ABSTRACT

The r-process-like isotopic anomalies observed in Ba, Nd, and Sm from the Allende inclusions EK1-4-1 and Cl can be explained as due to an ‘early’ irradiation of the solar system material, which also produced radionuclides such as ²⁶Al, ¹⁰⁷Pd and ¹²⁹I. The apparent conflict between the time scales inferred from the cosmochronometers ¹¹⁹I, ²⁴⁴Pu and ²⁶Al reported by LEE et al. (1978) stems from the fact that these investigators have attempted to explain the isotopic anomalies in terms of a wholesale addition of the nucleosynthesis products from nearby stars to the solar nebula.