Abstract
An exclusive coincidence experiment using the reaction on , , and was carried out for the first time by measuring decay protons from the isobaric analog states (IAS). Spreading widths of the IAS are deduced from the escape and total widths. The results show a strong isospin dependence which can be explained by the isospin mixing effect due to the coupling to the component among three multiplets , , and of isovector monopole states in daughter nuclei. Empirical isospin mixing probabilities are found to be consistent with microscopic sum rule predictions.
- Received 21 May 1998
DOI:https://doi.org/10.1103/PhysRevLett.81.3607
©1998 American Physical Society