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Alpha particle production by molecular single-particle effect in reactions of Be just above the Coulomb barrier
The -particle production in the dissociation of Be on
Bi and Zn at energies just above the Coulomb barrier is studied
within the two-center shell model approach. The dissociation of Be on
Bi is caused by a molecular single-particle effect (Landau-Zener
mechanism) before the nuclei reach the Coulomb barrier. Molecular
single-particle effects do not occur at that stage of the collision for
Be+Zn, and this explains the absence of fusion suppression
observed for this system. The polarisation of the energy level of the last
neutron of Be and, therefore the existence of avoided crossings with that
level, depends on the structure of the target.Comment: 5 pages, 4 figure