Low spin states in Ie1Hf f r o m the thermal neutron capture reaction.

The decay properties of high-spin states in 39K have been investigated by means of the 36Ar(α,pγ)39K reaction at E α=10-14 MeV. From measurements of the yield function and the angular distribution of the γ-transitions it can be concluded that the following states have been excited: 2 814 keV, 7/2-, 3 597 keV, 9/2-, 3 943 keV, 11/2-, 4 126 keV, 5/2(-), 4 521 keV, 9/2(-) (11/2-), 5 717 keV, 13/2 and 6 474 keV, (15/2). Multipole mixing ratios and transition strengths are given for some transitions. Comparisons are made with a recent shell-model calculation and with calculations involving collective features.

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The energies and intensities of high energy gamma radiation from thermal neutron capture in an enriched sample of 174Yb have been determined by means of a Ge(Li) pair spectrometer. An internal reactor target has been used. A number of new primary gamma lines corresponding to transitions in 175Yb between the capture state and energy levels up to 2.2 MeV with low K-values have been observed. The neutron separation energy of 175Yb was found to be 5 822.6±0.5 keV.

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