STRONTIUM ISOTOPIC COMPOSITION IN INDIVIDUAL CIRCUMSTELLAR SILICON-CARBIDE GRAINS - A RECORD OF S-PROCESS NUCLEOSYNTHESIS

Authors
NICOLUSSI GK PELLIN MJ LEWIS RS DAVIS AM CLAYTON RN AMARI S
Citation
Gk. Nicolussi et al., STRONTIUM ISOTOPIC COMPOSITION IN INDIVIDUAL CIRCUMSTELLAR SILICON-CARBIDE GRAINS - A RECORD OF S-PROCESS NUCLEOSYNTHESIS, Physical review letters, 81(17), 1998, pp. 3583-3586
Citations number
21
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
81
Issue
17
Year of publication
1998
Pages
3583 - 3586
Database
ISI
SICI code
0031-9007(1998)81:17<3583:SICIIC>2.0.ZU;2-5
Abstract
Twenty six individual circumstellar SIC grains extracted from the Murc hison meteorite were analyzed for their strontium isotopic composition s by resonant ionization mass spectrometry. Large abundance deficits w ere found for the p-process isotope Sr-84. The measured grains had Sr- 87/Sr-86 ratios indistinguishable from the primordial solar value, but several grains differed in their Sr-88/Sr-86 ratios as a consequence of the branch point at Kr-85. The Sr isotopic data are consistent with s-process nucleosynthesis at moderate neutron densities. [S0031-9007( 98)07435-3].