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

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 A d 1 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 g d 1 is calculated. This quantity is used to compute the singlet axial charge a 0 , which in the MS scheme is equal to DS the total contribution from the quarks to the nucleon spin. Using also the axial charges a 3 and a 8 the first moments of the quark helicity distributions are obtained.