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In 2002-2004 the COMPASS experiment at the CERN SPS has taken data with a polarised muon beam scattering off a polarised LiD target. The same measurement was also performed in 2006 increasing the statistics by roughly a factor of two. The new results from the 2006 data on the longitudinal double spin asymmetry A1 and on the spin dependent structure function g d 1 are shown and compared to the previous results from the 2002-2004 data. Using the combined data set the first moment of g1 is calculated. This quantity is used to compute the singlet axial charge a0, which in the MS scheme is equal to ∆Σ the total contribution from the quarks to the nucleon spin. Using also the axial charges a3 and a8 the first moments of the quark helicity distributions are obtained.

Final results on the spin dependent structure function g_1^d from COMPASS