Structural Changes of Hot Rotating Neutron Deficient Doubly Magic Nucleus sn

This paper presents results of statistical calculations of single-particle characteristics of nuclei, excitation energies and shape transition in the Sn isotope with neutron number 50, which is the extremely neutron deficient isotope. It is a very rare and unstable isotope which does not occur in nature, but only on the surface of exploding stars for less than a second. The spherical nucleus at its ground state is more stable in its shape against temperature and angular momentum. The decrease in proton separation energy with increasing spin around Ex = 14MeV at spin J ≈ 30h may be due to the transition from Sn to In through the transformation of a single proton in 100Sn to a neutron via the nuclear process of decay.