| Affiliation: | (1) School of Physics, Peking University, 100871 Beijing, PRC;(2) Institute of Theoretical Physics, Chinese Academy of Sciences, 100080 Beijing, PRC;(3) Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, 730000 Lanzhou, PRC;(4) Research Center for Nuclear Physics (RCNP), Osaka University, 567-0047 Osaka, Ibaraki, Japan |
| Abstract: | The evolution of shape from the spherical to the axially deformed shapes in the Sm isotopes is investigated microscopically in relativistic mean-field theory. The microscopic and self-consistent quadrupole deformation constrained relativistic mean-field calculations show a clear shape change for the even-even Sm isotopes with N = 82-96. The potential surfaces for 148Sm, 150Sm and 152Sm are found to be relatively flat, which may be the possible critical-point nuclei. By examining the single-particle spectra and nearest-neighbor spacing distribution of the single-particle levels, one finds that the single-particle levels in 148Sm , 150Sm, and 152Sm distribute more uniformly. |
