# The $\Delta I$=2 bands in $^{109}$In: possible antimagnetic rotation

## TL;DR

This study investigates high-spin rotational bands in $^{109}$In, identifying new gamma-ray transitions and suggesting possible antimagnetic rotation based on experimental data and relativistic mean-field calculations.

## Contribution

The paper reports the discovery of eleven new gamma-ray transitions in $^{109}$In and proposes the first candidate bands for antimagnetic rotation in this nucleus.

## Key findings

- Eleven new gamma-ray transitions identified in $^{109}$In.
- Confirmation of $ riangle I=2$ rotational bandheads.
- Possible antimagnetic rotation candidates suggested.

## Abstract

The high-spin structure of $^{109}$In was investigated with the $^{100}$Mo($^{14}$N, 5$n$)$^{109}$In fusion-evaporation reaction at CIAE, Beijing. Eleven new $\gamma$-rays of $^{109}$In were identified, by which the bandheads of the $\Delta I$=2 rotational bands were confirmed. The configurations were assigned with the help of the systematic discussion. Furthermore, the rotational bands are compared with the tilted-axis cranking calculations based on a relativistic mean-field approach. The rotational bands involving the $1p1h$ excitation to the $\pi$$d_{5/2}$ and $\pi$$g_{7/2}$ orbitals are suggested as candidates for antimagnetic rotation based on the theoretical results.