The neutron-rich nucleus 13B was studied via the proton transfer reaction 4He(12Be, 13Bγ) 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.
|ジャーナル||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|出版ステータス||出版済み - 9 4 2008|
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