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Nuclear Physics B
A new orientifold of Type-IIB theory on K3 is constructed that has N=1 supersymmetry in six dimensions. The orientifold symmetry consists of a Z_2 involution of K3 combined with orientation-reversal on the worldsheet. The closed-string sector in the resulting theory contains nine tensor multiplets and twelve neutral hypermultiplets in addition to the gravity multiplet, and is anomaly-free by itself. The open-string sector contains only 5-branes and gives rise to maximal gauge groups SO(16) ordoi:10.1016/0550-3213(96)00199-x fatcat:wm25fawqpfeuteujrpwcoxkst4