Multi-quasiparticle excitations of 91Ru

• 来源期刊: 中国物理C（英文版）
• 年，卷（期）: 2020,（2）
• 页码范围: 80-87
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1137/44/2/024002

摘要

The level structure in neutron-deficient nucleus 91Ru was investigated via the 58Ni (36Ar,2plny) 91Ru reaction at a beam energy of 1 1 1 MeV.Charged particles,neutrons,and γ-rays were emitted in this reaction and detected by the DIAMANT CsI ball,Neutron Wall,and the EXOGAM Ge clover array,respectively.In addition to the previously reported levels in 91Ru,new low-to-medium spin states were observed.Angular correlation and linear polarization measurements were performed to unambiguously determine spins and parities of the excited states in 91Ru.The low-spin states of 91Ru exhibit a scheme of multi-quasiparticle excitations,which is very similar to that of the neighboring N =47 isotone.These excitations have been interpreted in terms of the shell model.The calculations performed in the configuration space (P3/2,f5/2,P1/2,g9/2) reproduce the experimental excitation energies reasonably well,supporting the interpretation of the newly assigned positive-parity states in terms of the three quasiparticle configurations π(g9/2)-2v(g9/2)-1 and v(g9/2)-3.