Search for Seniority Isomers:. Lifetime Measurements in 93Tc and 95Ru

The shell model in N ≈ 50 nuclei with few valence nucleons predicts high-spin states, whose decays are severely inhibited, due to selection rules of the single-particle transitions and/or the need to recouple both types of nucleons. Such seniority isomers play a dominant role in the interpretation of shell model structures, as will be discussed on the basis of lifetime measurements in ⁹³Tc and ⁹⁵Ru.