New narrow resonances observed in the unbound nucleus F 15

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Abstract

The structure of the unbound F15 nucleus is investigated using the inverse kinematics resonant scattering of a radioactive O14 beam impinging on a CH2 target. The analysis of H1(O14,p)O14 and H1(O14,2p)N13 reactions allowed the confirmation of the previously observed narrow 1/2- resonance, near the two-proton decay threshold, and the identification of two new narrow 5/2- and 3/2- resonances. The newly observed levels decay by 1p emission to the ground of O14, and by sequential 2p emission to the ground state of N13 via the 1- resonance of O14. Gamow shell model (GSM) analysis of the experimental data suggests that the wave functions of the 5/2- and 3/2- resonances may be collectivized by the continuum coupling to nearby 2p- and 1p-decay channels. The observed excitation function H1(O14,p)O14 and resonance spectrum in F15 are well reproduced in the unified framework of the GSM.

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Girard-Alcindor, V., Mercenne, A., Stefan, I., De Oliveira Santos, F., Michel, N., Płoszajczak, M., … Zielińska, M. (2022). New narrow resonances observed in the unbound nucleus F 15. Physical Review C, 105(5). https://doi.org/10.1103/PhysRevC.105.L051301

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