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NUCLEOSYNTHESIS DURING THE EARLY HISTORY OF THE SOLAR SYSTEM,
PALOMAR OBSERVATORY PASADENA CALIF
Abundances in terrestrial and meteoritic matter indicate that the synthesis of D2, Li6, Li7, Be9, B10 and B11 and possibly C13 and N15 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 of dimensions from 1 to 50 metres consisting of silicates and oxides of the metals embedded in an icy matrix. The synthesis occurred through spallation and neutron reactions simultaneously induced in the outer layers of the planetesimals by the bombardment of high energy charged particles, mostly protons, accelerated in magnetic flares at the surface of the condensing Sun. The total particle energy was approximately 10 to the 45th power ergs while the average energy was close to 500 MeV per nucleon. Recent studies of the abundance of lithium in young T Tauri stars serve as the primary astronomical evidence for this point of view. The observed abundances of lithium and beryllium in the surface of the Sun are discussed in terms of the astronomical and nuclear considerations brought forward.
Pub. in Geophysical Journal (Gt. Brit.) v6 n2 p148-220 1962 (Copies available only to DDC users).
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