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We report on the spectral analysis results of the neutron star, atoll type,low mass X-ray Binary 4U1636-53 observed by INTEGRAL and BeppoSAX satellites.Spectral behavior in three different epochs corresponding to three differentspectral states has been deeply investigated. Two data set spectra show acontinuum well described by one or two soft blackbody plus a Comptonizedcomponents with changes in the Comptonizing electrons and black bodytemperature and the accretion rates, which are typical of the spectraltransitions from high to low state. In one occasion INTEGRAL spectrum shows,for first time in this source, a hard tail dominating the emission above 30keV. The total spectrum is fitted as the sum of a Comptonized component similarto soft state and a power-law component (Gamma=2.76), indicating the presenceof a non thermal electron distribution of velocities. In this case, acomparison with hard tails detected in soft states from neutron stars systemsand some black hole binaries suggests that a similar mechanism could originatethese components in both cases.Comment: 6 pages, 4 figures, 2 tables. accepted Ap

Disk‐Jet Coupling in the Low‐Mass X‐Ray Binary 4U 1636−53 fromINTEGRALObservations