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Nuclear Theory·nucl-th

Tuesday·March 8, 2022

11 papers—4 primary·7 cross-listed

All11Primary4Cross-lists7
  1. 01

    Theory of nuclear collective vibrations

    Haozhao Liang · Elena Litvinova

    We review the theory of nuclear collective vibrations evolved over decades from phenomenological quasiclassical picture to sophisticated microscopic approaches. The major focus is put on the underlying microscopic mechanisms of emergent effects, which define the properties of giant resonances and soft modes. The response of atomic nuclei to electromagnetic and weak fields is discussed in detail. Astrophysical implications of the giant resonances and soft modes are outlined.

    nucl-th0 citations
  2. 02

    The nuclear symmetry energy from relativistic Brueckner-Hartree-Fock model

    Chencan Wang · Jinniu Hu · Ying Zhang · Hong Shen

    The microscopic mechanisms of the symmetry energy in nuclear matter are investigated in the framework of the relativistic Brueckner-Hartree-Fock (RBHF) model with a high-precision realistic nuclear potential, pvCDBonn A. The kinetic energy and potential contributions to symmetry energy are decomposed. They are explicitly expressed by the nucleon self-energies, which are obtained through projecting the -matrices from the RBHF model into the terms of Lorentz covariants. The nuclear medium effects on the nucleon self-energy and nucleon-nucleon interaction in symmetry energy are discussed by comparing the results from the RBHF model and those from Hartree-Fock and relativistic Hartree-Fock models. It is found that the nucleon self-energy including the nuclear medium effect on the single-nucleon wave function provides a largely positive contribution to the symmetry energy, while {the nuclear medium effect on the nucleon-nucleon interaction, i.e., the effective -matrices generates the negative contribution}. The tensor force plays an essential role in the symmetry energy around the density. The scalar and vector covariant amplitudes of nucleon-nucleon interaction dominate the potential component of the symmetry energy. Furthermore, the isoscalar and isovector terms in the optical potential are extracted from the RBHF model. The isoscalar part is consistent with the results from the analysis of global optical potential, while the isovector one has obvious differences at higher incident energy due to the relativistic effect.

    nucl-thCPC(2022)·6 citations
  3. 03

    Seniority and configurations in neutron-rich Nickel isotopes

    S. Sidorov · D. Zhulyaeva · T. Tretyakova

    Excited states in low-energy spectra in Ni are considered. To this end, pairing forces in form of surface delta interaction are employed to account for formation of the ground state multiplet with seniority states. The multiplet splitting is described with mass relations of masses of neighbouring nuclei. Subsequently, seniority model is used to reproduce or predict the states in odd-even isotopes and in even-even isotopes. Correct account of state should allow for description of reversed order of states with and observed in experiment. The results obtained are compared with the structure of similar multiplets in isotones.

    nucl-thnucl-exCPC(2022)·3 citations
  4. 04

    Charge radii of Ca isotopes and correlations

    G. Co' · M. Anguiano · A. M. Lallena

    We study the effects of short- and long-range correlations on the charge radii of Ca isotopes. We start our investigation with an independent particle model consisting in Hartree-Fock plus Bardeen-Cooper-Schrieffer calculations with finite-range effective nucleon-nucleon interactions of Gogny type. The short-range correlations effects are evaluated by considering all the terms of a cluster expansion containing a single correlation line. The long-range correlations are taken into account by including the coupling with the quasi-particle random phase approximation phonons. While the effects of the short-range correlations are negligible, those of the long-range correlations largely modify the independent particle model results and improve the agreement with the experimental data.

    nucl-thPRC(2022)·10 citations

Affiliations

first authorsco-authorsvia INSPIRE