Bounds On Elements of the S Matrix for Elastic Scattering One Dimensional Scatt
Bounds On Elements of the S Matrix for Elastic Scattering One Dimensional Scatt
Ralph Bartram
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*A, phase shift 5 . {\i) corresponding to the comparison potential is obtained when X = 1, and 5. (^) when X = 0. It follows from Eq. (39) that 5 . (^) is an upper bound on 6. (n), 8^i(n) ^ 6. (^). (ho). As before, we are required to keep track of the eigenphases as X is varied continuously from zero to one. The only difficulty occurs at a possible crossing point, but B. (|a, X) = 5. (|a, X) already implies that these eigen- 19 phase shifts axe greater than the true values and they can only inc...rease as X approaches one. Eq. (^O) is therefore valid in any case. By introducing another comparison potential such that A V is non- negative^ it can be shown in a similar fashion that the corresponding eigenphase shifts 6 (|a) are lower boimds on the 5. ((i)^ B^. (u) § 5. (^) . (J+1) The way in which the bounding curves obtained from the comparison potentials can be used to calculate lower bounds a and p on a and on p, respectively, is illustrated for a typical case in Figure 2. It y is clear from Figure 2 that if the comparison potentials do not approxi- mate the actual potential fairly closely, it may not be possible to ob- tain lower bounds on a and on p .
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