Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2012-01-05
Physics
Nuclear Physics
Nuclear Experiment
5 pages, 4 figures, to be published in Phys. Rev. Lett
Scientific paper
The technique of invariant mass spectroscopy has been used to measure, for the first time, the ground state energy of neutron-unbound $^{28}\textrm{F},$ determined to be a resonance in the $^{27}\textrm{F} + n$ continuum at $2\underline{2}0 (\underline{5}0)$ keV. States in $^{28}\textrm{F}$ were populated by the reactions of a 62 MeV/u $^{29}\textrm{Ne}$ beam impinging on a 288 $\textrm{mg/cm}^2$ beryllium target. The measured $^{28}\textrm{F}$ 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 $^{28}\textrm{F}$ and establishing a low-$Z$ boundary of the island of inversion for N=19 isotones.
Ash S.
Baumann Thomas
Bazin Daniel
Brown Jacqueline
Christian George
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