Comment on well matching in distorted-wave-Born-approximation predictions for two-nucleon transfers

The sensitivity of many calculations in the distorted-wave-Born-approximation (DWBA) to optical model parameter ambiguities has led to the introduction of a well-matching condition which was discussed in a recent paper. The claim for the merit of this condition was based primarily on its success and consistent usefulness in standard DWBA calculations. A theoretical argument given for its plausibility is explained in greater detail. It is argued that the absence of restraints on optical model potentials may be expected to lead to poor results with the common DWBA approximations whereas the well-matching condition helps to insure the smallness of some generally neglected terms.