Abstract
The spin-dependent parameters g 0 and g' 0 in Migdal's theory of finite Fermi systems are studied. Assuming their values to be such as to reproduce the M1 states in 208Pb at 7 and 8 MeV, the origin of these (large) values in meson-exchange contributions to the nucleon-nucleon force is studied. Pion exchange contributes little, because of cancellation between matrix elements from the spin-spin and tensor components. The largest, nearly equal, contributions to g 0 and g' 0 come from p-meson exchange. In order to explain the large values needed for g 0 and g' 0, the tensor coupling of the ρ-meson must be substantially larger than the effective ones found in current phenomenological potentials, such as the Reid soft-core and Hamada-Johnston ones. The large value of the coupling needed follows from work analyzing nucleon form factors.
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