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We study the spectrum of the cosmic X-ray background (CXB) in energy range$\sim$5-100 keV. Early in 2006 the INTEGRAL observatory performed a series offour 30ksec observations with the Earth disk crossing the field of view of theinstruments. The modulation of the aperture flux due to occultation ofextragalactic objects by the Earth disk was used to obtain the spectrum of theCosmic X-ray Background(CXB). Various sources of contamination were evaluated,including compact sources, Galactic Ridge emission, CXB reflection by the Earthatmosphere, cosmic ray induced emission by the Earth atmosphere and the Earthauroral emission. The spectrum of the cosmic X-ray background in the energyband 5-100 keV is obtained. The shape of the spectrum is consistent with thatobtained previously by the HEAO-1 observatory, while the normalization is$\sim$10% higher. This difference in normalization can (at least partly) betraced to the different assumptions on the absolute flux from the Crab Nebulae.  The increase relative to the earlier adopted value of the absolute flux ofthe CXB near the energy of maximum luminosity (20-50 keV) has directimplications for the energy release of supermassive black holes in the Universeand their growth at the epoch of the CXB origin.Comment: A&A, 14 pages, 12 figue

INTEGRAL observations of the cosmic X-ray background in the 5–100 keV range via occultation by the Earth