Low-lying Proton Intruder State in 13B
S. Ota, S. Shimoura, H. Iwasaki, M. Kurokawa, S. Michimasa, N. Aoi, H., Baba, K. Demichi, Z. Elekes, T. Fukuchi, T. Gomi, S. Kanno, S. Kubono, K., Kurita, H. Hasegawa, E. Ideguchi, N. Iwasa, Y.U. Matsuyama, K.L. Yurkewicz,, T. Minemura, T. Motobayashi, T. Murakami, M. Notani
TL;DR
This study investigates the low-lying 1/2+ proton intruder state in 13B using proton transfer reactions, revealing a deformed nucleus and providing new insights into its structure.
Contribution
It reports the first identification of a low-lying proton intruder state in 13B through experimental proton transfer reactions and DWBA analysis.
Findings
Identification of a 4.83-MeV 1/2+ state in 13B
Evidence of nuclear deformation in 13B
Confirmation of the proton intruder state nature
Abstract
The neturon rich nucleus 13B was studied via the proton transfer reaction 4He(12Be,13B \gamma) 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.
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