A new precision measurement of the α -decay half-life of 190 Pt

Braun, Mihály; Georgiev, Yordan M.; Schönherr, Tommy; Wilsenach, H.; Zuber, Κ.

doi:10.1016/j.physletb.2017.02.052

Cited by 16 publications

(11 citation statements)

References 14 publications

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“…An updated physics number for the half‐life of 190 Pt reported in Braun et al. (2017) agrees with the numbers obtained by Cook et al. (2004), who presented a detailed study of a suite of well‐behaved (closed system evolution), 4.5 billion year old, iron meteorites (i.e., Groups IIAB and IIIAB).…”

Section: Contrasting Methodologiessupporting

confidence: 84%

“…The rightmost column reports the relative difference, in percent, between the decay constants from these communities and for some, the difference can be considerable (more than 30%). An updated physics number for the half-life of 190 Pt reported in Braun et al (2017) agrees with the numbers obtained by Cook et al (2004), who presented a detailed study of a suite of well-behaved (closed system evolution), 4.5 billion year old, iron meteorites (i.e., Groups IIAB and IIIAB).…”

Section: Contrasting Methodologiessupporting

confidence: 82%

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Radiogenic Power and Geoneutrino Luminosity of the Earth and Other Terrestrial Bodies Through Time

McDonough

Šrámek

Wipperfurth

2020

Geochem Geophys Geosyst

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We report the Earth's rate of radiogenic heat production and (anti)neutrino luminosity from geologically relevant short‐lived radionuclides (SLR) and long‐lived radionuclides (LLR) using decay constants from the geological community, updated nuclear physics parameters, and calculations of the β spectra. We track the time evolution of the radiogenic power and luminosity of the Earth over the last 4.57 billion years, assuming an absolute abundance for the refractory elements in the silicate Earth and key volatile/refractory element ratios (e.g., Fe/Al, K/U, and Rb/Sr) to set the abundance levels for the moderately volatile elements. The relevant decays for the present‐day heat production in the Earth (19.9 ± 3.0 TW) are from 40K, 87Rb, 147Sm, 232Th, 235U, and 238U. Given element concentrations in kg‐element/kg‐rock and density ρ in kg/m3, a simplified equation to calculate the present‐day heat production in a rock is h[μW m−3]=ρ3.387×10−3K+0.01139Rb+0.04595Sm+26.18Th+98.29U The radiogenic heating rate of Earth‐like material at solar system formation was some 103 to 104 times greater than present‐day values, largely due to decay of 26Al in the silicate fraction, which was the dominant radiogenic heat source for the first ∼10 Ma. Assuming instantaneous Earth formation, the upper bound on radiogenic energy supplied by the most powerful short‐lived radionuclide 26Al (t1/2 = 0.7 Ma) is 5.5×1031 J, which is comparable (within a factor of a few) to the planet's gravitational binding energy.

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Section: Contrasting Methodologiessupporting

confidence: 84%

Section: Contrasting Methodologiessupporting

confidence: 82%

Radiogenic Power and Geoneutrino Luminosity of the Earth and Other Terrestrial Bodies Through Time

McDonough

Šrámek

Wipperfurth

2020

Geochem Geophys Geosyst

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“…therein); the recommended half-life value for this transition was: T α 1/2 = (6.5 ± 0.3) × 10 11 yr [94], but recently a laboratory measurement of the α decay half-life of 190 Pt has been performed using a low background Frisch grid ionization chamber. The resulting half-life is (4.97 ± 0.16) ×10 11 yr, with a total uncertainty of 3.2% [80]. This result is in good agreement with the half-life obtained using the geological comparison method of (4.78 ± 0.05) ×10 11 yr.…”

Section: Pt α Decaysupporting

confidence: 85%

“…(Color online)190 Pt half-life measurements as a function of time. For the interpretation of the references to colour in this figure legend see Ref [80]…”

