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Physical Review C 81 (2010) 061301
Onset of collectivity in neutron-rich Fe isotopes: Toward a new island of inversion?
J. Ljungvall1, 2, 3, A. Gorgen2, A. Obertelli2, W. Korten2, E. Clément1, G. De France1, A. Burger, J.-P. Delaroche, A. Dewald, A. Gadea, L. Gaudefroy4, M. Girod4, M. Hackstein, J. Libert, D. Mengoni, F. Nowacki5, T. Pissulla, A. Poves, F. Recchia, M. Rejmund1, W. Rother, E. Sahin, C. Schmitt1, A. Shrivastava1, K. Sieja, J. J. Valiente-Dobon, K.O. Zell, M. Zielinska
(2010)

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.
1 :  GANIL - Grand Accélérateur National d'Ions Lourds
2 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
3 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
4 :  CEA/DAM - Direction des applications militaires
5 :  IPHC - Institut Pluridisciplinaire Hubert Curien
Physique/Physique Nucléaire Expérimentale
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