Structure of neutron-rich A»60 nuclei: A theoretical perspective,Y. Sun†, Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, China − One of the current nuclear structure studies focuses on the neutron-rich A»60 nuclei. Recent experiments have reached high-spin regions in some neutron-rich Cr, Mn, and Fe isotopes, which contain more useful information for understanding the importance of the neutron g9=2 orbital in nuclei with neutron number near 40. This talk will give a theoretical perspective. We have applied both projected shell model and large-scale spherical shell model to study low- and high-spin states in these nuclei [1-5]. The former model can use a large model space but requires an assumption of deformed single-particle states to start with. The latter model is more general but can only discuss the physics in a limited model space. We compare results of the two methods, and show that with increasing neutron number, evolution of shell gaps, shape changes, variation in high-spin levels and B(E2)'s, the high-K isomeric states, etc, are related to the neutron g9=2 orbit. We explain how a system with a soft core near the ground state stabilizes the shape with the aid of rotation. With participation of the neutron g9=2 particles, bands with features of magnetic rotation show up in this mass region.
 K. Kaneko, Y. Sun, M. Hasegawa, T. Mizusaki, Phys. Rev. C 78 (2008) 064312.
 Y. Sun, Y.-C. Yang, H.-L. Liu, K. Kaneko, M. Hasegawa, T. Mizusaki, Phys. Rev. C 80 (2009) 054306.
 Y.-C. Yang, Y. Sun, K. Kaneko, M. Hasegawa, Phys. Rev. C 82 (2010) 031304(R).
 Y.-C. Yang, H. Jin, Y. Sun, K. Kaneko, Phys. Lett. B 700 (2011) 44.
 H. Jin, Y. Sun, K. Kaneko, S. Tazaki, M. Hasegawa, to be published.
†Work supported by the National Natural Science Foundation of China under contract No.11135005 and 11075103.