  We present the results of a wide-field survey for H-alpha emitting galaxies
in the cluster AC114 at z=0.32. Spectra centred on H-alpha at the cluster
redshift have been obtained for 586 galaxies to I~22 out to a radius around
2Mpc. At most, only ~10% of these were found to be H-alpha-emitting cluster
members. These objects are predominantly blue and of late-type spiral
morphology, consistent with them hosting star formation. However, ~65% of the
cluster members classified morphologically as spirals (with HST), have no
detectable H-alpha emission; star-formation and morphological evolution in
cluster galaxies appear to be largely decoupled. Changes in the H-alpha
detection rate and the strength of H-alpha emission with environment are found
to be weak within the region studied. Star formation within the cluster members
is also found to be strongly and uniformly suppressed, with the rates inferred
from the H-alpha emission not exceeding 4Mo/yr, and AC114's H-alpha luminosity
function being an order of magnitude below that observed for field galaxies at
the same redshift. None of the galaxies detected have the high star formation
rates associated with `starburst' galaxies; however, this may still be
reconciliable with the known (8+/-3%) fraction of `post-starburst' galaxies
within AC114, given the poorly determined but short lifetimes of starbursts and
the possibility that much of the associated star formation is obscured by dust.
