Half-life of32Si

Alburger, D.E.; Harbottle, G.; Norton, Elinor

doi:10.1016/0012-821x(86)90058-0

Cited by 129 publications

(163 citation statements)

References 14 publications

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“…Liquid scintillation vials with 36 Cl in solution were prepared in December 2009 using 15 mL Ultima Figure 1 Relative difference from the mean value of measured 36 Cl decay rates by Alburger, Harbottle, and Norton (1986) at the BNL (applying 0.1% uncertainty on individual data) (top) and by Kossert and Nähle (2014) at the PTB (source #3 by TDCR) (bottom). The PTB values are an order of magnitude more precise.…”

Section: Measurementsmentioning

confidence: 99%

“…In particular, they observed a prominent 'transient cycle' of 12.7 a −1 (28.76 days period, 0.07% amplitude) in spectrograms formed from countings of 36 Cl and 32 Si decays in a gasflow proportional counter at BNL (Alburger, Harbottle, and Norton, 1986) and found them indicative of the synodic rotation rate of the radiative zone of the Sun, since it matches its helioseismologically determined period of 28.7 days (Schou et al, 1998;Komm et al, 2003). However, it is questionable whether all experimental uncertainties were under control in the aforementioned 36 Cl and 32 Si decay measurements (Pommé, 2015(Pommé, , 2016.…”

Section: Introductionmentioning

confidence: 99%

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On the Claim of Modulations in 36Cl Beta Decay and Their Association with Solar Rotation

2017

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Recently, claims were made by Sturrock et al. (Astropart. Phys. 42, 62, 2013), Sturrock, Fischbach, and Scargle (Solar Phys. 291, 3467, 2016; arXiv, 2017) that beta decay can be induced by interaction of the nucleus with solar neutrinos and that cyclic modulations in decay rates are indicative of the dynamics of the solar interior. Transient modulations in residuals from a purely exponential decay curve were observed at frequencies near 11 a −1 and 12.7 a −1 in repeated activity measurements of a 36 Cl source by Alburger, Harbottle, and Norton (Earth Planet Sci. Lett. 78, 168, 1986) at Brookhaven National Laboratory in a period from 1984 to 1985. Sturrock et al. have speculatively associated them with rotational influence on the solar neutrino flux. In this work, more accurate 36 Cl decay-rate measurements -performed at the Physikalisch-Technische Bundesanstalt Braunschweig in the period 2010 -2013 by means of the triple-to-double coincidence ratio measurement technique -are scrutinised. The residuals from an exponential decay curve were analysed by a weighted Lomb-Scargle periodogram. The existence of modulations in the frequency range between 0.2 a −1 and 20 a −1 could be excluded down to an amplitude of about 0.0016%. The invariability of the 36 Cl decay constant contradicts the speculations made about the deep solar interior on the basis of instabilities in former activity measurements.

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Section: Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Claim of Modulations in 36Cl Beta Decay and Their Association with Solar Rotation

2017

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“…However, recent work has uncovered evidence of an unexpected periodicity in several nuclear decays [2,3,4,5,6]. An examination of the periodic behavior exhibited by the data indicated that the primary frequency observed in each data set corresponded to a period of close to one year [7,8].…”

Section: Introductionmentioning

confidence: 97%

“…More recently a detailed analysis of the response of the detector systems employed in Refs. [2] and [4] concludes that the annual fluctuations in decay rates reported in these references are not likely attributable to environmental influences, such as seasonal temperature and pressure variations thereby suggesting the possibility the decays, and not the detectors, are affected by an external influence [12].…”

Section: Introductionmentioning

confidence: 99%

“…The first experiment analyzed was the determination of the half-life of 32 Si, a β − -decay, performed at Brookhaven National Laboratory (BNL) in Upton, New York, between 1982 and 1986 [2]. In the BNL experiment, it was necessary for the counting rate to be directly measured over several years due to the long half-life of 32 Si, which was determined by the BNL group to be T 1/2 = 172 ± 4 years.…”

Section: Introductionmentioning

confidence: 99%

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Power spectrum analyses of nuclear decay rates

Javorsek

Sturrock

Lasenby³

et al. 2010

Astroparticle Physics

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We provide the results from a spectral analysis of nuclear decay data displaying annually varying periodic fluctuations. The analyzed data were obtained from three distinct data sets: 32 Si and 36 Cl decays reported by an experiment performed at the Brookhaven National Laboratory (BNL), 56 Mn decay reported by the Children's Nutrition Research Center (CNRC), but also performed at BNL, and 226 Ra decay reported by an experiment performed at the Physikalisch-Technische-Bundesanstalt (PTB) in Germany. All three data sets exhibit the same primary frequency mode consisting of an annual period. Additional spectral comparisons of the data to local ambient temperature, atmospheric pressure, relative humidity, Earth-Sun distance, and their reciprocals were performed. No common phases were found between the factors investigated and those exhibited by the nuclear decay data. This suggests that either a combination of factors was responsible, or that, if it was a single factor, its effects on the decay rate experiments are not a direct synchronous modulation. We conclude that the annual periodicity in these data sets is a real effect, but that further study involving additional carefully controlled experiments will be needed to establish its origin.

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