GAMMA-RAY STUDIES OF NEUTRON-RICH SDF SHELL NUCLEI PRODUCED IN HEAVY-ION COLLISIONS

Reanalysis of gammagamma coincidence data acquired in studies of superdeformed bands in Hg and Tl nuclei has yielded spectroscopic information about light neutron-rich products of binary reactions of S-34, S-36, and Cl-37 beams on Gd-160 targets. Gates set on known gamma rays in A approximately 160 products selected individual reaction channels and identified coincident gamma rays in A approximately 36 partner products. Transfers of protons from projectile to target and of neutrons from target to projectile were generally favored, leading to excited neutron-rich light nuclei, including some difficult to reach by other means. Notable results include the observation of gamma ray cascades up to the highest known yrast states in four N=20 isotones. In two N=19 nuclei, Si-33 and P-34, and the two N=22 nuclei, 38S and Cl-39, previously unknown yrast states were identified.