Sunyaev Zel'dovich observations of a statistically complete sample of
  galaxy clusters with OCRA-p
  We present 30 GHz Sunyaev Zel'dovich observations of a statistically complete
sample of galaxy clusters with OCRA-p. The clusters are the 18 most X-ray
luminous clusters at z > 0.2 in the ROSAT Brightest Cluster Sample. We correct
for contaminant radio sources via supplementary observations with the Green
Bank Telescope, also at 30 GHz, and remove a cluster that is contaminated by an
unresolved X-ray source. All 17 remaining clusters have central SZ effects with
Comptonisation parameter y_0 exceeding 1.9x10^-4, and 13 are detected at
significance > 3 sigma. We use our data to examine scalings between y_0 and
X-ray temperature, X-ray luminosity, and the X-ray mass proxy Y_X, and find
good agreement with predictions from self-similar models of cluster formation,
with an intrinsic scatter in y_0 of about 25%. We also comment on the success
of the observations in the face of the contaminant source population, and the
implications for upcoming cm-wave surveys.
