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R J Guo1, S Y Wang1, C Liu1

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Researchers identified chiral bands in bromine-74 nuclei, suggesting the first evidence of chiral wobbling excitations in atomic nuclei. This finding advances our understanding of nuclear structure and dynamics.

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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.