Abstract
A 2 pi -exchange (TPE) potential for pseudovector coupling of pions and nucleons is derived by transforming the Dirac equation into a Schrodinger-like form. The resulting TPE potential is spin dependent and attractive in all states of the NN and NN systems and describes part of the intermediate-range interaction. A comparison is made with the Hamada-Johnston potential and with the TPE potential obtained from different approaches.
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