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Within the framework of the SU͑3͒ limit of the neutron-proton interacting boson model the matrix elements of the angular momentum and the quadrupole operator between states belonging to the Kϭ1 band are given in closed forms. To obtain the matrix elements analytically, we first derive the extended U(6)ʛSU(3) isoscalar factors associated with low-lying bands by using the intrinsic SU͑3͒ states. The extended U(6)ʛSU(3) isoscalar factor is defined as the product of the ordinary U(6)ʛSU(3) isoscalar factor and the U͑6͒-reduced matrix element of the one-body boson operator. Using these results, M 1 and E2 intraband transition probabilities and the electromagnetic moments in the Kϭ1 band are derived in closed forms.

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