Abstract:

Ground-state properties and low-energy spectra of isotopes ^250−262No are systematically investigated in the framework of self-consistent Quasiparticle Random-Phase Approximation (QRPA) with Skyrme forces SLy6, SkM*, and SVbas. The quadrupole, octupole, and hexadecapole excitations and some K-isomers of a high multipolarity are considered. The main attention is paid to isotopes ²⁵²No and ²⁵⁴No, for which the most extensive experimental spectroscopic information is available. In particular, there is an analysis of a possible shell gap in neutron single-particle spectrum and corresponding break of the neutron pairing in these isotopes. The features and assignment of K-isomers are discussed in detail. The low-energy pairing vibrational states 0⁺ are predicted.