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.
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F. de Grancey, A. Mercenne, F. de Oliveira Santos, T. Davinson, O. Sorlin, et al.. An above-barrier narrow resonance in $^{15}$F. Physics Letters B, Elsevier, 2016, 758, pp.26-31. ⟨10.1016/j.physletb.2016.04.051⟩. ⟨in2p3-01280743⟩

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