Barium isotopes in individual presolar silicon carbide grains from the Murchison meteorite
Barium isotopic compositions of single 2.3–5.3 μm presolar SiC grains from the Murchison meteorite were measured by resonant ionization mass spectrometry. Mainstream SiC grains are enriched in s-process barium and show a spread in isotopic composition from solar to dominantly s-process. In the relat...
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| Veröffentlicht in: | Geochimica et cosmochimica acta 2003-09, Vol.67 (17), p.3201-3214 |
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| container_title | Geochimica et cosmochimica acta |
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| creator | Savina, Michael R. Davis, Andrew M. Tripa, C.Emil Pellin, Michael J. Clayton, Robert N. Lewis, Roy S. Amari, Sachiko Gallino, Roberto Lugaro, Maria |
| description | Barium isotopic compositions of single 2.3–5.3 μm presolar SiC grains from the Murchison meteorite were measured by resonant ionization mass spectrometry. Mainstream SiC grains are enriched in
s-process barium and show a spread in isotopic composition from solar to dominantly
s-process. In the relatively coarse grain size fraction analyzed, there are large grain-to-grain variations of barium isotopic composition. Comparison of single grain data with models of nucleosynthesis in asymptotic giant branch (AGB) stars indicates that the grains most likely come from low mass carbon-rich AGB stars (1.5 to 3 solar masses) of about solar metallicity and with approximately solar initial proportions of
r- and
s-process isotopes. Measurements of single grains imply a wide variety of neutron-to-seed ratios, in agreement with previous measurements of strontium, zirconium and molybdenum isotopic compositions of single presolar SiC grains. |
| doi_str_mv | 10.1016/S0016-7037(03)00083-8 |
| format | Article |
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s-process barium and show a spread in isotopic composition from solar to dominantly
s-process. In the relatively coarse grain size fraction analyzed, there are large grain-to-grain variations of barium isotopic composition. Comparison of single grain data with models of nucleosynthesis in asymptotic giant branch (AGB) stars indicates that the grains most likely come from low mass carbon-rich AGB stars (1.5 to 3 solar masses) of about solar metallicity and with approximately solar initial proportions of
r- and
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s-process barium and show a spread in isotopic composition from solar to dominantly
s-process. In the relatively coarse grain size fraction analyzed, there are large grain-to-grain variations of barium isotopic composition. Comparison of single grain data with models of nucleosynthesis in asymptotic giant branch (AGB) stars indicates that the grains most likely come from low mass carbon-rich AGB stars (1.5 to 3 solar masses) of about solar metallicity and with approximately solar initial proportions of
r- and
s-process isotopes. Measurements of single grains imply a wide variety of neutron-to-seed ratios, in agreement with previous measurements of strontium, zirconium and molybdenum isotopic compositions of single presolar SiC grains.</description><subject>BARIUM</subject><subject>BARIUM ISOTOPES</subject><subject>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</subject><subject>GRAIN SIZE</subject><subject>IONIZATION</subject><subject>MASS SPECTROSCOPY</subject><subject>METEORITES</subject><subject>MOLYBDENUM</subject><subject>NUCLEOSYNTHESIS</subject><subject>S PROCESS</subject><subject>SILICON CARBIDES</subject><subject>STARS</subject><subject>STRONTIUM</subject><subject>ZIRCONIUM</subject><issn>0016-7037</issn><issn>1872-9533</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2003</creationdate><recordtype>article</recordtype><recordid>eNqFkE1LAzEQhoMoWKs_QYg3Pawmm91NchItfkHFg3rxEvIxayPbTUm2Bf-92Va8CsPM5X2fmXkROqXkkhLaXL2S3AtOGD8n7IIQIlgh9tCECl4WsmZsH03-JIfoKKWvLOJ1TSbo41ZHv15in8IQVpCw73M5v_FurTu8ipBCpyNOvvM29NjqaLwD_Bm17xNuY1jiYQH4eR3tIkN6vIQBQvQDHKODVncJTn7nFL3f373NHov5y8PT7GZe6KqRQ1Eax0tTOWaY0dyymjZV67i0jkkpWcm4EZRzQa3TpCoFCDBUQwumtFBbw6bobMcNafAq2bzaLvKtPdhByUo2VZk19U5jY0gpQqtW0S91_FaUqDFEtQ1RjQkpwtQ2RCWy73rng_zAxkMc-dBbcD6OeBf8P4Qfry97EQ</recordid><startdate>20030901</startdate><enddate>20030901</enddate><creator>Savina, Michael R.