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

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arxiv 1603.00436 v1 pith:R5IAKFCO submitted 2016-03-01 nucl-ex

F. De Grancey (GANIL) , A. Mercenne (GANIL) , F. De Oliveira Santos (GANIL) , T. Davinson , O. Sorlin (GANIL) , J.C. Angélique (LPCC) , M. Assié (IPNO , Ganil)
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E. Berthoumieux (IRFU) R. Borcea A. Buta I. Celikovic V. Chudoba J.M. Daugas (DAM) G. Dumitru M. Fadil (GANIL) S. Grévy (GANIL CENBG) J. Kiener A. Lefebvre-Schuhl (CSNSM) N. Michel (GANIL) J. Mrazek F. Negoita J. Okolowicz D. Pantelica M.G. Pellegriti (GANIL) L. Perrot (GANIL IPNO) M. Ploszajczak (GANIL) G. Randisi (GANIL) I. Ray (GANIL) O. Roig (DAM) F. Rotaru M.G. Saint Laurent (GANIL) N. Smirnova (CENBG) M. Stanoiu I. Stefan (GANIL C. Stodel (GANIL) K. Subotic V. Tatischeff (CSNSM) J.C. Thomas (GANIL) P. Ujic R. Wolski
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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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Cited by 1 Pith paper

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  1. Constructing Effective Interactions via Projection-Based Inversion

    nucl-th 2026-08 conditional novelty 6.0 of 10

    Discrete energy levels from truncated many-body calculations are inverted, via a Multiparameter Eigenvalue Problem emulator, into effective contact interactions that yield scattering phase shifts and resonance predictions.

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