Abstract
A complete theoretical study is carried out of the beta decays of the12B and12N ground states to the12C ground state. We calculated the form factor coefficientsF NKLs (ke, m, n, ρ) using the Cohen-Kurath wave functions. In particular, we obtained reasonable values for the form factor coefficientsA F 0101 andv F 0111 whose ratio contains the influence of the weak magnetism coupling constant. It is shown that in this way the measurements of the shape factors presented by Wu and coworkers can be explained. In addition, it is demonstrated that the contribution of the term proportional to (WR)2 cannot be completely neglected because of the large end point energyW 0. From our value ofv F 0111 we have derived the radiative widthΓ γ (M1) of the isobaric analogγ transition from the excited state12C* to the ground state of12C. The result is in good agreement with the experimental data.
For both beta transitions we have evaluated theft values which are in good agreement with the experimental values. It is confirmed that the difference between theft values for both beta transitions can be accounted for by binding energies effects.
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On leave from the Departamento de Fisica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, as Fellow of the Consejo Nacional de Investigaciones Cientificas y Técnicas of Argentina.
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Behrens, H., Szybisz, L. The decay of theT=1 isospin triplet inA=12 systems. Z Physik A 273, 177–183 (1975). https://doi.org/10.1007/BF01435837
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DOI: https://doi.org/10.1007/BF01435837