Abstract
The masses of the neutron-rich copper isotopes ^{75-79}Cu are determined using the precision mass spectrometer ISOLTRAP at the CERN-ISOLDE facility. The trend from the new data differs significantly from that of previous results, offering a first accurate view of the mass surface adjacent to the Z=28, N=50 nuclide ^{78}Ni and supporting a doubly magic character. The new masses compare very well with large-scale shell-model calculations that predict shape coexistence in a doubly magic ^{78}Ni and a new island of inversion for Z<28. A coherent picture of this important exotic region begins to emerge where excitations across Z=28 and N=50 form a delicate equilibrium with a spherical mean field.
Highlights
Binding Energy of 79Cu: Probing the Structure of the Doubly Magic 78Ni from Only One Proton Away
A coherent picture of this important exotic region begins to emerge where excitations across Z 1⁄4 28 and N 1⁄4 50 form a delicate equilibrium with a spherical mean field
Over the years experiments with radioactive-ion beams have shown that the stability of nuclear magic numbers breaks down in light, exotic nuclei as reviewed in Ref. [1]
Summary
PHYSICAL REVIEW LETTERS week ending 10 NOVEMBER 2017 from the Coulomb-excitation study of the neighboring zinc isotopes: with an inert 56Ni core a very large proton effective charge was necessary to correctly reproduce the experimental quadrupole transition probabilities, suggesting important proton-core polarization [13]. The purified copper-ion ensemble was cooled and recentered for 80 ms in the helium buffer-gas-filled preparation Penning trap and subsequently injected in the precision Penning trap, where high-precision mass measurements were carried out by time-of-flight ion-cyclotron resonance [29]. Three such resonances were recorded for 75Cuþ, three for 76Cuþ, four for 77Cuþ, and one for 78Cuþ, which is shown in. The necessity of masses measured with high accuracy, as well as high precision, is clearly illustrated and the present results indicate the success of the new calculations over the ones with no Z 1⁄4 28 and/or N 1⁄4 50 core excitations
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