| Popis: |
The high-spin level structures of 152 Dy and 153 Dy were studied experimentally with 154, 155 Gd(α xnγ ) in-beam reactions, and for 152 Dy also with 144, 146 Nd ( 12 C, x n γ) reactions. The experiments included measurements of singles γ-ray and conversion-electron spectra, γ-ray angular distributions and E γ - t and E γ - E γ - t coincidences. A multiplicity filter set-up was used to study the feeding and decay of isomeric states in 152 Dy. In 152 Dy about twenty so far unknown levels were found, including two high-spin isomeric states with T 1 2 ≈ 60 and ≈ 13 ns at excitation energies E x ≈ 5.04 and 6.08 MeV, respectively. These states are compared with recent calculations on yrast traps. The level scheme of 153 Dy contains 28 levels up to E x = 4.1 MeV and J π = ( 37 2 + ) . Band structures in both nuclei are discussed in comparison with other N = 86 and N = 87 isotones. |
