Discovery of 157 W and 161 Os
2010
The nuclides 157W and 161Os have been discovered in reactions of 58Ni ion beams with a 106Cd target.
The 161Os α-decay energy and half-life were 6890±12 keV and 640±60 μs. The daughter 157W nuclei
β-decayed with a half-life of 275±40 ms, populating both low-lying α-decaying states in 157Ta, which is
consistent with a 7/2− ground state in 157W. Fine structure observed in the α decay of 161Os places the
lowest excited state in 157W with Iπ =9/2− at 318±30 keV. The branching ratio of 5.5+3.1
−2.2% indicates
that 161Os also has a 7/2− ground state. Shell-model calculations analysing the effects of monopole
shifts and a tensor force on the relative energies of 2f7/2 and 1h9/2 neutron states in N=83 isotones are
presented.
Keywords:
- Correction
- Source
- Cite
- Save
- Machine Reading By IdeaReader
0
References
9
Citations
NaN
KQI