EXACT AND APPROXIMATE ANGULAR MOMENTUM PROJECTION FOR LIGHT NUCLEI .2.

The Peierls-Yoccoz angular momentum projection method is applied to axially symmetric Hartree-Fock wave functions for several sd-shell nuclei. Excitation energies, rms radii and B(E2; 2+ → 0+) values are calculated and compared with the results of two different approximation methods. This is also done for some 12C wave functions considered earlier. A discussion of the accuracy of these approximations is given. An approximate formula for the B(E2; 2+ → 0+) value is presented, which gives much better agreement with the exact angular momentum projection results than the formula from the Bohr-Mottelson model. © 1969.