Abstract
Quadrupole collectivity in the proximity of the doubly-magic shell closure at N = Z = 28 has been studied using intermediate-energy Coulomb excitation of 54,56,58Ni and 52Fe. The results will be summarized and discussed in comparison to large-scale shell model calculations.A complementary experimental approach sensitive to the single-particle structure of exotic nuclei, one-neutron knockout at intermediate beam energies, has been applied to the proton-rich N = 16 isotones 34Ar, 33Cl and 32S as well as to 32Ar where the knockout residue 31Ar is the last particle-bound Z = 18 isotope. The reduction of single-particle strength (‘‘quenching’’) compared to shell-model calculations using the USD interaction is discussed in the framework of correlation effects beyond effective-interaction theory.
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