Planned measurement of particle branching ratios of astrophysically interesting states in Mg-22

In order to measure the particle branching ratios for the decay of states i n Mg-22 of possible astrophysical interest, we are currently constructing a "lampshade" array of silicon strip detectors. They will work in coincidenc e with our Enge magnetic spectrometer and focal plane detector to detect pr oton or alpha decay of particular Mg-22 states. In x-ray bursts, the Ne-18( alpha, p)Na-21 reaction is a pathway from the hot CNO cycle to explosive hy drogen burning. In novae, the rate of Na-21(p, gamma)Mg-22 relative to Na-2 1 beta (+) decay will constrain models when combined with the detection of Na-22 by the next generation of orbiting gamma -detectors. We will extract branching ratios that will yield the resonance strengths that can contribut e to these reaction rates.