Deuteronomy. Synthesis of Deuterons and the Light Nuclei during the Early History of the Solar System

Details Deuteronomy. Synthesis of Deuterons and the Light Nuclei during the Early History of the Solar System Deuteronomy. Synthesis of Deuterons and the Light Nuclei during the Early History of the Solar System

Jul 1961

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1961amjph..29..393f&link_type=abstract

American Journal of Physics, Volume 29, Issue 7, pp. 393-403 (1961).

Physics

14

Scientific paper

Abundances in terrestrial and meteoritic matter indicate that the synthesis of deuterons and of the isotopes of lithium, beryllium, and boron occurred during an intermediate stage in the early history of the solar system. In this intermediate stage, the planetary material had become largely separated, but not completely, from the hydrogen which was the main constituent of primitive solar material. Appropriate physical conditions were satisfied by solid planetesimals with dimensions of the order of 10 m and consisting of silicates and oxides of the metals embedded in an icy matrix. The synthesis occurred through spallation and neutron reactions induced in the outer layers of the planetesimals by the bombardment of high-energy charged particles accelerated in magnetic flares at the surface of the condensing sun. The importance of the (n,α) reactions on Li6 and B10 is indicated by the relatively low abundances of these two nuclei. Anomalous abundances of Xe129 and Ag107 observed in meteorites can be attributed to the decay of radioactive I129 and Pd107 produced in the planetesimals. The interval between the irradiation of the small planetesimals and the formation of large bodies in the solar system could not have exceeded 107 to 108 years.

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