Half-life of sup(77m)Se, sup(167m)Er and sup(197m)Au

Isomer states of three nuclides were excited by bremsstrahlung from a 4.5MeV linear electron accelerator, and their half-lives were measured by counting their γ radiation with a well-type NaI(Tl) detector. A pneumatic rabbit system was used for fast sample transport. The obtained half-life values in seconds are sup(77m)Se: 17.31+-0.08, sup(167m)Er: 2.269+-0.006 and sup(197m)Au: 7.73+-0.06. The results are compared with literature data. New half-life measurements were performed on three short lived odd-A nuclear isomers, since the uncertainty of the values published earlier is very striking. The isomeric states were excited by (γ,γ') reaction. A relatively low exciting energy (below the energy required for particle emission) was chosen to obviate excitation of other nuclides. (author)