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We have calculated the 1+ and 3+, T=0 states in 14N and 10B. In aneutron-proton RPA model these two nuclei are described by the same set ofequations. We first show that a bare Minnesota interaction leads to too weakbinding in bothnuclei. Furthermore it does not produce a 3+ ground state in 10Bas it should. Including medium effects as an exchange of phonons between theneutron-proton pair cures the desagreement in 14N but still gives a 1+ groundstate in 10B with the 3+ as an excited state. The same study with a Gognyeffective interaction reproduces nicely the properties of both nuclei: sameagreement in 14N as previously when medium effeccts were introduced but now the3+ in 10B becomes the ground state. This success suggests that through itsdensity dependent term the Gogny interaction takes account of the presence of athree-body force which, in a shell model calculation, has been shown to beessential to give a 3+ ground state in 10B.

T=0 effective interaction in 14N and 10B