Abstract
The extremely weak -forbidden magnetic dipole ( ) transition from the ground state of to a state at was investigated by 165° and 180° electron scattering. The extracted strength of represents the smallest value ever measured in electron scattering. A combined analysis with the isospin-analogous Gamow-Teller (GT) decays of the ground states of and is performed. Empirical corrections of Brown and Wildenthal to the magnetic operators reasonably account for the data. Corrections derived from microscopic approaches are less successful pointing towards a fundamental, not yet understood problem in the description of the effective and GT operators.
- Received 15 July 1998
DOI:https://doi.org/10.1103/PhysRevLett.82.291
©1999 American Physical Society