Abstract
The level structure of Dy165 has been investigated at the Karlsruhe research reactor using thermal neutron capture in Dy164. The target was Dy2O3 enriched to 92.71% Dy164. Neutrons were either monochromized by Bragg reflection from a lead crystal or transmitted through a bismuth single crystal filter. High-resolution measurements of the capture spectrum have been performed by means of a Ge(Li) 5-detector pair spectrometer and a Ge(Li) anti-Compton assembly. A large number of new lines has been observed. Cascade relationships were studied by using several techniques: a double coincidence apparatus with 4″ O×5″ NaI(Tl) detectors, a coincidence system containing a scintillation detector and a 34 cm3 Ge(Li)-diode as well as a two-parameter system involving the pair spectrometer (with NaI (Tl) as the primary detector) and a single 4″O×6″ NaI (Tl) counter. In the framework ofNilsson's model and simple microscopic pictures of vibrational states the results are consistent with the following spectroscopic interpretation: 0 keV, 7/2+[633]; 108.2 keV, 1/2−[521]; 184.3 keV, 5/2″[512]; 533.5 keV, 5/2″ [523]; 538.6 keV, 7/2+[633] +Q22; 570.3 keV, 5/2−[512]+Q22+1/2−[510]; 573.6 keV, 3/2− [521]+1/2−[521]+Q22; 1103.3 keV, 1/2− [521]+Q22+3/2− [521]. For comparison preliminary results are given for the isotonic nucleus Yb169.
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