Low-lying proton intruder state in 13B

  title={Low-lying proton intruder state in 13B},
  author={Satoshi Ota and Susumu Shimoura and Hironori Iwasaki and Meiko Kurokawa and Shin'ichiro Michimasa and Nori Aoi and H Baba and K. Demichi and Zolt{\'a}n Elekes and T. Fukuchi and Tomoko Gomi and Shouko Kanno and S. Kubono and Kazuyoshi Kurita and H. Hasegawa and E. Ideguchi and N. Iwasa and Yoshitaka Matsuyama and Katie Yurkewicz and Toshiyuki Minemura and Tohru Motobayashi and Tetsuya Murakami and Masahiro Notani and Atsuko Odahara and Akiko Saito and H. Sakurai and Eri Takeshita and Shoji Takeuchi and M. Tamaki and Takashi Teranishi and Yoshiyuki Yanagisawa and K. N. Yamada and Masayasu Ishihara},
  journal={Physics Letters B},
Abstract The neutron-rich nucleus 13 B was studied via the proton transfer reaction 4 He( 12 Be,  13 B γ ) at 50 A MeV . The known 4.83-MeV excited state was strongly populated and its spin and parity were assigned to 1 / 2 + by comparing the angular differential cross section data with DWBA calculations. This low-lying 1 / 2 + state is interpreted as a proton intruder state and indicates a deformation of the nucleus. 
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