</creator><creator>Davis, Andrew M.</creator><creator>Tripa, C.Emil</creator><creator>Pellin, Michael J.</creator><creator>Clayton, Robert N.</creator><creator>Lewis, Roy S.</creator><creator>Amari, Sachiko</creator><creator>Gallino, Roberto</creator><creator>Lugaro, Maria</creator><general>Elsevier Ltd</general><scope>AAYXX</scope><scope>CITATION</scope><scope>OTOTI</scope></search><sort><creationdate>20030901</creationdate><title>Barium isotopes in individual presolar silicon carbide grains from the Murchison meteorite</title><author>Savina, Michael R. ; Davis, Andrew M. ; Tripa, C.Emil ; Pellin, Michael J. ; Clayton, Robert N. ; Lewis, Roy S. ; Amari, Sachiko ; Gallino, Roberto ; Lugaro, Maria</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a469t-2bd72b4d3b3ba7c35164fd79cd39993237b817781cda0428e8eb1aefeb2ce5cb3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2003</creationdate><topic>BARIUM</topic><topic>BARIUM ISOTOPES</topic><topic>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</topic><topic>GRAIN SIZE</topic><topic>IONIZATION</topic><topic>MASS SPECTROSCOPY</topic><topic>METEORITES</topic><topic>MOLYBDENUM</topic><topic>NUCLEOSYNTHESIS</topic><topic>S PROCESS</topic><topic>SILICON CARBIDES</topic><topic>STARS</topic><topic>STRONTIUM</topic><topic>ZIRCONIUM</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Savina, Michael R.</creatorcontrib><creatorcontrib>Davis, Andrew M.</creatorcontrib><creatorcontrib>Tripa, C.Emil</creatorcontrib><creatorcontrib>Pellin, Michael J.</creatorcontrib><creatorcontrib>Clayton, Robert N.</creatorcontrib><creatorcontrib>Lewis, Roy S.</creatorcontrib><creatorcontrib>Amari, Sachiko</creatorcontrib><creatorcontrib>Gallino, Roberto</creatorcontrib><creatorcontrib>Lugaro, Maria</creatorcontrib><creatorcontrib>Argonne National Lab. (ANL), Argonne, IL (United States)</creatorcontrib><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>Geochimica et cosmochimica acta</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Savina, Michael R.</au><au>Davis, Andrew M.</au><au>Tripa, C.Emil</au><au>Pellin, Michael J.</au><au>Clayton, Robert N.</au><au>Lewis, Roy S.</au><au>Amari, Sachiko</au><au>Gallino, Roberto</au><au>Lugaro, Maria</au><aucorp>Argonne National Lab. (ANL), Argonne, IL (United States)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Barium isotopes in individual presolar silicon carbide grains from the Murchison meteorite</atitle><jtitle>Geochimica et cosmochimica acta</jtitle><date>2003-09-01</date><risdate>2003</risdate><volume>67</volume><issue>17</issue><spage>3201</spage><epage>3214</epage><pages>3201-3214</pages><issn>0016-7037</issn><eissn>1872-9533</eissn><abstract>Barium isotopic compositions of single 2.3–5.3 μm presolar SiC grains from the Murchison meteorite were measured by resonant ionization mass spectrometry. Mainstream SiC grains are enriched in
s-process barium and show a spread in isotopic composition from solar to dominantly
s-process. In the relatively coarse grain size fraction analyzed, there are large grain-to-grain variations of barium isotopic composition. Comparison of single grain data with models of nucleosynthesis in asymptotic giant branch (AGB) stars indicates that the grains most likely come from low mass carbon-rich AGB stars (1.5 to 3 solar masses) of about solar metallicity and with approximately solar initial proportions of
r- and
s-process isotopes. Measurements of single grains imply a wide variety of neutron-to-seed ratios, in agreement with previous measurements of strontium, zirconium and molybdenum isotopic compositions of single presolar SiC grains.</abstract><cop>United States</cop><pub>Elsevier Ltd</pub><doi>10.1016/S0016-7037(03)00083-8</doi><tpages>14</tpages><oa>free_for_read</oa></addata></record> |
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| source | ScienceDirect Journals (5 years ago - present) |
| subjects | BARIUM BARIUM ISOTOPES CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS GRAIN SIZE IONIZATION MASS SPECTROSCOPY METEORITES MOLYBDENUM NUCLEOSYNTHESIS S PROCESS SILICON CARBIDES STARS STRONTIUM ZIRCONIUM |
| title | Barium isotopes in individual presolar silicon carbide grains from the Murchison meteorite |
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