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We have searched for back-decay gamma rays from the shape isomeric states in /sup 235/U, /sup 236/U, and /sup 238/U possibly excited in muon radiationless transition. The energies and intensities of gamma rays following muon atomic capture were measured as a function of time after muon stopping. Background was suppressed by requiring that the candidate gamma ray be followed by another gamma ray (..mu..-capture gamma ray). The prompt gamma-ray spectra included the U-muonic x rays. The measured /sup 235/U and /sup 238/U x-ray energies were in good agreement with previously reported results. The x-ray spectrum from /sup 236/U has not been previously reported. The /sup 236/U spectrum is very similar to that of /sup 238/U, except that the K x-rays exhibit an isotope shift of approximately 20 keV, the /sup 236/U energies being higher. In the analysis of the delayed spectra of /sup 236/U and /sup 238/U using the GAMANL peak searching program, and with an effective lower-limit detection efficiency of .15% per stopping muon, no candidate gamma rays for the back decay transitions from the shape isomeric state were observed.

Search for the gamma-branch of the shape isomers of separated U isotopes using muon for nuclide excitation