We report the results of a high-resolution study of neutron resonances
below 500 eV in Ho-166. We find nine previously unreported weak reson
ances at energies 24.79, 75.08, 119.98, 187.94, 210.86, 227.87, 235.94
, 248.60, and 264.98 eV. Bayesian probability analysis of the widths i
ndicates they are formed primarily by s-wave capture and are therefore
negative-parity resonances. If they have measurable d-wave neutron wi
dths, they are candidates for the fivefold correlation test of time re
versal.