Yrast level structure of the neutron-deficient N = 80 isotones ~(146)Dy, ~(147)Ho and ~(148)Er up to high-spin values

摘要

High-spin level schemes of the N = 80 isotones ~(146)Dy, ~(147)Ho and ~(148)Er have been investigated by in-beam γ-ray spectroscopic methods using the NORDBALL Compton-suppressed multidetector array including proton and neutron selection. The projectile-target system ~(58)Ni + ~(92)Mo at 260 MeV beam energy has been used to produce the neutron-deficient N = 80 isotones. The previously known schemes have been extended to considerably higher spin and exitation energy, up to I = 23h, E_x ≈ 8.9 MeV in ~(146)Dy, I = 53/2h, E_x ≈ 8.7 MeV in ~(147)Ho and I = 23h, E_x ≈ 9.6 MeV in ~(148)Er. The results are discussed in terms of the spherical shell model. Many of the levels can be described within this framework.