Low-lying Proton Intruder State in 13B

Ota, S.; Shimoura, S.; Iwasaki, H.; Kurokawa, M.; Michimasa, S.; Aoi, N.; Baba, H.; Demichi, K.; Elekes, Z.; Fukuchi, T.; Gomi, T.; Kanno, S.; Kubono, S.; Kurita, K.; Hasegawa, H.; Ideguchi, E.; Iwasa, N.; Matsuyama, Y. U.; Yurkewicz, K. L.; Minemura, T.; Motobayashi, T.; Murakami, T.; Notani, M.; Odahara, A.; Saito, A.; Sakurai, H.; Takeshita, E.; Takeuchi, S.; Tamaki, M.; Teranishi, T.; Yanagisawa, Y.; Yamada, K.; Ishihara, M.

Low-lying Proton Intruder State in 13B

Authors

Description

The neturon rich nucleus 13B was studied via the proton transfer reaction 4He(12Be,13B γ) at 50AMeV. 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.
16 pages, 3 figures