Cabibbo angle and the asymmetry of the 35Ar decay

It is demonstrated that using available experimental data of the β-decay of 35Ar it is possible to obtain a value of the vector coupling constant Gsub(v) which is in excellent agreement with those values obtained from the studies of 0+ → 0+ β-transitions and hyperon β-decays. Taking into account the end-point energy Esub(o) = 4,968.5 +- 3.5 keV together with the recently measured asymmetry parameter of the angular distribution of positrons from polarised nuclei, A = 0.33 +- 0.06, we obtained Gsub(v) = (1.4011 +- 0.0120) x 10-49 erg x cm3. This result yields sin theta sub(v) = 0.218 +- 0.037 which agrees well with the 'normal' Cabibbo angle. Thus this work provides an important contribution in solving the 35Ar 'puzzle'. (orig.)