Low-lying states inMg32studied by proton inelastic scattering

Proton inelastic scattering on the neutron-rich nucleus {sup 32}Mg has been studied at 46.5 MeV/nucleon in inverse kinematics. Populated states were identified by measuring de-excitation {gamma} rays, in which five new states were found by {gamma}-{gamma} coincidence analyses. By analyzing the angular differential cross sections via coupled-channel calculations, their spins and parities were constrained and the amplitudes for each transition were extracted. The spin and parity of the 2321-keV state was assigned as 4{sub 1}{sup +}. The ratio between the energies of the 2{sub 1}{sup +} and 4{sub 1}{sup +} states indicates that {sup 32}Mg is a transitional nucleus rather than an axially deformed rigid rotor. The collectivities in the nucleus {sup 32}Mg with N=20 are discussed based on the results obtained in the present experiment.