Terrestrial ℗ℓNe and the accretion time of the earth

dc.contributor.advisorHeymann, Dieteren_US
dc.creatorPalma, Russell L.en_US
dc.date.accessioned2018-12-18T21:17:27Zen_US
dc.date.available2018-12-18T21:17:27Zen_US
dc.date.issued1978en_US
dc.description.abstractThe atmospheric composition of neon is considered along the lines of the multicomponent theory for that gas. It is found that an excess amount of ^Ne is indicated if the terrestrial values of the 2^Ne/22Ne and 2^Ne/22Ne ratios are taken to be the result of mixtures of the components Ne-E and Ne-B or Ne-E and Ne$w. This excess ranges from 9-17% of the Ne presently in the earth's atmosphere. Production rates for 21Ne by galactic cosmic ray irradiation are calculated from consideration of meteorite and lunar drill core data. The Ne excess indicated by the selected component mixing lines places constraints on the mass distribution of the earth's protoplanetary bodies and their accretion times. The formulation developed by Safronov and Wetherill for the formation interval of the earth yields a result in concordance with this possible 21^Ne excess. Solar cosmic rays and the influx of meteroids are found to be of negligible importance in the production of Ne, as are all nuclear reactions in the earth after formation, excepting 18O(a ,n)21Ne. This last reaction contributes approximately 2.1% of all Ne over the lifetime of the earth. The possible contribution to terrestrial neon from the passage of the solar system through dense interstellar clouds is discussed, as is the retention of neon during the accretionary process.en_US
dc.format.digitalOriginreformatted digitalen_US
dc.format.extent75 ppen_US
dc.identifier.callnoThesis Sp. Sci. 1978 Palmaen_US
dc.identifier.citationPalma, Russell L.. "Terrestrial ℗ℓNe and the accretion time of the earth." (1978) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/104103">https://hdl.handle.net/1911/104103</a>.en_US
dc.identifier.digitalRICE1730en_US
dc.identifier.urihttps://hdl.handle.net/1911/104103en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.titleTerrestrial ℗ℓNe and the accretion time of the earthen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentSpace Scienceen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
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