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Interplay between nuclear shell evolution and shape deformation revealed by the magnetic moment of $^{75}$Cu
- Source :
- Nature Phys., Nature Phys., 2019, 15 (4), pp.321-325. ⟨10.1038/s41567-018-0410-7⟩, Nature Physics, Nature Physics, Nature Publishing Group, 2019, 15 (4), pp.321-325. ⟨10.1038/s41567-018-0410-7⟩, Nature Physics, 2019, 15 (4), pp.321-325. ⟨10.1038/s41567-018-0410-7⟩
- Publication Year :
- 2019
- Publisher :
- HAL CCSD, 2019.
-
Abstract
- Exotic nuclei are characterized by a number of neutrons (or protons) in excess relative to stable nuclei. Their shell structure, which represents single-particle motion in a nucleus, may vary due to nuclear force and excess neutrons, in a phenomenon called shell evolution. This effect could be counterbalanced by collective modes causing deformations of the nuclear surface. Here, we study the interplay between shell evolution and shape deformation by focusing on the magnetic moment of an isomeric state of the neutron-rich nucleus 75Cu. We measure the magnetic moment using highly spin-controlled rare-isotope beams and achieving large spin alignment via a two-step reaction scheme that incorporates an angular-momentum-selecting nucleon removal. By combining our experiments with numerical simulations of many-fermion correlations, we find that the low-lying states in 75Cu are, to a large extent, of single-particle nature on top of a correlated 74Ni core. We elucidate the crucial role of shell evolution even in the presence of the collective mode, and within the same framework, we consider whether and how the double magicity of the 78Ni nucleus is restored, which is also of keen interest from the perspective of nucleosynthesis in explosive stellar processes.<br />10 pages, 4 figures
- Subjects :
- Physics
Magnetic moment
Nuclear Theory
Shell (structure)
General Physics and Astronomy
FOS: Physical sciences
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
01 natural sciences
Molecular physics
010305 fluids & plasmas
medicine.anatomical_structure
Nucleosynthesis
0103 physical sciences
medicine
Nuclear force
Neutron
Nuclear Experiment (nucl-ex)
010306 general physics
Nucleon
Spin (physics)
Nuclear Experiment
Nucleus
Subjects
Details
- Language :
- English
- ISSN :
- 17452473 and 14764636
- Database :
- OpenAIRE
- Journal :
- Nature Phys., Nature Phys., 2019, 15 (4), pp.321-325. ⟨10.1038/s41567-018-0410-7⟩, Nature Physics, Nature Physics, Nature Publishing Group, 2019, 15 (4), pp.321-325. ⟨10.1038/s41567-018-0410-7⟩, Nature Physics, 2019, 15 (4), pp.321-325. ⟨10.1038/s41567-018-0410-7⟩
- Accession number :
- edsair.doi.dedup.....046465c76f731451528748c1463c04bc