Enhanced core polarization in Ni70 and Zn74

O. Perru, O. Sorlin, S. Franchoo, F. Azaiez, E. Bouchez, C. Bourgeois, A. Chatillon, J. M. Daugas, Z. Dlouhy, Zs Dombrádi, C. Donzaud, L. Gaudefroy, H. Grawe, S. Grévy, D. Guillemaud-Mueller, F. Hammache, F. Ibrahim, Y. Le Coz, S. M. Lukyanov, I. MateaJ. Mrazek, F. Nowacki, Yu E. Penionzhkevich, F. De Oliveira Santos, F. Pougheon, M. G. Saint-Laurent, G. Sletten, M. Stanoiu, C. Stodel, Ch Theisen, D. Verney

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Abstract

The reduced transition probabilities B(E2;0+→21+) of the neutron-rich Zn74 and Ni70 nuclei have been measured by Coulomb excitation in a Pb208 target at intermediate energy. These nuclei have been produced at Grand Accélérateur National d'Ions Lourds via interactions of a 60AMeV Ge76 beam with a Be target. The B(E2) value for Ni4270 is unexpectedly large, which indicates that neutrons added above N=40 strongly polarize the Z=28 proton core. In the Zn isotopic chain, the steep rise of B(E2) values beyond N=40 continues up to Zn4474. The enhanced proton core polarization in Ni70 is attributed to the monopole interaction between the neutron in the g9/2 and protons in the f7/2 and f5/2 spin-orbit partner orbitals. This interaction could result in a weakening of magicity in Ni5078.

Original languageEnglish
Article number232501
JournalPhysical review letters
Volume96
Issue number23
DOIs
Publication statusPublished - Jun 19 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Perru, O., Sorlin, O., Franchoo, S., Azaiez, F., Bouchez, E., Bourgeois, C., Chatillon, A., Daugas, J. M., Dlouhy, Z., Dombrádi, Z., Donzaud, C., Gaudefroy, L., Grawe, H., Grévy, S., Guillemaud-Mueller, D., Hammache, F., Ibrahim, F., Le Coz, Y., Lukyanov, S. M., ... Verney, D. (2006). Enhanced core polarization in Ni70 and Zn74. Physical review letters, 96(23), [232501]. https://doi.org/10.1103/PhysRevLett.96.232501