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We report the results of the deepest Galactic Plane (|b| < 17.5 deg) surveyin the 67.9 and 78.4 keV nuclear de-excitation lines of titanium-44 (44Ti)performed using the data acquired with the IBIS/ISGRI instrument onboard theINTEGRAL satellite during 12 years of operation. The peak sensitivity of oursurvey reached an unprecedented level of $4.8\times10^{-6}$ erg s$^{-1}$cm$^{-2}$ (3 sigma) that improves the sensitivity of the survey done byCGRO/COMPTEL by a factor of ~5. As a result, constraining upper limits for allsources from the catalog of Galactic supernova remnants (SNRs; Green 2014) arederived. These upper limits can be used to estimate the exposure needed todetect 44Ti emission from any known SNR using existing and prospective X- andgamma-ray telescopes. Among the youngest Galactic SNRs, only Cas A showssignificant 44Ti emission flux in good agreement with the NuSTAR measurements.We did not detect any other sources of titanium emission in the Galactic Planeat significance level higher than 5 sigma confirming previous claims of therarity of such 44Ti-producing SNRs.

Galactic survey of 44Ti sources with the IBIS telescope onboard INTEGRAL