Decay properties of 150Tm and 150Er
Abstract
The decay properties of 150Tm and 150Er (produced in 58Ni bombardments of 96Ru) were investigated following on-line mass separation. The half-life of 150Tm was measured to be 2.2+/-0.2 s rather than the value of 3.5 s available in the literature. Based on its decay characteristics, we suggest that this high-spin 150Tm isomer has a spin assignment of 6-. Among the 150Er states fed by this 6- isomer is the yrast 4+ level (2294.8 keV) which up to now has been observed in neither β-decay nor in-beam γ-ray studies. New transitions observed in 150Er decay establish several previously unknown levels in 150Ho. While the additional γ rays reduce from 100% to 96% the feeding to the 476-keV state in 150Ho known earlier, the corresponding logft value is calculated to be 3.6, indicating that this is an allowed, 0+-->1+, beta transition. Photon intensities obtained for γ rays following the decay of the 150Ho low-spin isomer resolve inconsistent values measured in two previous investigations.
- Publication:
-
Physical Review C
- Pub Date:
- February 1987
- DOI:
- 10.1103/PhysRevC.35.620
- Bibcode:
- 1987PhRvC..35..620T
- Keywords:
-
- 23.20.Lv;
- 27.70.+q;
- gamma transitions and level energies;
- 150<
- =A<
- =189