New isomer in 80Y

Journal article

The ß+/EC decay of mass-separated A = 80 nuclei was studied by means of ß- and γ-ray spectroscopy after the bombardment of a 24Mg target with 58Ni ions at 190 MeV. A new 1- isomer at 228.5(1) keV has been identified in 80Y with a half-life of 4.7(3) s. This new isomer decays to the 4- ground state with an 81(2)% branch and by ß+/EC transitions to levels in 80Sr with a 19(2)% branch. The half-life of the 80Y ground-state decay has been remeasured to be 30.1(5) s. A level scheme for the low-lying states in 80Y is presented. Hartree-Fock-Bogolyubov calculations show a large prolate deformation for these states, and two-quasiparticle + rotor model calculation results suggest that the low-lying states can be reproduced by inclusion of an effective proton-neutron residual interaction. The dominating Nilsson configurations for the 4- ground state and the 1- isomeric state have been found to originate from the parallel and antiparallel coupling of the proton [422]5/2+ and the neutron [301]3/2- orbitals.

Authors: Döring, J; Schatz, H; Aprahamian, A; De Haan, R; Görres, J

• Journal: Physical Review C - Nuclear Physics
• Volume: 57
• Issue: 3
• Pages: 1159-1166
• Publication date: 1998-03-01
• DOI: 10.1103/PhysRevC.57.1159
• EISSN: 1089-490X
• ISSN: 0556-2813
• Language: English