New {sup 142,144}Nd ({ital n},{gamma}) Cross Sections and the {ital s}-process Origin of the Nd Anomalies in Presolar Meteoric Silicon Carbide Grains

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.78.2704· OSTI ID:490194

Guber, K; Spencer, R; Koehler, P ^[1]; Winters, R ^[2]

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1. Oak Ridge National Laboratory, Physics Division, MS-6354, Oak Ridge, Tennessee 37831 (United States)
2. Department of Physics and Astronomy, Denison University, Granville, Ohio 43023 (United States)

We have made improved measurements of the {sup 142,144}Nd(n,{gamma}) cross sections and investigated the {ital s}-process nucleosynthesis in the Ce-Nd-Sm region. Recently discovered anomalies of the Nd isotopes in silicon carbide grains from the Murchison meteorite have been interpreted in terms of pure {ital s}-process material from an AGB star. With previous cross section data the {ital s}-process origin could not be confirmed, whereas our new data convincingly support the interpretation that these isotopic anomalies were carried into the early solar system inside carbon dust particles that condensed in outflowing winds of presolar AGB stars. {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: Oak Ridge National Laboratory
• DOE Contract Number: AC05-96OR22464; FG02-87ER40326
• OSTI ID: 490194
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 14 Vol. 78; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CROSS SECTIONS
NEODYMIUM 142
NEODYMIUM 144
NEUTRON REACTIONS
NUCLEOSYNTHESIS
S PROCESS
SILICON CARBIDES
SOLAR SYSTEM