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Probing Nuclear forces beyond the drip-line using the mirror nuclei $^{16}$N and $^{16}$F

I. Stefan 1, 2 Francois de Oliveira Santos 1 O. Sorlin 1 T. Davinson 3 M. Lewitowicz 1 G. Dumitru 4 J.C. Angélique 5 M. Angélique E. Berthoumieux 6 C. Borcea 4 R. Borcea 4 A. Buta 4 J.M. Daugas 7 F. de Grancey 1 M. Fadil 1 S. Grévy 1 J. Kiener 8 A. Lefebvre-Schuhl 9 M. Lenhardt J. Mrazek 10 F. Negoita 4 D. Pantelica 4 M.G. Pellegriti 1 L. Perrot 1 M. Ploszajczak 1 O. Roig 7 M.G. Saint-Laurent 1 I. Ray 1 M. Stanoiu 4 C. Stodel 1 V. Tatischeff 9 J.C. Thomas 1
1 GANIL - Grand Accélérateur National d'Ions Lourds
2 IPNO - Institut de Physique Nucléaire d'Orsay
3 SUPA School of Physics and Astronomy [Edinburgh]
4 NIPNE - Horia Hulubei National Institute of Physics and Nuclear Engineering
5 LPCC - Laboratoire de physique corpusculaire de Caen
6 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
7 DAM/DIF - DAM Île-de-France
8 CSNSM AN
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière
9 CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière
10 Nuclear Physics Institute, ASCR Rez
Abstract : Radioactive beams of $^{14}$O and $^{15}$O were used to populate the resonant states 1/2$^+$, 5/2$^+$ and $0^-,1^-,2^-$ in the unbound $^{15}$F and $^{16}$F nuclei respectively by means of proton elastic scattering reactions in inverse kinematics. Based on their large proton spectroscopic factor values, the resonant states in $^{16}$F can be viewed as a core of $^{14}$O plus a proton in the 2s$_{1/2}$ or 1d$_{5/2}$ shell and a neutron in 1p$_{1/2}$. Experimental energies were used to derive the strength of the 2s$_{1/2}$-1p$_{1/2}$ and 1d$_{5/2}$-1p$_{1/2}$ proton-neutron interactions. It is found that the former changes by 40\% compared with the mirror nucleus $^{16}$N, and the second by 10\%. This apparent symmetry breaking of the nuclear force between mirror nuclei finds explanation in the role of the large coupling to the continuum for the states built on an $\ell=0$ proton configuration.
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I. Stefan, Francois de Oliveira Santos, O. Sorlin, T. Davinson, M. Lewitowicz, et al.. Probing Nuclear forces beyond the drip-line using the mirror nuclei $^{16}$N and $^{16}$F. Physical Review C, American Physical Society, 2014, 90, pp.014307. ⟨10.1103/PhysRevC.90.014307⟩. ⟨in2p3-01005736⟩

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