Stability of {sup 100}{sub 50}Sn{sub 50} deduced from excited states in {sup 99}{sub 48}Cd{sub 51}

Excited states of neutron deficient nuclei close to {sup 100}Sn were investigated in an in-beam spectroscopic experiment using the NORDBALL detector array. Excited states in {sup 99}Cd were identified for the first time. The measured half-life of an isomeric state in {sup 99}Cd indicates that the stability with respect to quadrupole shape changes is as large in {sup 100}Sn as for other heavy doubly magic nuclei. {copyright} {ital 1996 The American Physical Society.}