Exploring the Low-Z Shore of the Island of Inversion at N=19

Document Type

Article

Publication Date

1-19-2012

Publication Source

Physical Review Letters

Volume Number

108

Issue Number

3

Publisher

American Physical Society

ISSN

0031-9007

Abstract

The technique of invariant mass spectroscopy has been used to measure, for the first time, the ground state energy of neutron-unbound (28)F, determined to be a resonance in the (27)F + n continuum at 220(50) keV. States in (28)F were populated by the reactions of a 62 MeV/u (29)Ne beam impinging on a 288 mg/cm(2) beryllium target. The measured (28)F 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 (28)F and establishing a low-Z boundary of the island of inversion for N = 19 isotones.

Keywords

Neutron-rich nuclei, Particle stability, Sweeper magnet, Exotic nuclei, Shell closure, Beta-decay, Fragmentation, Spectroscopy, Isotopes, N=20

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