Three-body model calculations for the 16C nucleus

We apply a three-body model consisting of two valence neutrons and the core nucleus C-14 in order to investigate the ground state properties and electric quadrupole transition of the C-16 nucleus. The discretized continuum spectrum within a large box is taken into account by using a single-particle basis obtained from a Woods-Saxon potential. The calculated B(E2) value from the first 2(+) state to the ground state shows good agreement with the observed data with the core polarization charge which reproduces the experimental B(E2) value for C-15. We also show that the present calculation accounts well for the longitudinal momentum distribution of the C-15 fragment from the breakup of the C-16 nucleus. We point out that the dominant (d(5/2))(2) configuration in the ground state of C-16 plays a crucial role in these agreements.