Evidence for Chiral Wobbler in Nuclei

Area of Science:

• Nuclear Physics
• Atomic Spectroscopy
• Quantum Mechanics

Background:

• Understanding nuclear structure and collective excitations is crucial in nuclear physics.
• Chirality in atomic nuclei is a complex phenomenon that challenges existing nuclear models.
• The bromine-74 nucleus provides a unique system to study these phenomena.

Purpose of the Study:

• To identify and characterize nuclear bands in _{35}^{74}Br_{39} with a πg_{9/2}⊗νg_{9/2} configuration.
• To investigate the possibility of chiral symmetry and wobbling excitations in this nucleus.
• To provide experimental evidence for the first chiral wobbler in nuclei.

Main Methods:

• Performed angular distribution and linear polarization measurements.
• Conducted lifetime measurements to determine transition probabilities.
• Utilized the quantum particle rotor model for theoretical comparisons.

Main Results:

• Identified three ΔI=1 bands in _{35}^{74}Br_{39}.
• Determined multipolarity, type, mixing ratio, and absolute transition probabilities.
• Suggested the second and third bands as chiral partner and one-phonon wobbling excitation, respectively.

Conclusions:

• The experimental data strongly support the identification of chiral bands in _{35}^{74}Br_{39}.
• The findings provide the first experimental evidence for chiral wobbling excitations in atomic nuclei.
• This study opens new avenues for exploring chirality and complex dynamics in nuclear systems.