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Spectroscopy of neutron-unbound $^{27,28}$F

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arxiv 1203.1369 v1 pith:5FCQKT5E submitted 2012-03-07 nucl-ex

G. Christian , N. Frank , S. Ash , T. Baumann , P. A. DeYoung , J. E. Finck , A. Gade , G. F. Grinyer
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B. Luther M. Mosby S. Mosby J. K. Smith J. Snyder A. Spyrou M. J. Strongman M. Thoennessen M. Warren D. Weisshaar A. Wersal
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keywords stategroundunderlinefirstneutron-unboundobservedreportresonance
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abstract

The ground state of $^{28}$F has been observed as an unbound resonance $2\underline{2}0$ keV above the ground state of $^{27}$F. Comparison of this result with USDA/USDB shell model predictions leads to the conclusion that the $^{28}$F ground state is primarily dominated by $sd$-shell configurations. Here we present a detailed report on the experiment in which the ground state resonance of $^{28}$F was first observed. Additionally, we report the first observation of a neutron-unbound excited state in $^{27}$F at an excitation energy of $25\underline{0}0 (2\underline{2}0)$ keV.

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