Tungsten Nuclear Anomalies in Planetesimal Cores | Zendy

Liping Qin | Zendy; Nicolas Dauphas | Zendy; M. Wadhwa | Zendy; A. Markowski | Zendy; R. Gallino | Zendy; P. E. Janney | Zendy; Claudia Bouman | Zendy

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Tungsten Nuclear Anomalies in Planetesimal Cores

Author(s) -

Liping Qin,

Nicolas Dauphas,

M. Wadhwa,

A. Markowski,

R. Gallino,

P. E. Janney,

Claudia Bouman

Publication year - 2008

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/524882

Subject(s) - planetesimal , physics , formation and evolution of the solar system , meteorite , nucleosynthesis , protoplanet , astrobiology , astrophysics , solar system , nebula , planet , astronomy , silicate , tungsten , protoplanetary nebula , planetary nebula , chondrule , chondrite , protoplanetary disk , stars , chemistry , organic chemistry

Use of the extinct 182 Hf- 182 W chronometer to constrain the timing of planetary accretion and differentiation rests ontheassumptionthatthesolarnebulahadhomogeneoustungstenisotopiccomposition.Here,wereportdeficiencies of 0.1 part in 10,000 in the abundance of 184 Win group IVB iron meteorites relative to the silicate Earth. These are mostlikelyduetoincompletemixingattheplanetesimalscale(2Y4kmradiusbodies)oftheproductsof slow(s-)and rapid (r-) neutron-capture nucleosynthesis in the solar nebula. The correction that must be applied to the 182 Hf- 182 W model age of core formation in IVB irons due to the presence of these nuclear anomalies is 0.5 Myr. Subject headingg minor planets, asteroids — nuclear reactions, nucleosynthesis, abundances — solar system: formation — stars: abundances

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