Cluster Structure in Be Isotopes within Point-Coupling Covariant Density Functional.

The potential energy surfaces and density distributions of ground states in even-mass Be isotopes are studied by using the point-coupling covariant density functional theory with the PC-F1 effective interaction. The clustering structure is exhibited automatically in most of the Be isotopes. The results indicate that 6Be has an a+2p clustering structure, while 8,10,14 Be have the 2a clustering structure. The a-a distances and the corresponding quadrupole deformation parameters have a similar evolution trend against the neutron number. [ABSTRACT FROM AUTHOR]