Isospin mixing in the $2^{+}$, $1^{+}$, and $3^{+}$ states of ${\mathrm{Be}}^8$ has been calculated with correlated radial wave functions obtained from reference-spectrum solutions of the Bethe-Gold-stone equation. The off-diagonal matrix elements are approximately a factor of 2 larger than those calculated with oscillator wave functions and provide a very reasonable interpretation of the experimental data.

• Received 1 March 1971

DOI:https://doi.org/10.1103/PhysRevLett.26.978