Evidence of solar influence on the tritium decay rate

Veprev, D.P.; Muromtsev, V.I.

doi:10.1016/j.astropartphys.2012.04.012

Cited by 15 publications

(10 citation statements)

References 19 publications

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“…While it is possible to attribute the annual periods to a ''seasonal'' influence with a clear annual variation, such as temperature, periodicities on the order of six months, one month, or less, are not. Furthermore, as shown in Sturrock et al (2010a,b), Sturrock et al (2011a), Shnoll et al (1998) and Veprev and Muromtsev (2012), the observed decay frequencies align closely with known solar periodicites. This tends to support the original hypotheses of , suggesting that there is a solar influence on radioactive decay rates on Earth.…”

Section: Discussionsupporting

confidence: 59%

Concerning the time dependence of the decay rate of 137Cs

Jenkins

Fischbach

Javorsek

et al. 2013

Applied Radiation and Isotopes

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Section: Discussionsupporting

confidence: 59%

Concerning the time dependence of the decay rate of 137Cs

Jenkins

Fischbach

Javorsek

et al. 2013

Applied Radiation and Isotopes

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“…All experiments are included regardless of reporting observed variation or null observations. The reported decay modes include (1) the negative β-decay with time-dependent variation results (Red Triangles) [1,3,6,16,18,25,[31][32][33], (2)the negative β-decay with "Null" variation results (Red Squares) [8,11,19,[26][27][28]30] (3) the positive β-decay with time-dependent variation results (Or- VII, and VIII. The data includes (1) β − decay with variation results [1,3,6,16,18,25,[31][32][33], (2) β − decay with no effect results [8,11,19,[26][27][28]30], (3) β + decay with variation results [7], (4) β + decay with no effect results [34], (5) Electron Capture decay with variation results [21], (6) Electron Capture decay with no effect results [8,11,19], (7) α decay with with variation results [5], (8)α decay with no effect results [11,30,36], and (9) reactor antinuetrino as a test source with no effect results…”

Section: Mn Results After All Corrections (Roi)mentioning

confidence: 99%

“…al. [25] measured the high-energy region of the tritium beta decay spectrum using a liquid scintillation detector system viewed by three photomultipliers. Veprev reported decay rate parameter oscillations which coincide with the solar neutrino flux variation distance from the Earth to the Sun, as shown in Table III.…”

Section: Sourcementioning

confidence: 99%

Test of Nuclear Decay Rate Variation due to an Antineutrino Flux

Liu,

Koltick,

Wang

et al. 2021

Preprint

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Background: Unexplained variations of the decay rate parameter for weak interaction decays such as β ± -decay, electron capture, as well as strong interaction α-decay have been reported. Because these variations have been presented by a number of groups, at various locations, using various types of detectors, different isotopes, and over extended periods of time, some researchers have interpreted the source of these variations as not from ambient environmental factors such as temperature, pressure, and humidity but via an unexplained fundamental interaction. Purpose: To review the state of decay rate parameter variations experiments and place the reported results into a common comparable context using a temporal cross section. Then to make decay parameter measurements as a function of time at the level of 10 −5 in the presences of an antineutrino flux with an on-off cycle time of ∼30 days. This level of precision requires a detailed understanding of both systematic and statistical errors, otherwise, systematic errors in the measurement may mimic the decay events of fundamental interactions. Two weak interaction decays, one via electron capture and the other via β − decay were selected because the final state and the time reverse state each contain a neutrino and anti-neutrino, covering arguments that the anti-neutrino flux may interact differently or not at all in one of the cases. Methods: The experiment searched for variation of the 54 25 Mn, e − capture decay rate parameter and 137 55 Cs, β − decay rate parameter both to a level of precision of 1 part in ∼ 10 5 by comparing the difference between the decay rate, in the presence of an antineutrino flux ∼ 3 × 10 12 ν cm −2 sec −1 and no flux measurements. The experiment was located 6.5 meters from the reactor core of the High Flux Isotope Reactor(HFIR) in Oak Ridge National Laboratory. Results: The γ spectra from both decays were collected and analyzed independently. The measured variation in the decay rate parameters are found to be δλ/λ = (0.034 ± 1.38) × 10 −5 for 54 25 Mn and δλ/λ = (0.67 ± 1.56) × 10 −5 for 137 55 Cs. These results are consistent with no measurable decay rate parameter variation due to an antineutrino flux, yielding a 68% confidence level upper limit sensitivity for 54 25 Mn δλ/λ ≤ 1.31 × 10 −5 or σ ≤ 1.29 × 10 −25 cm 2 in cross section and for 137 55 Cs δλ/λ ≤ 2.23 × 10 −5 or σ ≤ 5.69 × 10 −27 cm 2 . Conclusions: The cross-section upper limit obtained in these null or no observable effect measurements are ∼ 10 4 times more sensitive than past experiments reporting positive results in 54 Mn and 137 Cs.

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“…Old and recent data have been analyzed, or reanalyzed, to search for periodic and sporadic variations with time. Some of the measurements and analyses confirm the existence of oscillations [7,8,9] whereas others contradict this hypothesis [10,11,12,13,14]. For instance, [7] presents the time dependence of the counting rate for 60 Co, 90 Sr and 90 Y sources, measured with Geiger Müller detectors and for a 239 Pu source, measured with silicon detectors.…”

Section: Introductionmentioning

confidence: 99%

Search for time modulations in the decay rate of 40K and 232Th

Bellotti

Broggini

Carlo

et al. 2015

Astroparticle Physics

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Time modulations at per mil level have been reported to take place in the decay constant of about 15 nuclei with period of one year (most cases) but also of about one month or one day. In this paper we give the results of the activity measurement of a 40 K source and a 232 Th one. The two experiments have been done at the Gran Sasso Laboratory during a period of about 500 days, above ground ( 40 K) and underground ( 232 Th) with a target sensitivity of a few parts over 10 5 . We also give the results of the activity measurement at the time of the X-class solar flares which took place in May 2013. Briefly, our measurements do not show any evidence of unexpected time dependence in the decay rate of 40 K and 232 Th.

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Evidence of solar influence on the tritium decay rate

Cited by 15 publications

References 19 publications

Concerning the time dependence of the decay rate of 137Cs

Concerning the time dependence of the decay rate of 137Cs

Test of Nuclear Decay Rate Variation due to an Antineutrino Flux

Search for time modulations in the decay rate of 40K and 232Th

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