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Enhanced Core Polarization in 70Ni and 74Zn

Abstract : The reduced transition probabilities B(E2;0+\rightarrow 2+_1) of the neutron-rich 74Zn and 70Ni nuclei have been measured by Coulomb excitation in a 208Pb target at intermediate energy. These nuclei have been produced at Grand Accélérateur National d'Ions Lourds via interactions of a 60A MeV 76Ge beam with a Be target. The B(E2) value for 70Ni_42 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 74Zn 44. The enhanced proton core polarization in 70Ni is attributed to the monopole interaction between the neutron in the g_9/2 and protons in the f_7/2 and f_5/2 spin-orbit partner orbitals. This interaction could result in a weakening of magicity in 78Ni_50.
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http://hal.in2p3.fr/in2p3-00080627
Contributor : Michel Lion Connect in order to contact the contributor
Submitted on : Monday, June 19, 2006 - 5:04:11 PM
Last modification on : Sunday, June 26, 2022 - 11:45:55 AM

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O. Perru, O. Sorlin, S. Franchoo, F. Azaiez, E. Bouchez, et al.. Enhanced Core Polarization in 70Ni and 74Zn. Physical Review Letters, American Physical Society, 2006, 96, pp.232501. ⟨10.1103/PhysRevLett.96.232501⟩. ⟨in2p3-00080627⟩

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