Neutron halos in the excited states of 12B
Belyaeva, T. L., Goncharov, S. A., Demyanova, A. S., Ogloblin, A. A., Danilov, A. N., Maslov, V. A., . . . Mukhamejanov, E. (2018). Neutron halos in the excited states of 12B. Physical Review C, 98 (3), 034602. doi:10.1103/PhysRevC.98.034602
Published inPhysical Review C
© 2018 American Physical Society
The differential cross sections of the 11B(d,p) 12B reaction leading to formation of the 1+ ground state and the 0.95-MeV 2+, 1.67-MeV 2−, 2.62-MeV 1−, 2.72-MeV 0+, and 3.39-MeV 3− excited states of 12B are measured at Ed = 21.5 MeV. The analysis of the data is carried out within the coupled-reaction-channels method for the direct neutron transfer and the Hauser-Feshbach formalism of the statistical compound-nucleus model. The spectroscopic factors, asymptotic normalization coefficients, and rms radii of the last neutron in all states studied are deduced. The existence of the neutron halos in the 1.67-MeV 2− and 2.62-MeV 1− states is found, consistent with the earlier published data. New information about the enlarged rms radii of the last neutron in the 2.72-MeV 0+ (5.7 fm) and the unbound 3.389-MeV 3− (5.9 fm) states of 12B was obtained, resulting in the possible existence of neutron halo-like states in 12B.