Low-Energy M1 States in Deformed Nuclei: Spin Scissors or Spin-Flip?

Nesterenko V.O. Vishnevskiy P.I. Repko A. Kvasil J.
December 2022 Pleiades Publishing

Physics of Atomic Nuclei
2022 #85 Issue 6 858 - 867 pp.

Abstract: The low-energy M1 states in deformed ¹⁶⁴Dy and spherical ⁵⁸Ni are explored in the framework of fully self-consistent Quasiparticle Random-Phase Approximation (QRPA) with various Skyrme forces. The main attention is paid to orbital and spin M1 excitations. The obtained results are compared with the prediction of the low-energy spin-scissors M1 resonance suggested within Wigner Function Moments (WFM) approach. A possible relation of this resonance to low-energy spin-flip excitations is analyzed. In connection with recent WFM studies, we consider evolution of the low-energy spin-flip states in ¹⁶⁴Dy with deformation (from the equilibrium value to the spherical limit). The effect of tensor forces is briefly discussed. It is shown that two groups of 1⁺ states observed at 2.4–4 MeV in ¹⁶⁴Dy are rather explained by fragmentation of the orbital M1 strength than by the occurrence of the collective spin-scissors resonance. In general, our calculations do not confirm the existence of this resonance.

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Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Moscow region, Dubna, 141980, Russian Federation
State University ‘‘Dubna’’, Moscow Region, Dubna, 141980, Russian Federation
Moscow Institute of Physics and Technology, Moscow Region, Dolgoprudny, 141701, Russian Federation
Institute of Nuclear Physic Almaty, Almaty, Kazakhstan
Institute of Physics, Slovak Academy of Sciences, Bratislava, 84511, Slovakia
Institute of Particle and Nuclear Physics, Charles University, Praha 8, CZ-18000, Czech Republic

Laboratory of Theoretical Physics
State University ‘‘Dubna’’
Moscow Institute of Physics and Technology
Institute of Nuclear Physic Almaty
Institute of Physics
Institute of Particle and Nuclear Physics

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