–Scargle periodogram to look for any statistically significant peaks in the range from 0 to 14 per year, and by evaluating the significance of every peak using multiple methods. Our results for the PTB data are in agreement with those by Pomme et al. For BNL data, we do find peaks at some of the same frequencies as Sturrock et al., but the significance is much lower. All our analysis codes and datasets have been made publicly available.

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      "value": "Recently Pomme et al. (Solar Phys 292:162, 2017) did an analysis of $${^{36}\\hbox {Cl}} $$ <math><mrow><msup><mrow></mrow><mn>36</mn></msup><mtext>Cl</mtext></mrow></math>  radioactive decay data from measurements at the Physikalisch-Technische Bundesanstalt (PTB), in order to verify the claims by Sturrock and collaborators of an influence on beta-decay rates measured at Brookhaven National Lab (BNL) due to the rotation-induced modulation of the solar neutrino flux. Their analysis excluded any sinusoidal modulations in the frequency range from 0.2 to 20/year. We carry out an independent analysis of the same PTB and BNL data, using the generalized Lomb\u2013Scargle periodogram to look for any statistically significant peaks in the range from 0 to 14 per year, and by evaluating the significance of every peak using multiple methods. Our results for the PTB data are in agreement with those by Pomme et al. For BNL data, we do find peaks at some of the same frequencies as Sturrock et al., but the significance is much lower. All our analysis codes and datasets have been made publicly available."
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Published on:
24 April 2020
Publisher:
Springer
Published in:
European Physical Journal C , Volume 80 (2020)
Issue 2
Pages 1-6
DOI:
https://doi.org/10.1140/epjc/s10052-020-7683-6
Copyrights:
The Author(s)
Licence:
CC-BY-4.0

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