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Onset of collectivity in neutron-rich Fe isotopes: Toward a new island of inversion?

Abstract : The lifetimes of the first excited 2+ states in 62Fe and 64Fe have been measured for the first time using the recoil-distance Doppler shift method after multinucleon transfer reactions in inverse kinematics. A sudden increase of collectivity from 62Fe to 64Fe is observed. The experimental results are compared with new largescale shell-model calculations and Hartree-Fock-Bogolyubov–based configuration-mixing calculations using the Gogny D1S interaction. The results give a deeper understanding of the mechanism leading to an onset of collectivity near 68Ni, which is compared with the situation in the so-called island of inversion around 32Mg.
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Submitted on : Thursday, December 2, 2010 - 4:55:21 PM
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J. Ljungvall, A. Gorgen, A. Obertelli, W. Korten, E. Clément, et al.. Onset of collectivity in neutron-rich Fe isotopes: Toward a new island of inversion?. Physical Review C, American Physical Society, 2010, 81, pp.061301. ⟨10.1103/PhysRevC.81.061301⟩. ⟨in2p3-00495174⟩

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