Anomalous collective modes in atomic nuclei within the proton-neutron interacting boson model

Authors

Wei Teng, Liaoning Normal University
Yu Zhang, Liaoning Normal University
Sheng Nan Wang, Liaoning Normal University
Feng Pan, Liaoning Normal University
Chong Qi, The Royal Institute of Technology (KTH)
J. P. Draayer, Louisiana State University

Document Type

Article

Publication Date

6-1-2025

Abstract

Novel collective modes characterized by a B4/2 ratio (≡B(E2;41⁺→21⁺)/B(E2;21⁺→01⁺)) less than 1.0 that were observed recently have been identified within the proton-neutron interacting boson model (IBM-2) using the consistent-Q Hamiltonian. These modes are shown to give rise to triaxial spectral features, including significant band mixing. The results provide a compelling explanation for the deeply suppressed B4/2 ratio observed in ¹⁶⁶W, ^168,170Os, and ¹⁷²Pt, offering new insights into the B(E2) anomaly phenomenon in neutron-deficient nuclei.

Publication Source (Journal or Book title)

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics

Recommended Citation

Teng, W., Zhang, Y., Wang, S., Pan, F., Qi, C., & Draayer, J. (2025). Anomalous collective modes in atomic nuclei within the proton-neutron interacting boson model. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 865 https://doi.org/10.1016/j.physletb.2025.139487