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The presence of ^(146)Sm in the early solar system and implications for its nucleosynthesis

Prinzhofer, A. and Papanastassiou, D. A. and Wasserburg, G. J. (1989) The presence of ^(146)Sm in the early solar system and implications for its nucleosynthesis. Astrophysical Journal Letters, 344 (2). L81-L84. ISSN 2041-8205. https://resolver.caltech.edu/CaltechAUTHORS:20131107-102453585

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Abstract

The presence of the p-process nucleus ^(146)Sm (mean life, r = 149 x 10^6 yr) in the early solar system and its in situ ɑ-decay into ^(142)Nd is demonstrated by the correlation of ^(142)Nd/^(144)Nd with ^(144)Sm/^(144)Nd in two meteorites which have a large range in ^(144)Sm/^(144)Nd in their constituent mineral phases. Clear excesses of ^(142)Nd/^(144)Nd, relative to the solar system value, are present in high Sm/Nd phases and a clear deficit of ^(142)Nd/^(144)Nd is observed in one sample with low Sm/Nd. The inferred abundance of ^(146)Sm/^(144)Sm is 0.008 at the time of the last equilibration of each meteorite at 4.47 AE ago, which yields ^(146)Sm/^(144)Sm ~0.015 at the time of formation of the solar system, 4.56 AE ago. These results confirm the presence of ^(146)Sm and provide a well defined initial abundance for ^(146)Sm. The abundance of ^(146)Sm is compatible with the p-process production rate estimates but not with the production rate for ^(146)Sm based on a photodisintegration model for the production of p-process nuclides.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1086/185536DOIArticle
http://adsabs.harvard.edu/doi/10.1086/185536ADSArticle
ORCID:
AuthorORCID
Wasserburg, G. J.0000-0002-7957-8029
Additional Information:© 1989 American Astronomical Society. Received 1989 June 2; accepted 1989 July 10. We benefited from discussions with W. A. Fowler and S. E. Woosley and comments on the Letter by D. D. Clayton. We acknowledge the contributions of N. Z. Boctor for the petrographic study of Ibitira. We are indebted to I. D. Hutcheon for his interest and support of this work. Mineral separations have benefited from the experience of L. M. Hedges. A piece of Morristown was generously provided by E. J. Olsen. This work was supported by NASA (NAG 9-43) and by a Texaco Postdoctoral Fellowship awarded to the senior author. This is Division Contribution 4766 (670).
Funders:
Funding AgencyGrant Number
NASANAG 9-43
Texaco Postdoctoral FellowshipUNSPECIFIED
Subject Keywords:COSMOCHEMISTRY, NUCLEAR ASTROPHYSICS, NUCLEAR FUSION, SAMARIUM ISOTOPES, SOLAR SYSTEM, ABUNDANCE, MASS SPECTROSCOPY, METEORITIC COMPOSITION, NEODYMIUM ISOTOPES, RADIOACTIVE DECAY, SOLAR SYSTEM, SAMARIUM 146, DECAY, METEORITES, ISOTOPIC RATIOS, ABUNDANCE, NUCLEOSYNTHESIS, NEODYMIUM 144, PRODUCTION RATE, SAMPLES, METEORITE, LABORATORY STUDIES, IBITIRA, MORRISTOWN, ISOTOPES, PROCEDURE
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences 4766
Lunatic Asylum Lab670
Issue or Number:2
Record Number:CaltechAUTHORS:20131107-102453585
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20131107-102453585
Official Citation:The presence of Sm-146 in the early solar system and implications for its nucleosynthesis Prinzhofer, A.; Papanastassiou, D. A.; Wasserburg, G. J. Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 344, Sept. 15, 1989, p. L81-L84. Publication Date: 09/1989
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42302
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:08 Nov 2013 00:11
Last Modified:09 Mar 2020 13:19

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