Abstract
The presence of isospin mixing into the ground state of 52 Mn was studied via anisotropic positron emission from nuclei. With this method the isospin forbidden Fermi-component in the Gamow–Teller dominated β decay was determined. It is shown that sample purity and the control of positron scattering is of vital importance. Comparison between theory and experiment shows that shell model calculations of the isospin mixing probability deviate by a factor three to seven from experiment. For more recent Hartree–Fock-RPA based calculations the difference is over two orders of magnitude.
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