Study of 0+ and 8- states in even-even 250-260No isotopes
Abstract
Low-lying Kπ=0+ and isomeric 8- states in even-even isotopes 250-260No are explored within the Quasiparticle Random-Phase Approximation (QRPA) method with Skyrme parametrization SLy4. The deformations, single-particle (s-p) spectra and pairing in the isotopes are inspected. The calculations predict a pronounced minimum in the neutron pairing at A=252, 254, which significantly affects the properties of 0+ and 8- states and leads to a correlation of their spectra. It is shown that 8- isomers are basically low-energy two-quasiparticle (2qp) states. The appearance or absence of these isomers in 250-260No is explained as a combined effect of the s-p spectra and pairing. The collective 0+ states are predicted in all the isotopes as the lowest multipole non-rotational excitations. These states are interpreted as a superposition of pairing vibrations and β-vibrations. The results are in a reasonable agreement with available experimental data for 252,254No.
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