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Background: The initial observation of a negative-parity state in proximity to the ground state in the 1950s marked the advent of extensive research into octupole deformed nuclei. Since then, the physics of octupole deformed nuclei has consistently held a special interest within the field of nuclear physics. In the present era, with the advent of sophisticated radioactive ion beam (RIB) facilities and advanced detectors, coupled with the remarkable capabilities of high-performance computing, extensive and intensive explorations are being conducted from both experimental and theoretical perspectives to elucidate the physics of octupole deformed nuclei. Results: This work establishes the OD-RHF model, which provides a reliable tool for studying octupole nuclei over a fairly wide range. The reliability of the newly developed OD-RHF model is illustrated by taking the octupole nucleus ^144Ba as an example. Furthermore, the octupole deformation effects in ^144Ba is verified by using the RHF Lagrangians PKOi (i=1, 2, 3) and the RMF one DD-ME2. The intrusion of the neutron 1i₁₃/₂ and proton 1h₁₁/₂ components is demonstrated to play an essential role in determining the notable octupole deformation of ^144Ba using PKOi (i=1, 2, 3) and DD-ME2. It is indicated that the Fock terms play an important role in stabilizing the octupole deformation. More specifically, due to the repulsive tensor coupling between the intrude components and the core of ^144Ba, the tensor force component carried by the -PV coupling, that contributes only via the Fock terms, plays an opposing role in the formation of the octupole deformation of ^144Ba.
Peng et al. (Mon,) studied this question.