An above-barrier narrow resonance in ${}^{15}$F

Abstract

Intense and purified radioactive beam of post-accelerated ${}^{14}$O was used to study the low-lying states in the unbound ${}^{15}$F nucleus. Exploiting resonant elastic scattering in inverse kinematics with a thick target, the second excited state, a resonance at E$\_R$=4.757(6)(10)~MeV with a width of $\Gamma$=36(5)(14)~keV was measured for the first time with high precision. The structure of this narrow above-barrier state in a nucleus located two neutrons beyond the proton drip line was investigated using the Gamow Shell Model in the coupled channel representation with a ${}^{12}$C core and three valence protons. It is found that it is an almost pure wave function of two quasi-bound protons in the $2s\_1/2$ shell.

arXiv comment8 pages, 2 figures, 1 table, Submitted to Phys. Lett. B

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• From bound states to the continuum
• Nuclear Dynamics and Reactions in the Ab Initio Symmetry-Adapted Framework
• Two-proton emission and related phenomena
• Convenient location of a near-threshold proton-emitting resonance in ${}^{11}$B
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