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Exotic nuclei are characterized by a number of neutrons (or protons) inexcess relative to stable nuclei. Their shell structure, which representssingle-particle motion in a nucleus, may vary due to nuclear force and excessneutrons, in a phenomenon called shell evolution. This effect could becounterbalanced by collective modes causing deformations of the nuclearsurface. Here, we study the interplay between shell evolution and shapedeformation by focusing on the magnetic moment of an isomeric state of theneutron-rich nucleus 75Cu. We measure the magnetic moment using highlyspin-controlled rare-isotope beams and achieving large spin alignment via atwo-step reaction scheme that incorporates an angular-momentum-selectingnucleon removal. By combining our experiments with numerical simulations ofmany-fermion correlations, we find that the low-lying states in 75Cu are, to alarge extent, of single-particle nature on top of a correlated 74Ni core. Weelucidate the crucial role of shell evolution even in the presence of thecollective mode, and within the same framework, we consider whether and how thedouble magicity of the 78Ni nucleus is restored, which is also of keen interestfrom the perspective of nucleosynthesis in explosive stellar processes.

Interplay between nuclear shell evolution and shape deformation revealed by magnetic moment of 75Cu