# Triplet structure of nuclear scissors mode

## TL;DR

This paper reveals that the nuclear scissors mode splits into three branches due to spin effects, with two new modes contributing to magnetic dipole strength, supported by theoretical calculations and experimental data.

## Contribution

It introduces a triplet structure of the nuclear scissors mode and demonstrates the coherence of Wigner Function Moments and QPNM methods with experimental results.

## Key findings

- Splitting of the scissors mode into three branches.
- Identification of two new spin-related modes.
- Good agreement between theory and experiment.

## Abstract

The fine structure of the scissors mode is investigated within the Time Dependent Hartree-Fock-Bogoliubov (TDHFB) approach. The solution of TDHFB equations by the Wigner Function Moments (WFM) method predicts a splitting of the scissors mode into three intermingled branches. Together with the conventional scissors mode two new modes arise due to spin degrees of freedom. They generate significant $M1$ strength below the conventional energy range. The results of calculations of scissors resonances in Rare Earths and Actinides by WFM and QPNM methods are compared with experimental data. A remarkable coherence of both methods together with experimental data is observed.