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Coulomb Excitation of Neutron-Rich Zn Isotopes: First Observation of the 2+_1 State in 80Zn

Abstract : Neutron-rich, radioactive Zn isotopes were investigated at the Radioactive Ion Beam facility REX-ISOLDE (CERN) using low-energy Coulomb excitation. The energy of the 2 state in 78Zn could be firmly established and for the first time the 2+0 transition in 80Zn was observed at 1492(1) keV. B(E2,20) values were extracted for 74,76,78,80Zn and compared to large scale shell model calculations. With only two protons outside the Z=28 proton core, 80Zn is the lightest N=50 isotone for which spectroscopic information has been obtained to date. Two sets of advanced shell model calculations reproduce the observed B(E2) systematics. The results for N=50 isotones indicate a good N=50 shell closure and a strong Z=28 proton core polarization. The new results serve as benchmarks to establish theoretical models, predicting the nuclear properties of the doubly magic nucleus 78Ni.
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Submitted on : Wednesday, October 3, 2007 - 3:05:58 PM
Last modification on : Monday, November 16, 2020 - 12:54:04 PM

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J. van de Walle, F. Aksouh, F. Ames, T. Behrens, V. Bildstein, et al.. Coulomb Excitation of Neutron-Rich Zn Isotopes: First Observation of the 2+_1 State in 80Zn. Physical Review Letters, American Physical Society, 2007, 99, pp.142501. ⟨10.1103/PhysRevLett.99.142501⟩. ⟨in2p3-00176426⟩

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