Single-particle and collective motion for proton-rich nuclei in the upper pf shell - art. no. 021601

Based on available experimental data, a new set of Nilsson parameters is pr oposed for proton-rich nuclei with proton or neutron numbers 28 less than o r equal to N less than or equal to 40. The resulting single-particle spectr a are compared with these from relativistic and nonrelativistic mean field theories. Collective excitations in some even-even proton-rich nuclei in th e upper pf shell are investigated using the projected shell model with the new Nilsson basis. It is found that the regular bands are sharply disturbed by band crossings involving 1g(9/2) neutrons and protons. Physical quantit ies for exploring the nature of the band disturbance and the role of the 1g (9/2) single-particle are predicted, which may be tested by new experiments with radioactive beams.