Excitation Of M1 States In Ni-58 And Ni-60 By 65-Mev Polarized Proton Inelastic-Scattering

Abstract We studied the 1+ states in 58Ni and 60Ni by using the 58 Ni ( p , p ′) 58 Ni and 60 Ni ( p , p ′) 60 Ni reactions at 65 MeV with high resolution, in order to search for the fragmentation of the 1+ states at excitation energies of Ex = 7–11 MeV. From the similarity in experimental shapes of both cross sections and analyzing powers for the well-known 1+ states and from comparison with microscopic DWBA calculations under the assumptions of pure (f 7 2 −1 f 5 2 ) and ν(p 3 2 P 1 2 ) configurations, four states in 58Ni and one state in 60Ni have been identified as the candidates of the 1+ states of a (f 7 2 −1 f 5 2 ) or ν(p 3 2 P 1 2 ) configuration in the M1 giant resonance region of Ex = 7–10 MeV, though the strengths are very weak.