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dc.creatorDZICZKANIEC, MARLENE
dc.date.accessioned 2007-05-09T19:24:23Z
dc.date.available 2007-05-09T19:24:23Z
dc.date.issued 1980
dc.identifier.citation DZICZKANIEC, MARLENE. "ISOTOPIC ANOMALIES FROM NUCLEAR PROCESSES IN STARS." (1980) Diss., Rice University. https://hdl.handle.net/1911/15544.
dc.identifier.urihttps://hdl.handle.net/1911/15544
dc.description.abstract Specific nucleosynthetic environments are examined as the sources for the anomalous xenon observed in meteorite samples. A simplified nuclear network is used to allow rapid estimation of isotopic abundances over a wide range of stellar conditions. In the zone of oxygen burning outside a stellar core that is in the silicon burning phase of energy generation, photodisintegration of xenon seed isotopes is shown to be a potential source of an overabundance of the p-isotopes of xenon. The result ('124)Xe/('126)Xe > 1 can be obtained if theoretical calculations systematically overestimate photo-alpha emission rates of certain p-isotopes of elements in the xenon region of the chart of the nuclides. Anomalies in the abundances of the heaviest xenon isotopes are shown to be a possible consequence of neutron capture reactions during explosive carbon burning in a supernova. Overabundances of ('136)Xe relative to ('134)Xe are the result of the low neutron-capture rates of N = 82 nuclei and the high photo-neurtron emission rates of N= 38 nuclei. Isotopic abundance signatures in the elements krypton, tellurium and osmium that are correlated with anomalous xenon are shown to be a plausible result of nuclear processing in the same environments that may produce anomalous xenon. The relative abundance of ('129)I associated with anomalous xenon is also examined, and predictions for anomalies in other elements based on the models presented here are given.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.subjectGeological Survey
dc.title ISOTOPIC ANOMALIES FROM NUCLEAR PROCESSES IN STARS
dc.type Thesis
dc.type.material Text
thesis.degree.department Space Science
thesis.degree.discipline Natural Sciences
thesis.degree.grantor Rice University
thesis.degree.level Doctoral
thesis.degree.name Doctor of Philosophy
dc.identifier.callno Thesis Sp. Sci. 1980 Dziczkaniec


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