An above-barrier narrow resonance in 15F

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Intense and purified radioactive beam of post-accelerated 14O was used to study the low-lying states in the unbound 15F nucleus. Exploiting resonant elastic scattering in inverse kinematics with a thick target, the second excited state, a resonance at ER=4.757(6)(10) MeV with a width of Γ=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 12C core and three valence protons. It is found that it is an almost pure wave function of two quasi-bound protons in the 2s1/2 shell.




de Grancey, F., Mercenne, A., de Oliveira Santos, F., Davinson, T., Sorlin, O., Angélique, J. C., … Wolski, R. (2016). An above-barrier narrow resonance in 15F. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 758, 26–31.

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