New narrow resonances observed in the unbound nucleus ${}^{15}\mathrm{F}$

V. Girard-Alcindor (1, 2) , A. Mercenne , I. Stefan (2) , F. de Oliveira Santos (1) , N. Michel , M. Płoszajczak (1) , M. Assié (2) , A. Lemasson (1) , E. Clément (1) , F. Flavigny (3) , A. Matta (3) , D. Ramos (1) , M. Rejmund (1) , J. Dudouet (4) , D. Ackermann (1) , P. Adsley (2) , M. Assunção , B. Bastin (1) , D. Beaumel (2) , G. Benzoni , R. Borcea , A.J. Boston , L. Cáceres (1) , B. Cederwall , I. Celikovic , V. Chudoba , M. Ciemala , J. Collado , F.C.L. Crespi , G. d'Agata , G. de France (1) , F. Delaunay (3) , C. Diget , C. Domingo-Pardo , J. Eberth , C. Fougères (1) , S. Franchoo (2) , F. Galtarossa , A. Georgiadou , J. Gibelin (3) , S. Giraud (1) , V. González , N. Goyal (2) , A. Gottardo , J. Goupil (1) , S. Grévy (1) , V. Guimaraes , F. Hammache (2) , L.J. Harkness-Brennan , H. Hess , D.S. Judson Oliver , O. Kamalou (1) , A. Kameneyero (1) , J. Kiener (2) , W. Korten (5) , S. Koyama , M. Labiche , L. Lalanne (2) , V. Lapoux (5) , S. Leblond (1) , A. Lefevre (1) , C. Lenain (3) , S. Leoni , H. Li (1) , A. Lopez-Martens (2) , A. Maj , I. Matea (2) , R. Menegazzo , D. Mengoni , A. Meyer (2) , B. Million , B. Monteagudo (3) , P. Morfouace (1) , J. Mrazek , M. Niikura , J. Piot (1) , Zs. Podolyak , C. Portail (2) , A. Pullia , B. Quintana , F. Recchia , P. Reiter , K. Rezynkina (6) , T. Roger (1) , J.S. Rojo , F. Rotaru , M.D. Salsac (5) , A.M. Sánchez Benitez , E. Sanchis , M. Şenyigit , N. de Séréville (2) , M. Siciliano (5) , J. Simpson , D. Sohler , O. Sorlin (1) , M. Stanoiu , C. Stodel (1) , D. Suzuki , C. Theisen (5) , J.C. Thomas (1) , P. Ujic , J.J. Valiente-Dobón , M. Zielińska (5)

1 GANIL - Grand Accélérateur National d'Ions Lourds
2 IJCLab - Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
3 LPCC - Laboratoire de physique corpusculaire de Caen
4 IP2I Lyon - Institut de Physique des 2 Infinis de Lyon
5 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
6 IPHC - Institut Pluridisciplinaire Hubert Curien

The structure of the unbound ${}^{15}\mathrm{F}$ nucleus is investigated using the inverse kinematics resonant scattering of a radioactive ${}^{14}\mathrm{O}$ beam impinging on a ${\mathrm{CH}}_2$ target. The analysis of ${}^1\mathrm{H}({}^{14}\mathrm{O},\mathrm{p}){}^{14}\mathrm{O}$ and ${}^1\mathrm{H}({}^{14}\mathrm{O},2\mathrm{p}){}^{13}\mathrm{N}$ 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 ${}^{14}\mathrm{O}$, and by sequential 2p emission to the ground state of ${}^{13}\mathrm{N}$ via the $1^{-}$ resonance of ${}^{14}\mathrm{O}$. 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 ${}^1\mathrm{H}({}^{14}\mathrm{O},\mathrm{p}){}^{14}\mathrm{O}$ and resonance spectrum in ${}^{15}\mathrm{F}$ are well reproduced in the unified framework of the GSM.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]; Physique Nucléaire Théorique [nucl-th]

V. Girard-Alcindor, A. Mercenne, I. Stefan, F. de Oliveira Santos, N. Michel, et al.. New narrow resonances observed in the unbound nucleus ${}^{15}\mathrm{F}$. Phys.Rev.C, 2022, 105 (5), pp.L051301. ⟨10.1103/PhysRevC.105.L051301⟩. ⟨hal-03472854⟩