SPECTROSCOPIC-FACTOR RATIOS FOR STATES OF SAME I-PI FROM (D,P) REACTIONS AT DIFFERENT ENERGIES

In a previous study, ratios of spectroscopic factors from (d,p) reactions for l=4 transitions to various 72+ states were found to vary strongly with bombarding energy in the Pd isotopes. As this represents a breakdown in basic one-nucleon-transfer theory, the possibility that this breakdown extends to l=0 and l=2 transitions was investigated in these isotopes. Measurements of ratios of spectroscopic factors for various transitions were made at 8-, 12-, and 17-MeV bombarding energies. The results at the three energies agree within experimental error, which indicates that the theory does not break down for these transitions. Differences in angular distributions for transitions with the same (n,l,j) to different nuclear states were noted in three cases. There is evidence that the ratio of cross sections for d52 and d32 excitations may vary much more between 8 and 12 MeV than is predicted by distorted-wave Born-approximation calculations. © 1969 The American Physical Society.