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The technique of middle-point matching accompanied by an iterative application of suitable correction formulas for trial values of corresponding parameters is considered in integrating a two-channel Schrodinger equation. In the case of the deuteron wave equations, when tensor forces are taken into account, a correction formula for improving an initial energy value is used in obtaining the binding energy and the corresponding wave functions, the formula giving quadratic convergence. The extension of the method to nucleon-nucleon scattering states is straightforward and the variable quantities are, in that case, the parameters of a phenomenological potential. 1 H. Feshbach and J. Schwinger, Phys. Rev. 84, 194 (1951).

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R. DALITZ Department o/ Theoretical Physics -Ox]ord (Nuovo Gin~ento, 53A, 301 (1968)) In Fig This result has opposite sign to that required for the level shift needed to ensure stability for 6LiA (and a magnitude of about one-third),.Incidentally, if we substitute for eq. (15) a similar but spin-independent chargesymmetry-breaking potential which fits the A----4 value of ABA= (0.56~ 0.1)MeV, we obtain for the level shift needed to ensure stability for aLiA only one-half the magnitude required, but this time in the right direction. Footnote (17) should be adjusted accordingly ~.68" -11 Nuovo Cimento A.