The spectrometer of e-γ coincidences for on-line experiments

The e-γ coincidence spectrometer has been created on the base of a modernized beta-ray spectrometer of Gerholm type for investigations of short-lived nuclei in on-line experiments with the mass separator in the YASNAPP-2 facility. The energy resolution of the beta-ray spectrometer achieved is ΔBρ/Bρ=0.4-3% at transmission T=0.6-5%. The time resolution of the e-γ coincidence spectrometer is 2τ0=0.41-1 ns depending on a type of imployed detectors and energies of registered radiations. The branching factor in off-line experiments for 138 keV level of 169Tm has been determined as f=0.35(3). The ICE spectra for nuclei with A=150-160 have been measured in on-line experiments. The lifetimes of excited states have been measured for 39 keV level in 155Dy - (3.4±0.4) ns, 110 keV level in 155Ho (<0.7) ns and 74.4 keV level in 158Tm - (1.74±0.04) ns. 19 refs.; 16 figs