ISSN:
1434-601X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract A 1.4 ± 0.1 min activity which is assigned to β−-decay of 68 173 Er has been produced with 14–15 MeV neutrons through the reaction176Yb(n, α)173Er. Its decay has been studied with Ge(Li) detectors and several (γ)(γ) as well as (γ)(β) coincidence arrangements. Eight gamma rays with energies 94.2, 116.14, 118.6, 122.40, 192.8, 199.2, 800.8 and 895.2 keV were assigned to the decay of173Er. The proposed level scheme of the daughter nuclide 69 173 Tm contains levels at 0, 2.5, 118.6, 124.9, 317.7, 411.9 and 1212.8 keV. The 317.7 keV level is an isomeric state with a measured half-life of 10±3 μs. This 10 μs isomer and the 411.9 keV level are thought to be the band head and 9/2− rotational member of 7/2− [523] Nilsson state, respectively. The levels at 0, 2.5, 118.6 and 124.9 keV are interpreted as 1/2+, 3/2+, 5/2+ and 7/2+ members of the 1/2+ [411] band and the level at 1212.8 keV as the 9/2− [514] Nilsson state. Some systematic considerations and theoretical transition probability calculations are also included.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01387301
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