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

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Standard

γ-ray irradiation in the early Solar System and the conundrum of the 176Lu decay constant. / Albarède, Francis; Scherer, Erik E.; Blichert-Toft, Janne; Rosing, Minik; Simionovici, Alexandre; Bizzarro, Martin.

In: Geochimica et Cosmochimica Acta, Vol. 70, No. 5, 2006, p. 1261-1270.

Research output: Contribution to journal › Journal article › Research › peer-review

Harvard

Albarède, F, Scherer, EE, Blichert-Toft, J, Rosing, M, Simionovici, A & Bizzarro, M 2006, 'γ-ray irradiation in the early Solar System and the conundrum of the 176Lu decay constant', Geochimica et Cosmochimica Acta, vol. 70, no. 5, pp. 1261-1270. https://doi.org/10.1016/j.gca.2005.09.027

APA

Albarède, F., Scherer, E. E., Blichert-Toft, J., Rosing, M., Simionovici, A., & Bizzarro, M. (2006). γ-ray irradiation in the early Solar System and the conundrum of the 176Lu decay constant. Geochimica et Cosmochimica Acta, 70(5), 1261-1270. https://doi.org/10.1016/j.gca.2005.09.027

Vancouver

Albarède F, Scherer EE, Blichert-Toft J, Rosing M, Simionovici A, Bizzarro M. γ-ray irradiation in the early Solar System and the conundrum of the 176Lu decay constant. Geochimica et Cosmochimica Acta. 2006;70(5):1261-1270. https://doi.org/10.1016/j.gca.2005.09.027

Author

Albarède, Francis ; Scherer, Erik E. ; Blichert-Toft, Janne ; Rosing, Minik ; Simionovici, Alexandre ; Bizzarro, Martin. / γ-ray irradiation in the early Solar System and the conundrum of the 176Lu decay constant. In: Geochimica et Cosmochimica Acta. 2006 ; Vol. 70, No. 5. pp. 1261-1270.

Bibtex

@article{ab6b724e54e94648ab82f7f6ee26d344,
title = "γ-ray irradiation in the early Solar System and the conundrum of the 176Lu decay constant",
abstract = "When recent geological calibrations of the 176Lu decay constant are used, the 176Lu-176Hf ages of chondrites are consistently 4% too old (∼4.75 Ga). Here, we suggest that this discrepancy reflects the photoexcitation of the long-lived 176Lu ground state to the short-lived isomeric state (T1/2 = 3.7 h) by γ-rays irradiating early condensates. Irradiation may have been of solar origin and taking place at the inner edge of the nebular disk. Alternatively, the source of γ-rays could have been one or more supernova(e) exploding in the vicinity of the solar nebula. Such photoexcitation has been experimentally observed, but requires γ-ray photons that have energies in excess of 838 keV. At this stage, we cannot assess whether the Hf isotope composition of the Bulk Silicate Earth differs from that of chondrites, eucrites, and the 4.56 Ga old Martian meteorite ALH84001, and therefore, whether the precursor material for these different planetary bodies received comparable fluences of γ-rays.",
author = "Francis Albar{\`e}de and Scherer, {Erik E.} and Janne Blichert-Toft and Minik Rosing and Alexandre Simionovici and Martin Bizzarro",
year = "2006",
doi = "10.1016/j.gca.2005.09.027",
language = "English",
volume = "70",
pages = "1261--1270",
journal = "Geochimica et Cosmochimica Acta. Supplement",
issn = "0046-564X",
publisher = "Pergamon Press",
number = "5",

}

RIS

TY - JOUR

T1 - γ-ray irradiation in the early Solar System and the conundrum of the 176Lu decay constant

AU - Albarède, Francis

AU - Scherer, Erik E.

AU - Blichert-Toft, Janne

AU - Rosing, Minik

AU - Simionovici, Alexandre

AU - Bizzarro, Martin

PY - 2006

Y1 - 2006

N2 - When recent geological calibrations of the 176Lu decay constant are used, the 176Lu-176Hf ages of chondrites are consistently 4% too old (∼4.75 Ga). Here, we suggest that this discrepancy reflects the photoexcitation of the long-lived 176Lu ground state to the short-lived isomeric state (T1/2 = 3.7 h) by γ-rays irradiating early condensates. Irradiation may have been of solar origin and taking place at the inner edge of the nebular disk. Alternatively, the source of γ-rays could have been one or more supernova(e) exploding in the vicinity of the solar nebula. Such photoexcitation has been experimentally observed, but requires γ-ray photons that have energies in excess of 838 keV. At this stage, we cannot assess whether the Hf isotope composition of the Bulk Silicate Earth differs from that of chondrites, eucrites, and the 4.56 Ga old Martian meteorite ALH84001, and therefore, whether the precursor material for these different planetary bodies received comparable fluences of γ-rays.

AB - When recent geological calibrations of the 176Lu decay constant are used, the 176Lu-176Hf ages of chondrites are consistently 4% too old (∼4.75 Ga). Here, we suggest that this discrepancy reflects the photoexcitation of the long-lived 176Lu ground state to the short-lived isomeric state (T1/2 = 3.7 h) by γ-rays irradiating early condensates. Irradiation may have been of solar origin and taking place at the inner edge of the nebular disk. Alternatively, the source of γ-rays could have been one or more supernova(e) exploding in the vicinity of the solar nebula. Such photoexcitation has been experimentally observed, but requires γ-ray photons that have energies in excess of 838 keV. At this stage, we cannot assess whether the Hf isotope composition of the Bulk Silicate Earth differs from that of chondrites, eucrites, and the 4.56 Ga old Martian meteorite ALH84001, and therefore, whether the precursor material for these different planetary bodies received comparable fluences of γ-rays.

U2 - 10.1016/j.gca.2005.09.027

DO - 10.1016/j.gca.2005.09.027

M3 - Journal article

AN - SCOPUS:32944474860

VL - 70

SP - 1261

EP - 1270

JO - Geochimica et Cosmochimica Acta. Supplement

JF - Geochimica et Cosmochimica Acta. Supplement

SN - 0046-564X

IS - 5

ER -

ID: 240786060