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We present a large multi-epoch high resolution spectroscopic investigationfor the search of binary candidates in the Galactic Globular Cluster (GGC) M4.The aim of our work is the identification of the binary candidates, and thedetermination of the binary fraction and of the binary radial distribution. Wepresent a large multi-epoch high resolution spectroscopic investigation for thesearch of binary candidates in the Galactic Globular Cluster (GGC) M4. The aimof our work is the identification of the binary candidates, and thedetermination of the binary fraction and of the binary radial distribution. Theaverage radial velocity of the observed cluster members is$70.29+/-0.07(+/-0.3)(+/-0.1)km/s. The search for variations in radialvelocities among the stars with multi-epoch observations yielded 57 binary starcandidates. Our radial velocity measurement accuracy allowed us to identify ata 3sigma level binaries with radial velocity variations larger than ~0.3km/sfor the target stars with V<15, and larger than ~0.5km/s for the targets withV>15. We identified 4 binary star candidates out of 97 observed targets insidethe core radius, and 53 candidates out of 2372 observed stars outside the coreradius. Accounting for the incompleteness affecting our survey, the lower limitfor the total binary fraction is f=3.0+/-0.3%. The lower limit for the binaryfraction in the cluster core is f=5.1+/-2.3%, while outside the core itdecreases to f=3.0+/-0.4%. Similarly, we found f=4.5+/-0.4% and f=1.8+/-0.6%for the binary fraction inside and outside the half mass radius.

A search for spectroscopic binaries in the galactic globular cluster M4. Based on 5973 individual spectra collected at VLT