Speaker
Mr
Shinsuke Ota
(Center for Nuclear Study, University of Tokyo)
Description
We have measured the proton transfer reaction of $^{4}$He($^{12}$Be,$^{13}$B$\gamma$) with ``Gamma-Ray detector Array
with Position and Energy sensitivity (CNS-GRAPE)'' in RIKEN.
Analyzing the angular differential cross section, we assigned the $J^{\pi}$ of 4.83~MeV excited state to be $1/2{+}$ with $C^{2}S=0.2$, for the first time.
This state is interpreted as a proton intruder state from the $sd$ shell.
A shell model calculation with an interaction including the effect of the tensor force cannot represent this state, while the deformation explains its low excitation nergy and spectroscopic factor. The observed proton intruder state shows the change of the proton shell structure and indicates the importance of the deformation.
Primary author
Mr
Shinsuke Ota
(Center for Nuclear Study, University of Tokyo)
Co-authors
Dr
Akito Saito
(Department of Physics, University of Tokyo)
Prof.
Atsuko Odahara
(Department of Physics, Osaka University)
Prof.
Eiji Ideguchi
(Center for Nuclear Study, University of Tokyo)
Dr
Eri Takeshita
(RIKEN Nishina Center for Accelerator-Based Science)
Dr
Hidetada Baba
(RIKEN Nishina Center for Accelerator-Based Science)
Mr
Hirokazu Hasegawa
(Department of Physics, Rikkyo University)
Dr
Hironori Iwasaki
(Department of Physics, University of Tokyo)
Prof.
Hiroyoshi Sakurai
(RIKEN Nishina Center for Accelerator-Based Science)
Dr
Kathleen Yurkewicz
(NSCL, Michigan State University)
Dr
Kazunari Yamada
(RIKEN Nishina Center for Accelerator-Based Science)
Prof.
Kazuyoshi Kurita
(Department of Physics, Rikkyo University)
Mr
Kimihiko Demichi
(Department of Physics, Rikkyo University)
Dr
Masahiro Notani
(Argonne National Laboratory)
Prof.
Masayasu Ishihara
(RIKEN Nishina Center for Accelerator-Based Science)
Dr
Meiko Kurokawa
(RIKEN Nishina Center for Accelerator-Based Science)
Mr
Mitsuru Tamaki
(Center for Nuclear Study, University of Tokyo)
Prof.
Naohito Iwasa
(Department of Physics, Tohoku University)
Dr
Nori Aoi
(RIKEN Nishina Center for Accelerator-Based Science)
Dr
Satoshi Takeuchi
(RIKEN Nishina Center for Accelerator-Based Science)
Prof.
Shigeru Kubono
(Center for Nuclear Study, University of Tokyo)
Dr
Shin'ichiro Michimasa
(Center for Nuclear Study, University of Tokyo)
Dr
Shoko Kanno
(RIKEN Nishina Center for Accelerator-Based Science)
Prof.
Susumu Shimoura
(Center for Nuclear Study, University of Tokyo)
Prof.
Takashi Teranishi
(Department of Physics, Kyushu University)
Prof.
Tetsuya Murakami
(Department of Physics, Kyoto University)
Prof.
Tohru Motobayashi
(RIKEN Nishina Center for Accelerator-Based Science)
Dr
Tomoko Gomi
(RIKEN Nishina Center for Accelerator-Based Science)
Dr
Tomonori Fukuchi
(RIKEN Nishina Center for Accelerator-Based Science)
Dr
Toshiyuki Minemura
(RIKEN Nishina Center for Accelerator-Based Science)
Dr
Yoshiyuki Yanagisawa
(RIKEN Nishina Center for Accelerator-Based Science)
Mr
Yuuichi Matsuyama
(Department of Physics, Rikkyo University)
Dr
Zoltan Elekes
(Hugarian Acad. Schi., Inst. Nucl. Res.)
