A compact array of segmented clover detectors has been used in conjunction
with a high transmission recoil separator. Prompt gamma-rays are detected b
y the array, and the subsequent recoiling nucleus by a position sensitive s
ilicon detector at the separator focal plane. Isomeric gamma-ray transition
s were also detected by germanium detectors at the focal plane. Transitions
from the Er-166(Si-28, 4n)Pb-190 thin-target reaction at 143 MeV were stud
ied. Both prompt and isomeric states were observed associated with spherica
l, oblate and prolate configurations.