R-Process Nucleosynthesis and Galactic Chemical Evolution of the Ba Peak Elements

宋汉峰; 张波; 张江; 吴海滨; 彭秋和

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R-Process Nucleosynthesis and Galactic Chemical Evolution of the Ba Peak Elements

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Nucleosynthesis yield is a very important parameter of the Galactic chemical evolution model.We adopt the same method as Tsujimoto to derive the r-process yields of various mass SNe Ⅱ at low metallicities from the new observed [Ba/Fe]-[Fe/H] trend.Furthermore,we present a new formula of r-process nucleosynthesis yields.We also consider the various neutron sources and set up four cases,namely A,B,C and D to calculate the abundance evolution of Ba peak elements in the solar neighbourhood.Our results show that the r-process could be associated with a secondary event in massive stars(i.e.,18M ＜ M ＜ 50 M).Therefore,the r-process could be associated with a secondary event in massiye stars.Both the neutron source and the seed nuclei must be freshly manufactured by the stars instead of depending upon the initial metallicity abundance.

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《中国物理快报：英文版》 |2003年第11期|2084-2087|共4页
作者
宋汉峰; 张波; 张江; 吴海滨; 彭秋和;
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Department of Physics,Hebei Normal University,Shijiazhuang 050016;

Department of Physics,Hebei Normal University,Shijiazhuang 050016;

Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator,Lanzhou 730000;

Department of Physics,Hebei Normal University,Shijiazhuang 050016;

Department of Physics,Hebei Normal University,Shijiazhuang 050016;

Institute of Physics,Shijiazhuang Teachers college,Shijiazhang 050081;

Department of Astronomy,Nanjing University,Nanjing 210093;

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R-Process Nucleosynthesis and Galactic Chemical Evolution of the Ba Peak Elements

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