Abstract
The half-lives of the following intrinsic states in deformed odd-mass nuclei has been measured by delayed coincidences with a time-to-amplitude converter:
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(1)
5/2 5/2+[642] at 86.5 keV in155Gd:T 1/2=6.7±0.3 ns, which results in the determination of theE1,ΔK=1 transition probability to the ground state 3/2 3/2−[521] and first rotational state 5/2 3/2−[521], yielding hindrance factors ofF N ≈5.5 and ≈1.8 (F W =3.1×104 and 2.3×104) respectively.
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(2)
(3) 5/2 5/2−[512] at 191.4 keV in169Yb:T 1/2=3.35±0.15 ns and at 122.39 keV in171Yb:T 1/2=265±20 ns which results in the determination of the transition probabilities of theE1,ΔK=1 transitions to the ground states 7/2 7/2+[633], of theK-forbiddenM1 transitions to the 5/2 and 3/2 1/2−[521] and of theE2 transitions to the 5/2, 3/2 and 1/2 1/2−[521] states in both nuclei.
TheE1 transition probabilities are compared to the transitions between the same Nilsson states in173Yb and175Hf discussing the influence of the position of the Fermi surface — obtained from recent stripping and pick-up reactions — on these transition probabilities.
Additional information on the decay scheme of171Lu→171Yb is obtained by delayed coincidence measurements.
For testing the used time-to-amplitude converter the well known half-lives of the 482 keV level in181Ta (T 1/2=10.4±0.3 ns) and of the 279 keV level in203Tl (T 1/2=0.285 ±0.015 ns) were measured, in good agreement with other measurements.
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The author is indebted to Professor Dr.R. van Lieshout and Professor Dr. A.H.Wapstra for many fruitful discussions and to Miss J. C.Kapteijn and Mr. J.Visser for performing the irradiations and the chemical preparations. He would also like to thank Professor Dr. P.C.Gugelot, Professor Dr.R. van Lieshout and Professor Dr. A.H.Wapstra for their kind hospitality while at the Institute. The author gratefully acknowledges a fellowship from the North Atlantic Treaty Organization. This work is part of the research program of the Institute for Nuclear Physics Research (I.K.O.), made possible by the financial support from the Foundation for Fundamental Research of Matter (F.O.M.) and the Netherlands Organization for Pure Scientific Research (Z.W.O.).
Tamura, T.: Nuclear Phys. A 115, 193 (1968).
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Löbner, K.E.G. Half-life measurements of intrinsic states in deformed odd-mass nuclei. Z. Physik 216, 372–397 (1968). https://doi.org/10.1007/BF01391531
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DOI: https://doi.org/10.1007/BF01391531