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The 12th International Conference on Nucleus-Nucleus Collisions, June 21-26, 2015, Catania, Italy
Cluster rotational bands in 11B
A. Danilov1, A. Demyanova1, A. Ogloblin1, T. Belyaeva2, S. Goncharov3, W. Trzaska4
1 National Research Center “Kurchatov Institute”, Moscow, 123182, Russia
2 Universidad Autonoma del Estado de Mexico, Toluca, 50000, Mexico
3 Lomonosov Moscow State University,Moscow, 119991, Russia
4 The Accelerator Laboratory of the Department of Physics of the University of Jyväskylä, Jyvaskula, Finland
Differential cross-sections of the 11В + α inelastic scattering at Е(α) = 65 MeV leading to the most of the known 11В states at the excitation energies up to 14 MeV were measured [1]. The data analysis was done by DWBA and in some cases by the Modified Diffraction Model [2] allowing determining the radii of the excited states. The radii of the states with excitation energies less than ~ 7 MeV with the accuracy not less than 0.1-0.15 fm coincide with the radius of the ground state. This result is consistent with the traditional view of the shell structure of the low-lying states in 11B. Most of the observed high-energy excited states are distributed among four rotational bands:
К = 3/2-: 8.56 (3/2-) – 10.34 (5/2-) – 11.60 – 13.14 (9/2-) MeV,
К = 1/2+: 6.79 (1/2+) – 9.88 (3/2+) – 11.60 (5/2+) – 13.16 (7/2+) MeV,
K = 3/2+: 7.98 (3/2+) – 9.27 (5/2+) – 10.60 (7/2+) – 12.63 (9/2+) MeV,
K = 5/2+: 7.29 (5/2+) – 9.19 (7/2+) – 11.27 (9/2+) MeV.
Fig. 1. Predicted [3,4] rotational bands in 11B at excitation energies higher 7 MeV. For comparison, rotational band [5], based on the Hoyle state (0+2. 7.65 MeV) of 12C, is shown.
The moments of inertia of band states are close to the moment of inertia of the Hoyle state of 12C. The determined radii, related to these bands, are 0.7 - 1.0 fm larger than the radius of the ground state, and are close to the radius of the Hoyle state. These results are in agreement with existing predictions about various cluster structure of 11B at high excitation energies.
[1] A.N. Danilov, A.S. Demyanova et al., Physics of Atomic Nuclei, in print
[2] A.N. Danilov et al., Phys.Rev. C 80, 054603 (2009)
[3] T. Suhara and Y. Kanada-En'yo, Phys. Rev. C 85, 054320 (2012)
[4] H. Yamaguchi et al., Phys. Rev. C 83, 034306 (2011)
[5] A.A. Ogloblin et al., EPJ Web of Conferences, 66, 02074 (2014)
