Spectroscopy of 32Ne and the Island of Inversion
P. Doornenbal, H. Scheit, N. Aoi, S. Takeuchi, K. Li, E. Takeshita, H., Wang, H. Baba, S. Deguchi, N. Fukuda, H. Geissel, R. Gernh\"auser, J., Gibelin, I. Hachiuma, Y. Hara, C. Hinke, N. Inabe, K. Itahashi, S. Itoh, D., Kameda, S. Kanno, Y. Kawada, N. Kobayashi, Y. Kondo
TL;DR
This study presents the first spectroscopic analysis of 32Ne, revealing low-lying excited states that confirm the extension of the Island of Inversion to N=22 in neon isotopes, using advanced shell model comparisons.
Contribution
First spectroscopic measurement of 32Ne showing the extension of the Island of Inversion to N=22 through gamma-ray detection.
Findings
Observation of a 722 keV gamma-ray transition in 32Ne
Identification of the 2+ excited state in 32Ne
Confirmation that the Island of Inversion extends to N=22 in neon
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 de-excitation of the first J^pi = 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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