Estimating the small-x exponent of the structure function g1NS from the Bjorken sum rule

We present a new estimate of the exponent governing the small-x behavior of the nonsinglet structure function g1p−n derived under the assumption that the Bjorken sum rule is valid. We use the world wide average of αs and the NNNLO QCD corrections to the Bjorken sum rule. The structure function g1NS is found to be clearly divergent for small x.