Abstract
Irradiation of Yb isotopes with pulsed beams of 8–13 MeV protons and deuterons has led to the discovery of the following new isometric transitions in the Lu isotopes: a 29 keV, 160 sec, E3 transition in 169Lu; a 70 keV, 76 sec, E3 transition in 171Lu; a 345 keV, 1.3 μsec, E1 transition in 175Lu; a 0.67 sec level in 170Lu decaying by a 48 keV, M2 transition and a 44 keV, E2 transition; and a 64 keV, 430 μsec, E1 transition in 172Lu. The isomerism in the odd-mass isotopes is ascribed to the [541] 1 2 − Nilsson state, in analogy to the well-studied case in 173Lu. The results are discussed in relation to the parameters of the Nilsson model.
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