Structure of 14B and the evolution of N=9 single-neutron isotones

We have used the B-13(d, p)B-14 reaction in inverse kinematics to study the properties of states in B-14, the lightest particle-bound N = 9 isotone. The spectroscopic information, including spins, parities, and spectroscopic factors for the states observed in B-14 are used to deduce the wave functions for the low-lying negative parity nu(sd) levels, as well as provide information about the evolution of the effective neutron 1s(1/2) - 0d(5/2) single-particle energies. The data confirm that the ground and first-excited states are predominantly s wave in character and are single-neutron halo states. The effective single-particle energies are found to match the trends set by other N = 9 isotones.