Exploring chiral rotation in A ≈ 60 nuclei: Role of residual interactions

• DOI: 10.1088/1674-1137/adc3fd
• Publication Date: 2025-03-24T07:48:43Z
• Authors: Jing 彭婧 Peng; QiBo Chen

Abstract In order to explore the possible existence of nuclear chirality in the A ≈ 60 mass region, the doublet bands
 built on the configuration π f−1
 7/2 ⊗νg1
 9/2 are studied using the particle rotor model (PRM) with residual proton
neutron interactions Vpn for cobalt isotopes. The energy spectra E(I), energy difference between the doublet
 bands ∆E(I), electromagnetic transition probabilities B(M1) and B(E2), the energy staggering S(I) of the dou
blet bands are calculated by varying the deformation parameters β and γ, and moment of inertia J. The PRM
 calculations show that the parameters for the ideal chirality of the configuration π f−1
 7/2 ⊗νg1
 9/2 are β = 0.25,
 γ =34◦, and J =10 ¯h2/MeV. Subsequently, PRM calculations adopting these parameters show that ∆E(I)
 and S(I) are sensitive to the residual proton-neutron interactions Vpn. The weaker Vpn, the more conducive it
 is to the existence of nuclear chirality. Finally, the evolution of the chirality with spin I is illustrated by the
 probability of the total angular momentum along the principal axes (K distribution) and the orientation with
 respective to the intrinsic frame P(θ,ϕ).