Speaker
Mr
Tsz Leung Tang
(RCNP)
Description
The spectra of proton separation energy of $^{23,25}$F were measured by (p,2p) quasi-free scattering. The spectroscopic factors (SF) of the proton bounded states were deduced by comparing with a DWIA calculation. We found that SF the 1d$_{5/2}$ proton of $^{23}$F and $^{25}$F are 0.4 ± 0.1 and 0.9 ± 0.2 respectively. The deformation of $^{23}$F nucleus may be the reason for the reduction. The result of $^{25}$F can be understood as a result of the double magic of $^{24}$O.
We have demonstrated a (p,2p) knockout reaction for probing the bounded states on neutron rich nucleus $^{23}$F and $^{25}$F. The $^{23,25}$F were produced by BigRIPS in RIKEN
Nishina Center, Radioactive Isotope Beam Facility at 289A MeV and 277A MeV respectively. The proton separation energy was extracted by reconstructing the missing 4-momentum of oxygen residue by detecting the scattered protons. We managed to decompose the energy spectrum by selecting different oxygen isotopes, which were results of multi-neutrons emission of highly excited oxygen residue.
The reason for small sum of spectroscopic factors for the s-d shell proton of $^{23}$F is not clear. The overall effect from the nuclear structure and reaction mechanism due
to deformation is still unknown. In contrast, the sum of spectroscopic factors of the s-d shell proton of $^{25}$F is closed to unit and indicates that it is a single particle orbit.
The agreement of the reduction factor in the trend of the $R_{S}−\Delta S$ plot could be due to limitation of 1-neutron threshold. Also, the large reduction factor for the p-shell in both $^{23}$F and $^{25}$F shows that the trend depends on analysis method.
Primary author
Mr
Tsz Leung Tang
(RCNP)
Co-authors
Dr
Alexandre Obertelli
(CEA Orsay)
Dr
Alfredo Galindo-Uribarri
(Oak Ridge National Laboratory)
Mr
CheongSoo Lee
(Center of Nuclear Study, University of Tokyo)
Dr
Daisuke Kameda
(RIKEN Nishina Center)
Dr
Didier Ｂeaumel
(Institut de physique nucleaire d Orsay)
Prof.
Elizabeth Padilla-Rodal
(Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México)
Dr
Hideyuki Sakai
(RIKEN Nishina Center)
Dr
Hiroaki Matsubara
(RIKEN Nishina Center)
Dr
Hiroshi Tokieda
(Center of Nuclear Study, University of Tokyo)
Dr
Hiroyuki Miya
(Center of Nuclear Study, University of Tokyo)
Dr
Hiroyuki Suzuki
(RIKEN Nishina Center)
Dr
Hiroyuki Takeda
(RIKEN Nishina Center)
Dr
Jumpei Yasuda
(Kyushu University)
Dr
Juzo Zenihiro
(RIKEN Nishina Center)
Dr
Keiichi Kisamori
(Center of Nuclear Study, University of Tokyo)
Dr
Kensuke Kusaka
(RIKEN Nishina Center)
Prof.
Kentaro Yako
(Center of Nuclear Study, University of Tokyo)
Dr
Koichi Yoshida
(RIKEN Nishina Center)
Dr
Masaki Sasano
(RIKEN Nishina Center)
Dr
Masanori Dozono
(RIKEN Nishina Center)
Dr
Motoki Kobayashi
(Center of Nuclear Study, University of Tokyo)
Dr
Motonobu Takaki
(Center of Nuclear Study, University of Tokyo)
Dr
Naohito Inabe
(RIKEN Nishina Center)
Dr
Naoki Fukuda
(RIKEN Nishina Center)
Dr
Rin Yokoyama
(Center of Nuclear Study, University of Tokyo)
Dr
Samvel Stepanyan
(Kyungpook National University)
Dr
SanHoon Hwang
(Kyungpook National University)
Dr
Satoshi Sakaguchi
(Kyushu University)
Dr
Shi'ichiro Michimasa
(Center of Nuclear Study, University of Tokyo)
Prof.
Shinsuke Ota
(Center of Nuclear Study, University of Tokyo)
Mr
Shoichiro Kawase
(Center of Nuclear Study, University of Tokyo)
Prof.
Susumu Shimoura
(Center of Nuclear Study, University of Tokyo)
Dr
Takashi Wakui
(CYRIC, Tohoku University)
Mr
Tako Fukunaga
(Kyushu University)
Prof.
Tetsuo Noro
(Kyushu University)
Dr
Tomohiro Uesaka
(RIKEN Nishina Center)
Dr
Tomomi Kawahara
(Toho University)
Dr
Tomotsugu Wakasa
(Kyushu University)
Dr
Toshihiko Fujii
(Center of Nuclear Study, University of Tokyo)
Dr
Toshiyuki Kubo
(RIKEN Nishina Center)
Dr
WooYoung Kim
(Kyungpook National University)
Dr
Yoshiyuki Yanagisawa
(RIKEN Nishina Center)
Dr
Yuki Kubata
(Center of Nuclear Study, University of Tokyo)
Dr
Yukie Maeda
(University of Miyazaki)
