Quasi-Particle Alignment and Magnetic Rotation Investigated by g-Factor Measurements

【摘要】：正Quasi-particle alignment and magnetic rotation are investigated at high spins in a mass region of A=80 by g-factor measurements using the TMF-IMPAD technique.Proton and/or neutron alignments are observed in ~(82)Sr,~(83)Y,~(84)Zr,~(85)Zr and ~(86)Zr,which lead to different patterns of variation of g-factor with spin.For the nuclides with Z=40 neutron ahgnment follows proton alignment in ~(84)Zr and ~(85)Zr,while proton alignment follows neutron alignment in ~(86)Zr.For the nuclides with N=44 proton aligns only in ~(82)Sr,neutron alignment follows proton alignment in ~(83)Y and ~(84)Zr.Both measured g-factors and calculated shears angles decreases with the spin increasing along magnetic rotational band in ~(85)Zr,revealing a step-by-step alignment of the valence protons and neutrons and providing unique evidence of the shears mechanism of magnetic rotation.