An Anomaly in the Use of Perturbation Theory
Nuclear Science and Engineering / Volume 78 / Number 4 / August 1981 / Pages 393-395
Technical Note / dx.doi.org/10.13182/NSE81-A21373
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It is shown that the classic first-order perturbation formula gives an incorrect result for the first-order eigenvalue change when applied to the internal interface perturbation problem. The correct first-order perturbation formula is obtained.