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confidence: 99%

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Experimental searches for rare alpha and beta decays

et al. 2019

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The current status of the experimental searches for rare alpha and beta decays is reviewed. Several interesting observations of alpha and beta decays, previously unseen due to their large half-lives (10 15 − 10 20 yr), have been achieved during the last years thanks to the improvements in the experimental techniques and to the underground locations of experiments that allows to suppress backgrounds. In particular, the list includes first observations of alpha decays of 151 Eu, 180 W (both to the ground state of the daughter nuclei), 190 Pt (to excited state of the daughter nucleus), 209 Bi (to the ground and excited states of the daughter nucleus). The isotope 209 Bi has the longest known half-life of T 1/2 ≈ 10 19 yr relatively to alpha decay. The beta decay of 115 In to the first excited state of 115 Sn (Eexc = 497.334 keV), recently observed for the first time, has the Q β value of only (147 ± 10) eV, which is the lowest Q β value known to-date. Searches and investigations of other rare alpha and beta decays ( 48 Ca, 50 V, 96 Zr, 113 Cd, 123 Te, 178m2 Hf, 180m Ta and others) are also discussed.

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Radiogenic power and geoneutrino luminosity of the Earth and other terrestrial bodies through time

McDonough

Šrámek

Wipperfurth

2019

Preprint

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Key Points:• Radiogenic heat production and geoneutrino luminosity calculated over the age of the Earth • Simple formulae proposed for evaluation at arbitrary planetary composition • Differences in radioactive decay parameters highlighted between nuclear physics and geological communities AbstractWe report the Earth's rate of radiogenic heat production and (anti)neutrino luminosity from geologically relevant short-lived radionuclides (SLR) and long-lived radionuclides (LLR) using decay constants from the geological community, updated nuclear physics parameters, and calculations of the β spectra. We carefully account for all branches in 40 K decay using the updated β − energy spectrum from physics and an updated branching ratio from geological studies. We track the time evolution of the radiogenic power and luminosity of the Earth over the last 4.57 billion years, assuming an absolute abundance for the refractory elements in the silicate Earth and key volatile/refractory element ratios (e.g., Fe/Al, K/U, and Rb/Sr) to set the abundance levels for the moderately volatile elements. The relevant decays for the present-day heat production in the Earth (19.9 ± 3.0 TW) are from 40 K, 87 Rb, 147 Sm, 232 Th, 235 U, and 238 U. Given element concentrations in kg-element/kg-rock and density ρ in kg/m 3 , a simplified equation to calculate the heat production in a rock is:3.387 × 10 −3 [K] + 0.01139 [Rb] + 0.04607 [Sm] + 26.18 [Th] + 98.29 [U]The radiogenic heating rate of earth-like material at Solar System formation was some 10 3 to 10 4 times greater than present-day values, largely due to decay of 26 Al in the silicate fraction, which was the dominant radiogenic heat source for the first ∼ 10 My. Decay of 60 Fe contributed a non-negligible amount of heating during the first ∼ 15 My after CAI (Calcium Aluminum Inclusion) formation, interestingly within the time frame of core-mantle segregation. Using factors and equations presented here, one can calculate the first-order thermal and (anti)neutrino luminosity history of various size bodies in the solar system and exoplanets. Plain Language SummaryThe decay of radioactive elements in planetary interior's produces heat that drives the dynamic processes of convection (core and mantle), melting and volcanism in rocky bodies in the solar system and beyond. For elements with half-lives of 100,000 to 100 billion years, uncertainties in their decay constants range from 0.2% to ∼ 4% absolute and about 1% to 4% relative when comparing data sources in physics and geology. These differences, combined with uncertainties in Q (heat of reaction) values, lead to diverging results for heat production and for predictions of the amount of energy removed from the rocky body by emitted (anti)neutrinos.

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A new precision measurement of the α -decay half-life of 190 Pt

Cited by 16 publications

References 14 publications

Radiogenic Power and Geoneutrino Luminosity of the Earth and Other Terrestrial Bodies Through Time

Radiogenic Power and Geoneutrino Luminosity of the Earth and Other Terrestrial Bodies Through Time

Experimental searches for rare alpha and beta decays

Radiogenic power and geoneutrino luminosity of the Earth and other terrestrial bodies through time

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