How Different is the Core of $^{25}$F from $^{24}$O$_{g.s.}$?

T.L. Tang , T. Uesaka , S. Kawase , D. Beaumel (1) , M. Dozono , T. Fujii , N. Fukuda , T. Fukunaga , A. Galindo-Uribarri , S.H. Hwang , N. Inabe , D. Kameda , T. Kawahara , W. Kim , K. Kisamori , M. Kobayashi , T. Kubo , Y. Kubota , K. Kusaka , C.S. Lee , Y. Maeda , H. Matsubara , S. Michimasa , H. Miya , T. Noro , A. Obertelli (2) , K. Ogata , S. Ota , E. Padilla-Rodal , S. Sakaguchi , H. Sakai , M. Sasano , S. Shimoura , S.S. Stepanyan , H. Suzuki , M. Takaki , H. Takeda , H. Tokieda , T. Wakasa , T. Wakui , K. Yako , Y. Yanagisawa , J. Yasuda , R. Yokoyama , K. Yoshida , J. Zenihiro

1 IPNO - Institut de Physique Nucléaire d'Orsay
2 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers

The structure of a neutron-rich F25 nucleus is investigated by a quasifree (p,2p) knockout reaction at 270A  MeV in inverse kinematics. The sum of spectroscopic factors of π0d5/2 orbital is found to be 1.0±0.3. However, the spectroscopic factor with residual O24 nucleus being in the ground state is found to be only 0.36±0.13, while those in the excited state is 0.65±0.25. The result shows that the O24 core of F25 nucleus significantly differs from a free O24 nucleus, and the core consists of ∼35% O24g.s.. and ∼65% excited O24. The result may infer that the addition of the 0d5/2 proton considerably changes neutron structure in F25 from that in O24, which could be a possible mechanism responsible for the oxygen dripline anomaly.

Mots clés: Nuclear Physics

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

T.L. Tang, T. Uesaka, S. Kawase, D. Beaumel, M. Dozono, et al.. How Different is the Core of $^{25}$F from $^{24}$O$_{g.s.}$?. Physical Review Letters, 2020, 124 (21), pp.212502. ⟨10.1103/PhysRevLett.124.212502⟩. ⟨hal-01921650⟩