Abstract
Angular distributions for the 163Dy( t , p ) and 177Hf( t , p ) reactions were measured using 17 MeV tritons from the McMaster University Tandem Van de Graaff accelerator. Reaction products were analyzed with a magnetic spectrograph and detected with photographic emulsions. Favored L = 0 transitions confirmed assignments of the 5 / 2 − [ 523 ] band in 165Dy and 7 / 2 − [ 514 ] band in 179Hf. Additional L = 0 transitions in each nuclide identified previously unknown 5 / 2 − levels in 165Dy and 7 / 2 − ones in 179Hf. Overall trends of L = 0 strengths support the existence of subshell closures at neutron numbers 98 and 108. On the basis of a relatively strong L = 2 transition, the K π = 11 / 2 − γ-vibration based on the 7 / 2 − [ 514 ] state is identified at 1689 keV in 179Hf, about 440 keV above its previously-assigned K π = 3 / 2 − partner.
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