Inelastic proton scattering on 16C

The 2+1 state in neutron rich 16C was studied via inelastic proton scattering in inverse kinematics, using a 33 MeV/nucleon beam. The deformation parameter βpp' = 0.47(5) obtained is greater than the deformation parameter deduced from the lifetime measurement. Combining these two results, the ratio of the neutron and proton quadrupole matrix elements is deduced to be approximately 7, indicating a neutron-dominant quadrupole collectivity in 16C.