  Populating states in 22Mg via the (p,t) reaction in inverse kinematics with a
55 MeV/nucleon 24Mg beam, we have measured the proton-decay branching ratios of
the levels at 5.96 MeV and 6.05 MeV and obtained an experimental upper limit on
the branching ratio of the 5.71 MeV state. On the basis of the present and
previous measurements, we assign spins and parities to the 5.96 MeV and 6.05
MeV states. We combine our branching ratios with independent measurements of
the lifetimes of these states or their 22Ne analogs to compute the resonance
strengths and thereby the astrophysical rate of the 21Na(p,g)22Mg reaction. We
perform hydrodynamic calculations of nova outbursts with this new rate and
analyze its impact on 22Na yields.
