Abstract
We have measured a mean life of 392 \ifmmode\pm\else\textpm\fi{} 12 psec for the 4.49-MeV (${5}^{\ensuremath{-}}$) state of $^{40}\mathrm{Ca}$, corresponding to an $E2$ transition strength of 1.04 \ifmmode\pm\else\textpm\fi{} 0.03 Weisskopf units which is considerably stronger than that predicted by a one-particle, one-hole description of the states. However, this $E2$ decay rate and those of eight other $E2$ transitions between odd-parity states can be understood when the states are described as admixtures of deformed and spherical wave functions.
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