Nuclear Data Sheets for A=160

Gamma ray spectroscopic studies of the ..beta.. decay of /sup 160/Tm have led to the identification of a new 74.5 s isomer in the /sup 160/Tm nucleus. This isomer is found to emit seven new ..gamma.. rays of 375.8, 738.7, 840.8, 926.7, 1104.1, 1115.8, and 1186.1 keV which populate six new levels in /sup 160/Er at 765.7, 1128.6, 1230.3, 1316.6, 1505.7, and 1576.0 keV. The 765.7 keV level is the 6/sup +/ member of the ground-state band known from in-beam ..gamma..-ray studies, whereas the 1128.6-, 1316.6-, and 1505.7-keV levels are tentatively assigned as the 4/sup +/, 5/sup +/, and 6/sup +/ members of the ..gamma.. band, respectively. The 1230.3-keV level is proposed as the 4/sup +/ member of the ..beta.. band.

Identification and decay of an isomer in /sup 160/Tm

Excited states of the doubly odd deformed nucleus 160Tm

The reduced probabilities of the E2 intraband and interband transitions in even-even erbium isotopes (A=158–170) andN=94 isotones (A=158–164) are analysed in the frame of the perturbation theory assuming the mixing of the wave functions of ground, beta- and gammavibrational states as well as different values of the intrinsic quadrupole moments of these states.

Reduced probabilities of gamma transitions in even-even deformed nuclei

Fortschrittsberichte: Stand Und Entwicklungstendenzen Auf Dem Gebiet Der Isotopenproduktion (Einschliesslich Analytik) Radionuklide Und Radioaktiv Markierte Organische Verbindungen: Gewinnung trägerfreier Radionuklide der Lanthaniden

The decay of162Yb,162Tm and160Tm has been investigated with Ge(Li) and Si(Li) detectors using isotopically separated samples produced by the YASNAPP facility at Dubna. The singles γ-ray spectrum, β-γ and γ-γ coincidences were measured. Strong ytterbium and thulium activities were used for conversion electron measurements with high resolution magnetic β-spectrographs. 3, 134 and 39 new γ-rays were attributed to the decays of162Yb,162Tm and160Tm, respectively. Decay schemes of these isotopes are proposed. Three and 12 new levels were found in162Er and160Er, respectively. TheQ-values of162Yb,162Tm and160Tm were determined to be ≦2·2, MeV, 4·6±0·3 MeV and 4·9±0·5 MeV, respectively.

The decay chain162Yb (19·0 min) →162Tm (21·8 min) →162Er and the decay of160Tm (9·2 min) TO160Er

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The decay chain162Yb (19·0 min) →162Tm (21·8 min) →162Er and the decay of160Tm (9·2 min) TO160Er