Abstract
With Wigner's SU(4) supermultiplet symmetry [and its generalization to pseudo-SU(4)] as a starting point, a boson-model space is constructed that includes $T=0$ as well as $T=1$ bosons (interacting boson model-4). The boson Hamiltonian is derived microscopically from a realistic shell-model interaction through a mapping that relies on the existence of approximate shell-model symmetries. Applications are presented for odd-odd $N=Z$ nuclei from ${}_{29}^{58}{\mathrm{Cu}}_{29}$ to ${}_{35}^{70}{\mathrm{Br}}_{35}.$
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