  The presence of large-scale magnetic fields and ultra-relativistic electrons
in the intra-cluster medium (ICM) is confirmed through the detection of diffuse
radio synchrotron sources, so-called radio halos and relics. Due to their
steep-spectrum nature, these sources are rarely detected at frequencies above a
few GHz, especially in low-mass systems. The aim of this study is to discover
and characterise diffuse radio sources in low-mass galaxy clusters in order to
understand their origin and their scaling with host cluster properties. We
searched for cluster-scale radio emission from low-mass galaxy clusters in the
Low Frequency Array (LOFAR) Two-metre Sky Survey - Data Release 2 (LoTSS-DR2)
fields. We made use of existing optical (Abell, DESI, WHL) and X-ray (comPRASS,
MCXC) catalogues. The LoTSS-DR2 data were processed further to improve the
quality of the images that are used to detect and characterize diffuse sources.
We have detected diffuse radio emission in 28 galaxy clusters. The number of
confirmed (candidates) halos and relics are six (seven) and 10 (three),
respectively. Among these, 11 halos and 10 relics, including candidates, are
newly discovered by LOFAR. Beside these, five diffuse sources are detected in
tailed radio galaxies and are probably associated with mergers during the
formation of the host clusters. We are unable to classify other 13 diffuse
sources. We compare our newly detected, diffuse sources to known sources by
placing them on the scaling relation between the radio power and the mass of
the host clusters.
