= One-pion exchange
Although the <pion> has <spin> zero, <one-pion exchange> depends on <nucleon> <spin> and <isospin> and includes a <nuclear tensor force>. Shorter-range and multiple-<nucleon> interactions also matter. The scalar <Yukawa potential> isolates a range mechanism rather than specifying the complete <nuclear force>.<Modern Theory of Nuclear Forces by Evgeny Epelbaum and others>[Modern Theory of Nuclear Forces, inspected preprint sections I.B and II.B, especially equation (2.11) and Fig. 12]{ref}
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