Large-scale shell model calculations were carried out for N \sim Z Ga--As nuclei with isospin invariant pairing plus QQ interaction. A particle alignment mechanism was investigated by focusing on the role of the g9/2 orbital. The proton--neutron pairing with isospin zero and angular momentum 9 was found to play an important role in these N \sim Z nuclei.
PACS numbers: 21.10.--k, 21.60.Cs, 21.10.Hw, 21.10.Re
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