Asymptotic normalization coefficients and halo radii of 12B in the excited states
1 Universidad Autónoma del Estado de México, C. P. 50000, Toluca, México
2 Lomonosov Moscow State University, GSP-1, Leninskie Gory, Moscow 119991, Russia
3 NRC Kurchatov Institute, Moscow RU-123182, Russia
4 Flerov Laboratory for Nuclear Research, JINR, 141980, Dubna, Moscow region, Russia
5 Department of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, P.O. Box 35, Finland
6 V. G. Khlopin Radium Institute, 194021, St. Petersburg, Russia
7 Institute of Nuclear Physics, National Nuclear Center of Republic of Kazakhstan, Almaty, 050032, Republic of Kazakhstan
8 al-Farabi Kazakh National university, Almaty, 050040, Republic of Kazakhstan
Published online: 30 December 2017
We present the results of measurements and analysis of the differential cross sections of the 11B(d, p)12B reaction leading to formation of the 1+ ground state and the 0.953-MeV 2+, 1.674-MeV 2−, 2.621-MeV 1−, 2.723-MeV 0+, 3.389-MeV 3− excited states of 12B at Ed = 21.5 MeV. The analysis of the data was carried out within the coupled-reaction-channels method for the direct neutron transfer and the Hauser-Feshbach formalism of the statistical compound-nucleus model. We deduced the spectroscopic factors, asymptotic normalization coefficients, and rms radii of the last neutron in all states studied. The existence of the neutron halos in the 1.674-MeV 2− and 2.621-MeV 1− states was found in consistence with the earlier published data. New information about the enlarged rms radii (6.5 fm) of the last neutron in the unbound 3.389-MeV 3− states of 12B was obtained, which may indicate the evidence of the neutron halo with the orbital momentum of the last neutron equal to two.
© The Authors, published by EDP Sciences, 2017
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