Extension of the N=40 Island of Inversion towards N=50: Spectroscopy of Cr66, Fe70,72

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.
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Submitted on : Friday, December 4, 2015 - 11:54:13 AM
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C. Santamaria, C. Louchart, A. Obertelli, V. Werner, P. Doornenbal, et al.. Extension of the N=40 Island of Inversion towards N=50: Spectroscopy of Cr66, Fe70,72. Physical Review Letters, American Physical Society, 2015, 115 (19), pp.192501. ⟨10.1103/PhysRevLett.115.192501⟩. ⟨in2p3-01238085⟩

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