Constraints on the spectra of ^17,19C

Diverse means are used to investigate the spectra of the radioactive, exotic ions, ^17,19C. First, estimates have been made using a shell model for the systems. Information from those shell model studies were then used in evaluating cross sections of the scattering of 70 A MeV ^17,19C ions from hydrogen. Complementing those studies, a multichannel algebraic scattering (MCAS) theory for n+^16,18C coupled-channel problems has been used to identify structures of the compound systems. The results show that the shell model structure assumed for these ions is reasonable with little need of effective charges. The conditions that two excited states exist within a few hundred keV of the ground state places some restriction upon the structure models. Other positive parity states are expected in the low-lying spectra of the two nuclei.