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Spectroscopy of 32Ne and the “Island of Inversion”

Abstract : We report on the first spectroscopic study of the N=22 nucleus 32Ne at the newly completed RIKEN Radioactive Ion Beam Factory. A single gamma-ray line with an energy of 722(9) keV was observed in both inelastic scattering of a 226 MeV/u 32Ne beam on a carbon target and proton removal from 33Na at 245 MeV/u. This transition is assigned to the deexcitation of the first Jpi=2+ state in 32Ne to the 0+ ground state. Interpreted through comparison with state-of-the-art shell-model calculations, the low excitation energy demonstrates that the “island of inversion” extends to at least N=22 for the Ne isotopes.
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Submitted on : Thursday, July 23, 2009 - 11:52:42 AM
Last modification on : Tuesday, February 19, 2019 - 11:13:18 AM

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P. Doornenbal, H. Scheit, N. Aoi, S. Takeuchi, K. Li, et al.. Spectroscopy of 32Ne and the “Island of Inversion”. Physical Review Letters, American Physical Society, 2009, 103, pp.032501. ⟨10.1103/PhysRevLett.103.032501⟩. ⟨in2p3-00406584⟩

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