# Longitudinal Wobbling Motion in $^{187}$Au

## TL;DR

This paper reports the first experimental evidence of longitudinal wobbling bands in the nucleus $^{187}$Au, combining angular distribution measurements with theoretical Particle Rotor Model calculations to confirm this exotic collective motion.

## Contribution

It provides the first experimental identification of longitudinal wobbling bands and demonstrates their consistency with theoretical models, expanding understanding of nuclear collective motions.

## Key findings

- Identification of longitudinal wobbling bands in $^{187}$Au
- Agreement between experimental data and Particle Rotor Model calculations
- Establishment of longitudinal wobbling as a general nuclear phenomenon

## Abstract

The rare phenomenon of nuclear wobbling motion has been investigated for the nucleus $^{187}$Au. A longitudinal wobbling-bands pair has been identified and clearly distinguished from the associated signature-partner band on the basis of angular distribution measurements. Theoretical calculations in the framework of the Particle Rotor Model (PRM) are found to agree well with the experimental observations. This is the first experimental evidence for longitudinal wobbling bands where the expected signature partner band has also been identified, and establishes this exotic collective mode as a general phenomenon over the nuclear chart.