Dilatational and collective quadrupole excitations of the nucleus ${\mathrm{O}}^{16}$ are treated by the method of generator coordinates described in the preceding paper. In this method, one starts from assumed two-body forces and calculates the stiffness, inertia, and frequency of the collective motion. Numerical results are presented for these quantities.

Experimental data relative to collective 0+ and 2+ states in ${\mathrm{O}}^{16}$ are summarized, and other theoretical treatments of this problem are discussed. It is noted that collective models all imply too large a matrix element for the decay of the 6.06-Mev (0+) state. One concludes that this state is not primarily a dilatational excitation. Similar considerations apply to the 6.91-Mev (2+) state.

• Received 20 June 1957

DOI:https://doi.org/10.1103/PhysRev.108.328