Geochemical test for branching decay of 176Lu

Amelin, Yuri; Davis, W J

doi:10.1016/j.gca.2004.04.028

Cited by 99 publications

(52 citation statements)

References 64 publications

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“…This topic has been recently reviewed in detail by Soderlund et al (2004) and Amelin and Davis (2005). Only a brief summary is needed here where we will consider the potential explanations provided so far for the k176 Lu conundrum:…”

Section: Previous Attempts To Explain the 176 Lu Decay Constant Conunmentioning

confidence: 95%

“…Amelin and Davis (2005) investigated the isotope composition of Yb in old terrestrial zircons. Even in relatively high-Lu/Yb samples, no 176 Yb excess could be detected and these authors concluded that 'branching decay can therefore be eliminated as the cause of the discrepancy in 176 Lu decay constant estimates.…”

Section: Previous Attempts To Explain the 176 Lu Decay Constant Conunmentioning

confidence: 99%

See 1 more Smart Citation

γ-ray irradiation in the early Solar System and the conundrum of the 176Lu decay constant

Albarède

Scherer²,

Blichert‐Toft

et al. 2006

Geochimica et Cosmochimica Acta

120

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Section: Previous Attempts To Explain the 176 Lu Decay Constant Conunmentioning

confidence: 95%

Section: Previous Attempts To Explain the 176 Lu Decay Constant Conunmentioning

confidence: 99%

γ-ray irradiation in the early Solar System and the conundrum of the 176Lu decay constant

Albarède

Scherer²,

Blichert‐Toft

et al. 2006

Geochimica et Cosmochimica Acta

120

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“…The precision and accuracy of the analyses are described in detail by Griffin et al (2002Griffin et al ( , 2000. The calculation of initial Hf-isotope values used the 176 Lu decay constant of 1.865×10 -11 (Amelin and Davis, 2005). Calculated model ages (T DM ) are based on the depleted mantle model described by Griffin et al (2000).…”

Section: In Situ Hf-isotope Analysis Of Zirconmentioning

confidence: 99%

Age, trace elements and Hf-isotope composition of zircon in eclogites from the sulu UHP belt, East-Central China: Neoproterozoic intrusion and subsequent Paleozoic and Early Mesozoic metamorphism

et al. 2010

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The Sulu (苏鲁)-Dabie (大别) orogen in East-Central China formed during the subduction and collision of the Yangtze block with the North China block in Early Mesozoic (240-225 Ma). Constraints on the nature and derivation of eclogites, which are a significant component of the orogen, can provide useful information about subduction-zone metamorphism and crust-mantle interaction. The U-Pb ages, Hf-isotope ratios and trace-element compositions of zircons in eclogites from the Jiangzhuang (蒋庄) (Jiangsu (江苏) Province) and Rongcheng (荣成) (Shandong (山东) Province) areas indicate that the protoliths of the eclogites derived from ultramafic-mafic complexes or mafic intrusion in the subducted continental lithosphere. The upper intercept age of 852±10 Ma and high ε Hf (up to 14.7) of the Neoproterozoic zircons in a Jiangzhuang sample indicate that the protoliths represent products of the Neoproterozoic addition of juvenile materials to the older (i.e., Paleo-Mesoproterozoic) continental crust. The zircon ages of eclogites from both localities mainly record the Triassic (230-220 Ma) metamorphism, consistent with the formation of the Sulu orogen in Early Mesozoic. The lower intercept age of 316±4 Ma in a Jiangzhuang sample suggests that thermal activity relating to the paleoTethyan in Late Carboniferous also affected the eclogitic protolith. INTRODUCTIONThe Sulu-Dabie orogenic belt is one of the largest ultrahigh-pressure (UHP) metamorphic belts in the world. Sm-Nd geochronology of silicate minerals and zircon U-Pb dating have been widely used to reveal the metamorphic history of the collisional belt (Tang et al.

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“…The measurements and data analysis motivated by this request are described in xx 2 and 3. In x 4 the present results are combined with an updated set of all relevant nuclear physics quantities as well as with the most recent information on the half-life (Amelin 2005;Amelin & Davis 2005) and solar system abundance (de Laeter & Bukilic 2006) of 176 Lu, for a comprehensive analysis of the s-process branching at A ¼ 176.…”

Section: Introductionmentioning

confidence: 99%

¹⁷⁶Lu/¹⁷⁶Hf: A Sensitive Test ofs‐Process Temperature and Neutron Density in AGB Stars

Heil

Winckler

Dababneh

et al. 2008

ApJ

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The s-process branching at A ¼ 176 has been analyzed on the basis of significantly improved experimental cross sections. This work reports on activation measurements of the partial (n; ) cross section of 176 Lu feeding the isomeric state in 176 Lu. In total, six irradiations were performed at the Karlsruhe 3.7 MV pulsed Van de Graaff accelerator, and the induced activities were measured with HPGe clover detectors. In combination with previous data, partial cross sections of 3185 AE 156 and 1153 AE 30 mbarn were deduced at kT ¼ 5:1 and 25 keV, respectively. With these results and a recent time-of-flight measurement of the total stellar (n; ) cross section, the isomeric ratio was found to be constant in the relevant thermal energy range of the main s-process component. Based on these new data, a comprehensive analysis of the branching at 176 Lu was carried out for testing the temperature and neutron density conditions during He shell flashes in thermally pulsing low-mass asymptotic giant branch stars. It was found that the long-standing problem of the mother/daughter ratio of the two s-only isotopes 176 Lu and 176 Hf could be solved, if the temperaturedependent -decay half-life of 176 Lu was considered with sufficient resolution over the temperature profile of the convective He shell flashes.

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Geochemical test for branching decay of 176Lu

Cited by 99 publications

References 64 publications

γ-ray irradiation in the early Solar System and the conundrum of the 176Lu decay constant

γ-ray irradiation in the early Solar System and the conundrum of the 176Lu decay constant

Age, trace elements and Hf-isotope composition of zircon in eclogites from the sulu UHP belt, East-Central China: Neoproterozoic intrusion and subsequent Paleozoic and Early Mesozoic metamorphism

¹⁷⁶Lu/¹⁷⁶Hf: A Sensitive Test ofs‐Process Temperature and Neutron Density in AGB Stars

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Geochemical test for branching decay of 176Lu

Cited by 99 publications

References 64 publications

γ-ray irradiation in the early Solar System and the conundrum of the 176Lu decay constant

γ-ray irradiation in the early Solar System and the conundrum of the 176Lu decay constant

Age, trace elements and Hf-isotope composition of zircon in eclogites from the sulu UHP belt, East-Central China: Neoproterozoic intrusion and subsequent Paleozoic and Early Mesozoic metamorphism

176Lu/176Hf: A Sensitive Test ofs‐Process Temperature and Neutron Density in AGB Stars

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¹⁷⁶Lu/¹⁷⁶Hf: A Sensitive Test ofs‐Process Temperature and Neutron Density in AGB Stars