High-Spin States in ^203Rn

The high-spin structure of ^203Rn has been investigated using two reactions. Gamma-gamma coincidences were measured for the ^174Yb(^34S,5n) reaction at 167 MeV using the YRAST Ball array at WNSL, Yale University. The ^168Er(^40Ar,5n) reaction at an energy of 188 MeV was also measured, at the Argonne National Laboratory. Here gamma-rays and conversion electrons were observed using the Gammasphere and ICE Ball arrays in coincidence with the FMA. Using these data, the level scheme of ^203Rn has been extended to higher spins and excitation energies. The high-spin decay is dominated by two sequences of gamma rays. The first, probably based on the νi_13/2 orbital, dominates at lower spins. The nature of the second sequence is currently unclear. Data analysis is continuing and results will be reported. This work was supported by the US DOE under grants DE-FG02-91ER-40609 and DE-FG02-88ER-40417.