Abstract :
Neutron-capture elements have been detected in several metal-deficient halo stars with metallicity of [Fe/H] ∼ −1.5 − −3.0. These detections have indicated that the observed abundance pattern of heavy neutron-capture elements is very similar to that of the solar r-process elements for the mass region 56 < Z < 70. They have also shown, on the other hand, that the abundance of light neutron capture elements with Z < 56 have a large scattering. In this paper, we discuss the mechanism of this universality of the pattern and the possible way to set restriction on the nuclear mass models by reproducing this observed universality. Moreover, we present a possible explanation of the scattering of light elements abundances.
