() reaction studies of Dy and Hf |
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| Authors: | DG Burke G Lvhiden |
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| Institution: | aDepartment of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1 Canada;bDepartment of Physics, University of Oslo, PO Box 1048, Blindern, N-0316 Oslo, Norway |
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| 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 Kπ=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 Kπ=3/2− partner. |
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| Keywords: | Nuclear reactions 163Dy 177Hf(t p) E=17 MeV measured σ (Ep θ ) 165Dy 179Hf deduced levels L-values L=0 strengths Enriched targets magnetic spectrograph Systematic trends in neighboring nuclides discussed |
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