Abstract
A new type of nuclear collective motion - the spin scissors mode - was predicted seven years ago. Promising signs of its existence in 232Th were found. We perform a systematic analysis of experimental data on M1 excitations in rare-earth nuclei to find traces of the spin scissors mode in this area. Obvious signs of its existence are demonstrated.
Highlights
The nuclear scissors mode was predicted by R
The Wigner Function Moments (WFM) method predicts a new type of nuclear collective motion – the spin scissors mode: rotational oscillations of nucleons with spin projection "up" with respect of "spin-down" nucleons
A generalization of the WFM method which takes into account spin degrees of freedom and pair correlations si
Summary
The nuclear scissors mode was predicted by R. R. Hilton [1] as a counter-rotation of protons against neutrons in deformed nuclei. Hilton [1] as a counter-rotation of protons against neutrons in deformed nuclei This idea was developed in the works of T. The aim of the present work – to find the experimental confirmation of the splitting of low-lying (E < 4 MeV) M1 excitations in two groups corresponding to spin and orbital scissors. It turns out that the splitting of low-lying M1 excitations in two groups was observed and discussed by experimentalists already at the beginning of the "scissors era". The Wigner Function Moments (WFM) method predicts a new type of nuclear collective motion – the spin scissors mode: rotational oscillations of nucleons with spin projection "up" with respect of "spin-down" nucleons. A generalization of the WFM method which takes into account spin degrees of freedom and pair correlations si-
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