Separation of the Final States of the Residual Nucleus in the Pickup ReactionC12(p, d)C11at 154 Mev

The deuteron groups corresponding to different states of ${\mathrm{C}}^{11}$ in the ($p, d$) reaction on ${\mathrm{C}}^{12}$ at 154 Mev have been separated with a magnetic analyzer. A comparison with the known levels of ${\mathrm{C}}^{11}$ shows that only the $\frac{3}{2}-$ and ½- states (prominently the $\frac{3}{2}-$ ground state) seem to be formed to an appreciable extent. These results can be explained by the fact that at this energy the pickup of a more loosely bound high-momentum $p$-shell neutron should be the most probable; the observed states of ${\mathrm{C}}^{11}$ would then correspond mainly to a hole created in the $p$ shell of ${\mathrm{C}}^{12}$ in its ground state. This gives the possibility in high-energy pickup reactions of exciting selectively certain states of the residual nucleus.