S - process production in the central helium burning of large masses ( M ⩾ 15 M⊙ )

Abstract

From these computations one gets some general indications:

• 1) If the hypothesis of the B.P.is true, they may increase the s-process production by a factor of 4 – 5 in the range ofmass number 60 : 70 (in the 15 Me Y = 0.28 and Z = 0.02).

• 2) Theeffect of the newC 12 (a,7)rate is again to slightly increase the production of s-elements in the range of mass number 60 - 70 by a factor of 2 (in the 25 Me Y = 0.25 Z = 0.003).

We are now computing models of different masses and chemical composition to obtain more detailed information on the effect of this new physics on the production of s - elements.