Isospin corrections to super-allowed beta decays in nuclei

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Abstract

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.

Original languageEnglish
Article number012001
JournalJournal of Physics: Conference Series
Volume533
Issue number1
DOIs
StatePublished - 2014
Event20th International School on Nuclear Physics, Neutron Physics and Applications, Varna 2013 - Varna, Bulgaria
Duration: 16 Sep 201322 Sep 2013

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