The neutron-shell structure of 25F was studied using quasi-free (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 for the ground-state to ground-state transition (25F, 24Og.s.) is only 0.36±0.13, and 24O excited states are produced from the 0d5/2 proton knockout. The result shows that the 24O core of 25F nucleus significantly differs from a free 24O nucleus, and the core consists of 35% 24Og.s. and 65% excited 24O.
@article{arxiv.1810.10113,
title = {How different is the core of $^{25}$F from $^{24}$O$_{g.s.}$?},
author = {T. L. Tang and T. Uesaka and S. Kawase and D. Beaumel and M. Dozono and T. Fujii and N. Fukuda and T. Fukunaga and A. Galindo-Uribarri and S. H. Hwang and N. Inabe and D. Kameda and T. Kawahara and W. Kim and K. Kisamori and M. Kobayashi and T. Kubo and Y. Kubota and K. Kusaka and C. S. Lee and Y. Maeda and H. Matsubara and S. Michimasa and H. Miya and T. Noro and A. Obertelli and K. Ogata and S. Ota and E. Padilla-Rodal and S. Sakaguchi and H. Sakai and M. Sasano and S. Shimoura and S. S. Stepanyan and H. Suzuki and M. Takaki and H. Takeda and H. Tokieda and T. Wakasa and T. Wakui and K. Yako and Y. Yanagisawa and J. Yasuda and R. Yokoyama and K. Yoshida and K. Yoshida and J. Zenihiro},
journal= {arXiv preprint arXiv:1810.10113},
year = {2020}
}