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Aims. We present the first results of an ongoing project devoted to thesearch of giant radio halos in galaxy clusters located in the redshift rangez=0.2--0.4. One of the main goals of our study is to measure the fraction ofmassive galaxy clusters in this redshift interval hosting a radio halo, and toconstrain the expectations of the particle re--acceleration model for theorigin of non--thermal radio emission in galaxy clusters. Methods. We selected27 REFLEX clusters and here we present Giant Metrewave Radio Telescope (GMRT)observations at 610 MHz for 11 of them. The sensitivity (1$\sigma$) in ourimages is in the range 35--100~$\mu$Jy beam$^{-1}$ for all clusters. Results.We found three new radio halos, doubling the number of halos known in theselected sample. In particular, giant radio halos were found in A 209 and RXCJ2003.5--2323, and one halo (of smaller size) was found in RXCJ 1314.4--2515.Candidate extended emission on smaller scale was found around the centralgalaxy in A 3444 which deserves further investigation. Furthermore, a radiorelic was found in A 521, and two relics were found in RXCJ 1314.5--2515. Theremaining six clusters observed do not host extended emission of any kind.Comment: 18 pages, 10 figures & appendix. Accepted by A&

GMRT radio halo survey in galaxy clusters atz= 0.2–0.4