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The yrast superdeformed band in 61 Zn has been established using 28 Si( 36 Ar, 2pn) 61 Zn and 40 Ca( 29 Si, 2␣) 61 Zn fusion-evaporation reactions. The excitation energy of this band was determined via two transitions that link this band to the normally deformed states. Lifetime analysis of this band resulted in a quadrupole moment of Q t ϭ3.0Ϯ 0.4 0.5 e b, which corresponds to a deformation of ␤ 2 ϭ0.50Ϯ 0.06 0.07 . A comparison of the J (2) dynamical moments of inertia of the yrast superdeformed band in 61 Zn with those in 60 Zn shows a nearly complete blocking of the observed alignment in 60 Zn, indicating that Tϭ0 proton-neutron pair correlations may be present in 60 Zn. ͓S0556-2813͑99͒51109-6͔

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