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The J=2-1 and 3-2 rotational lines of the rare isotopomer C36S and the J=5-4and 6-5 transitions of Si36S were detected in the carbon star IRC+10216 (CWLeo). These are the first detections of 36S bearing molecules in a star and thefirst spectroscopic detection of Si36S. From a comparison of 34S and 36Sbearing isotopomers, th 34S/36S isotopic ratio is 107(+-15). This value iscomparable to values in the interstellar medium of the inner Galactic disk(115) but is smaller than the solar value of 288 (Ding et al. 2001). Theincrease of the 36S abundance relative to 34S only qualitatively follows modelpredictions of a low mass AGB star. Quantitative agreement of the observed34S/36S ratio with the stellar models can be reached if the age of IRC+10216and Galactic chemical evolution are taken into account. Other less likelypossibilities are the presence of considerable inhomogeneities in theinterstellar medium and either IRC+10216 or the Sun started with a peculiar 36Sabundance. Other production mechanisms potentially capable of enhancing theGalactic interstellar medium are discussed. From the observed line densitytoward IRC+10216 and toward Galactic star forming regions, we estimate theconfusion limit toward those sources

The abundance of $\mathsf{^{36}}$S in IRC+10216 and its production in the Galaxy