Isospin corrections to the super-allowed beta decay matrix elements are evaluated in perturbation theory using the notion of the giant isovector monopole state. The calculation avoids the separation into different contributions and therefore presents a consistent, systematic and more transparent approach. Explicit expressions for δcas a function of the mass number A are derived. These corrections affect the values of the Vudmatrix element in the Cabbibo-Maskawa-Kobayashi matrix. Also, it is pointed out that in some nuclei with a low number of excess neutrons (protons) Coulomb mixing with the anti-analog state can introduce significant isospin impurities in the isobaric analog state.
|Journal||Journal of Physics: Conference Series|
|State||Published - 2014|
|Event||20th International School on Nuclear Physics, Neutron Physics and Applications, Varna 2013 - Varna, Bulgaria|
Duration: 16 Sep 2013 → 22 Sep 2013