The decay of 188Re

The γ-ray spectra of 188Re decay were studied by using two Ge(Li) spectrometers and a three-parameter (E-E-T) list conicidence system. The energies and relative intensities of 52 γ-rays and cascade relations of 14 γ-rays are determined. Ten new γ-rays: 155 (633-478), 984, 1096, 1463, 1332, 1530, 1574, 1810, 1867, and 1937 keV were identified. The 155 transition is confirmed and its relative intensity is estimated by means of coincidence experiment. 24 levels of 188Re are assigned. Among those, 6 levels are first put into the decay scheme of 188Re. In addition to 1443 keV and 1937 keV levels, 1685, 1729 and 1965 keV levels are also observed in the decay of 188Ir and other reaction studies. The 1948 level is recently suggested in the 190Os(p,t)188Os reaction. The 486 keV and 811 keV γ-transitions are also put into the level scheme of 188Re. The β- decay branching ratio is deduced. (author)