太阳系原始同位素组成是研究太阳系起源和演化的基础。评述了太阳星云的
原始放射性核素丰度特征及解释此丰度特征的分子云自增丰模型、AGB星污染模型
和散裂反应模型。陨石包体中前太阳矿物颗粒的同位素组成异常表明，前太阳颗
粒中低密度石墨、X型碳硅石可能来源于超新星爆发，而AGB星或红巨星被认为是
尖晶石和碳硅石的最可能的恒星来源。太阳系中比较特殊的氖和氙的同位素组成
异常也与超新星爆发密切相关。
Abundance Characteristic and Synthesis Scenario of the Galactic Chemical Elements (Ⅱ):
On the Isotopic Anomalies of Solar System
Chang Ruixiang Hou Jinliang Fu Chengqi
(Shanghai Astronomical Observatory, The Chinese Academy of Sciences, Shanghai 200030)
Abstract
The isotopic composition of Solar system is the base for studying the origin and evolution of the solar
system. The present study reviewed the abundance distribution of extinct radio-
nuclides in the solar system and the proposed interpretations: (1) self-contamination of the protosolar cloud
by supernovae; (2) contamination by a passing AGB star and (3) high-flux cosmic-ray
spallation in the protosolar cloud. Isotopic compositions of presolar grains in primitive
meteorites suggest that low density graphite grains and the rare X type SiC grains come
from supernovae, yet AGB stars and red gaint stars are stellar sources for SiC grains and
corundum grains. Compositions of isotopically anomalous HL-Xe carried by interstellar
diamonds and Ne-E carried by graphite particles in meteorites are strongly correlated to
the supernova environment.
Key words naclear reactions, nucleosynthesis,
abundances---solar system: formation---interplanetary medium