Experimental test of the time stability of the half-life of alpha-decay 214Po nuclei

Alexeyev, E. N.; Алексеенко, В. В.; Gavriljuk, Ju. M.; Gangapshev, A. M.; Gezhaev, A. M.; Kazalov, V. V.; Kuzminov, V. V.; Panasenko, S. I.; Ratkevich, S. S.; Yakimenko, S. P.

doi:10.1016/j.astropartphys.2013.04.005

Cited by 21 publications

(14 citation statements)

References 17 publications

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“…Experimental research of the half-life time stabilities of 214 Po (October 2012 -May 2015, TAU-1 and TAU-2 setups) [1,2,3] and 213 Po (Julay 2015 up to now, TAU-3 setup) [4] carry out at the Baksan Neutrino Observatory of the INR RAS. A half-life defines as a result of analysis of the decay curves constructed from a set of life-time values of separate nuclei of the exploring isotope.…”

Section: Introductionmentioning

confidence: 99%

TAU-4 installation intended for long-term monitoring of a half-life value of the $^{212}$Po

Alexeev,

Gavrilyuk,

Gangapshev

et al. 2018

Preprint

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Description of the TAU-4 installation intended for long-term monitoring of the halflife value T 1/2 of the 212 Po is presented. Natural thorium used as a source of the mothers chain. The methods of measurement and data processing are described. The comparative results of short test measurements carried out in the ground (680 h) and underground (564 h) laboratories are given. Averaged value T 1/2 =294.09 ± 0.07 ns of the 212 Po half-life has been found for the ground level data set similar one for the underground data set. The solar-daily variations with amplitudes ASo = (11.7 ± 5.2) × 10 −4 for the ground data and ASo = (7.5 ± 4.1) × 10 −4 for the underground one were found in a series of τ values.

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Section: Introductionmentioning

confidence: 99%

TAU-4 installation intended for long-term monitoring of a half-life value of the $^{212}$Po

Alexeev,

Gavrilyuk,

Gangapshev

et al. 2018

Preprint

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“…The basic framework of quantum mechanics is disturbed without modification to the Schrödinger equation for a position dependenth, or by imposing special conditions of some sort. Inspecting (20) and (22), one might consider special conditions on the forms ofh or ψ so the additional terms are zero, and the operator becomes "effectively Hermitian". It is worth mentioning there is ongoing work on non-Hermitian and complex Hamiltonians being used to describe dissipative and open systems [35,36].…”

Section: Symmetrized Hermitian Frequency Operator F H and Modified Scmentioning

confidence: 99%

“…It should be mentioned that there have been studies in which it was concluded there was no gravitational dependence to the decay rate oscillations [20,21]. There is also dispute in the literature concerning the reality of the decay rate oscillations [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Position Dependent Planck’s Constant in a Frequency-Conserving Schrödinger Equation

Dannenberg

2020

Symmetry

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There is controversial evidence that Planck’s constant shows unexpected variations with altitude above the earth due to Kentosh and Mohageg, and yearly systematic changes with the orbit of the earth about the sun due to Hutchin. Many others have postulated that the fundamental constants of nature are not constant, either in locally flat reference frames, or on larger scales. This work is a mathematical study examining the impact of a position dependent Planck’s constant in the Schrödinger equation. With no modifications to the equation, the Hamiltonian becomes a non-Hermitian radial frequency operator. The frequency operator does not conserve normalization, time evolution is no longer unitary, and frequency eigenvalues can be complex. The wavefunction must continually be normalized at each time in order that operators commuting with the frequency operator produce constants of the motion. To eliminate these problems, the frequency operator is replaced with a symmetrizing anti-commutator so that it is once again Hermitian. It is found that particles statistically avoid regions of higher Planck’s constant in the absence of an external potential. Frequency is conserved, and the total frequency equals “kinetic frequency” plus “potential frequency”. No straightforward connection to classical mechanics is found, that is, the Ehrenfest’s theorems are more complicated, and the usual quantities related by them can be complex or imaginary. Energy is conserved only locally with small gradients in Planck’s constant. Two Lagrangian densities are investigated to determine whether they result in a classical field equation of motion resembling the frequency-conserving Schrödinger equation. The first Largrangian is the “energy squared” form, the second is a “frequency squared” form. Neither reproduces the target equation, and it is concluded that the frequency-conserving Schrödinger equation may defy deduction from field theory.

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“…The construction of the TAU-3 facility with a 229 Th source is similar to TAU-1 and TAU-2 [1]. It comprises a scintillation detector D1, a plastic scintillator (PS), which is made of two disks d = 18 mm and h = 1 mm glued together.…”

Section: The Facility Descriptionmentioning

confidence: 99%

“…Experimental studies of 214 Po half-life time dependence (τ ) [1][2][3] have been carried out at the Baksan Neutrino Observatory of the Institute for Nuclear Research of the Russian Academy of Sciences since 2008. Unlike studies on determining the half-life by the results of analysis of time dependence of the explored isotope activity, decay curves analyzed at the Observatory are plotted based on a set of data on lifetimes of separate nuclei of the 214 Po isotope.…”

Section: Introductionmentioning

confidence: 99%

Search for Variations of 213Ро Half-Life

et al. 2018

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A device with the parent 229 Th source was constructed to search for variations of the daughter 213 Po half-life (T 1/2 = 4.2 µs). A solar-daily variation with amplitude ASo = (5.3 ± 1.1) × 10 −4 , a lunar-daily variation with amplitude AL = (4.8 ± 2.1) × 10 −4 , and a sidereal-daily variation with amplitude AS = (4.2 ± 1.7) × 10 −4 were found upon proceeding the data series over a 622-day interval (from July 2015 to March 2017). The 213 Po half-life mean value is found to be T 1/2 = 3.705 ± 0.001 µs. The obtained half-life is in good agreement with some of the literature values obtained with great accuracy.

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Experimental test of the time stability of the half-life of alpha-decay 214Po nuclei

Cited by 21 publications

References 17 publications

TAU-4 installation intended for long-term monitoring of a half-life value of the $^{212}$Po

TAU-4 installation intended for long-term monitoring of a half-life value of the $^{212}$Po

Position Dependent Planck’s Constant in a Frequency-Conserving Schrödinger Equation

Search for Variations of 213Ро Half-Life

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