Exploring the low-Z shore of the Island of inversion at N=19

G. Christian*, N. Frank, S. Ash, T. Baumann, D. Bazin, J. Brown, P. A. Deyoung, J. E. Finck, A. Gade, G. F. Grinyer, A. Grovom, J. D. Hinnefeld, E. M. Lunderberg, B. Luther, M. Mosby, S. Mosby, T. Nagi, G. F. Peaslee, W. F. Rogers, J. K. SmithJ. Snyder, A. Spyrou, M. J. Strongman, M. Thoennessen, M. Warren, D. Weisshaar, A. Wersal

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

The technique of invariant mass spectroscopy has been used to measure, for the first time, the ground state energy of neutron-unbound F28, determined to be a resonance in the F27+n continuum at 22 0(5 0)keV. States in F28 were populated by the reactions of a 62MeV/u Ne29 beam impinging on a 288mg/cm2 beryllium target. The measured F28 ground state energy is in good agreement with USDA/USDB shell model predictions, indicating that pf shell intruder configurations play only a small role in the ground state structure of F28 and establishing a low-Z boundary of the island of inversion for N=19 isotones.

Original languageEnglish (US)
Article number032501
JournalPhysical review letters
Volume108
Issue number3
DOIs
StatePublished - Jan 19 2012
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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