Published in
American Physical Society, Physical Review Letters, 19(115)
DOI: 10.1103/physrevlett.115.192501
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Extension of theN=40Island of Inversion towardsN=50: Spectroscopy ofCr66,Fe70,72
,
D. Calvet,
F. Château,
A. Corsi ,
A. Delbart,
J.-M. Gheller,
A. Gillibert,
T. Isobe
and other authors.
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Abstract
We report on the measurement of the first 2+ and 4+ states of Cr66 and Fe70,72 via in-beam γ-ray spectroscopy. The nuclei of interest were produced by (p,2p) reactions at incident energies of 260 MeV/nucleon. The experiment was performed at the Radioactive Isotope Beam Factory, RIKEN, using the DALI 2γ-ray detector array and the novel MINOS device, a thick liquid hydrogen target combined with a vertex tracker. A low-energy plateau of 2+1 and 4+1 energies as a function of the neutron number was observed for N≥38 and N≥40 for even-even Cr and Fe isotopes, respectively. State-of-the-art shell model calculations with a modified Lenzi-Nowacki-Poves-Sieja (LNPS) interaction in the pfg9/2d5/2 valence space reproduce the observations. Interpretation within the shell model shows an extension of the island of inversion at N=40 for more neutron-rich isotopes towards N=50.