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arXiv · 1912.11147

Role of residual interaction in the relativistic description of M1 excitation

Tomohiro Oishi·Goran Kruzic·Nils Paar
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Abstract

Magnetic dipole (M1) excitation is the leading mode of multi-nucleon excitations induced by the magnetic field, and is a phenomenon of the spin-orbit (SO) splitting and residual interactions involved. In this work, we investigate the effects of the residual interactions on the M1 excitation from a novel perspective, the framework of relativistic nuclear energy-density functional (RNEDF). The relativistic Hartree-Bogoliubov (RHB) model is utilized to determine the nuclear ground state properties, while the relativistic quasi-particle random-phase approximation (RQRPA) is employed for the description of M1-excitation properties. From the analysis of M1 mode in the Ca isotope chain, role of the isovector-pseudovector (IV-PV) residual interaction is discussed. For open-shell nuclei, the pairing correlation also plays a noticeable role in the M1 mode. The experimental data on M1 mode is expected to provide a suitable reference to improve and optimize the theoretical aspects to describe the residual interactions.

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Tomohiro Oishi, Goran Kruzic, Nils Paar. 2020-10-02. Role of residual interaction in the relativistic description of M1 excitation. https://doi.org/10.1088/1361-6471%2Fabaeb1

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