Levels in exp 165 Tm Excited by the Decay of 9.8 Min exp 165 Yb

摘要

The decay of exp 165 Yb (T/sub 1/2/ = 9.8 min) has been investigated with Ge(Li), Si(Li) and Na(Ti) detectors, a toroidal beta -spectrometer and magnetic beta -spectrographs. The isobarically separated samples produced by the Y/SNAPP facility at the Dubna Institute were used. The simple gamma -ray spectra, the conversion electron spectra, prompt nad delayed gamma - gamma coincidences have been measured. The decay scheme of exp 165 Yb involving 40 excited states in exp 165 Tm has been proposed. 112 transitions from an observed 154 were introduced into the decay scheme. The level scheme of exp 165 Tm is extended by adding 10 new levels: 158.20.; 469.49.; 797.34; 830.98.; 889.85; 921.37; 1466.20; 1790.40; 1846.56 and 2194.91 keV. Spin, parity, log ft for exp 165 Tm levels and multipolarity for some transitions are determined. The first members of the rotational bands 1/2 exp + (411), 3/2 exp + (411), 5/2 exp + (402), 7/2 exp + (404), 1/2 exp - (541), 7/2 exp - (523) and 9/2 exp - (514) have been identified. (Atomindex citation 10:432014)