2ND-FORBIDDEN BETA-DECAY AND THE EFFECT OF (V-INTERACTION AND S-INTERACTION ADMIXTURES - CL-36(A))

The shapefactor, the log ft-value, the electron longitudinal polarizat ion and the distribution of electrons emitted from oriented nuclei of Cl-36 have been calculated by applying two different nuclear models. F irstly a pure 1d3/2 --> 1d3/2 transition has been considered. Secondly a more refined shell model of the s-d shell configuration space has b een taken into account. It is shown that there is no great influence o f the shell model version to the observables, that the observables dep end strongly on the relativistic nuclear matrix elements, that the so- called ''two parameter equation'' for the shapefactor cannot be used i n the case of Cl-36 and that there is no larger sensitivity of (V + A) admixtures to the electron longitudinal polarization than normally fo und in allowed decays. Comparisons with the existing experimental data are made.