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We present a new detailed multiband study of the merging cluster A3562, inthe core of the Shapley Concentration Supercluster. We analyzed new, lowfrequency radio data performed at 240 MHz, 332 MHz and 610 MHz with the GiantMetrewave Radio Telescope (GMRT). The new GMRT data allowed us to carry out adetailed study of the radio halo at the centre of A3562, as well as of thehead--tail radio galaxy J1333--3141 embedded in it, and of the extendedemission around the peripheral cluster galaxy J1332--3146a. Thanks to thepresent observations we could derive the integrated spectrum of the radio halowith five data points in the frequency range 240 MHz -- 1.4 GHz. Our data showa clear steepening of the total spectrum in this frequency range. Furthermore,by comparing the GMRT 332 MHz image with a previously published VLA 1.4 GHzimage, we produced an image of the halo spectral index distribution. The imageshows a very complex structure, with an average value of$\alpha^{1.4GHz}_{332MHz} \sim 1.5$ and a number of knots steepening up to$\sim 2$. We performed a combined morphological and statistical analysis usingthe radio images and the quantities derived from XMM--Newton and {\it Chandra}observations. We discuss our results in the light of particle re--accelerationprocesses in galaxy clusters. In particular, we outline an overall picture,consistent with the available radio and X-ray data, in which the cluster mergerkinematics, the injection of turbulence and B--amplification induced by themerger between A 3562 and SC 1329--313 are jointly taken into account.

Spectral properties and origin of the radio halo in A3562