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Nuclear Theory·nucl-th

Wednesday·November 23, 2022

14 papers—5 primary·9 cross-listed

All14Primary5Cross-lists9
  1. 01

    Pion Exchange Interaction in Bonn Potential and Relativistic and Non-relativistic Framework in Nuclear Matter

    Jinniu Hu🇨🇳 · Chencan Wang🇨🇳

    As the residual interaction of quantum chromodynamics in low-energy region, the nucleon-nucleon (NN) potential can only be exactly described by the model picture now. In the Bonn potential, one of the most well-known NN interaction models, the nucleons interact with each other through exchanging the pion and several heavier mesons, where the pion plays an essential role. It provides a partial contribution of tensor force in the intermediate-range region and the main component in the long-range region in NN potential. However, it is very difficult to be treated in the nuclear many-body system due to its pseudovector or pseudoscalar property. Recently, three high-precision charge-dependent Bonn potentials were proposed with pseudovector coupling types and different pion-nucleon coupling strengths and applied them to study the properties of nuclear matter and neutron stars in the non-relativistic and relativistic frameworks. Furthermore, to properly deal with the strong short-range repulsion and tensor force of the NN potential, some new relativistic {\it ab initio} methods have also been developed in the past decade to discuss the role of pion and relativistic effects in nuclear matter.

    nucl-th0 citations
  2. 02

    Peculiarity of the stellar CNO cycle with energetic particles

    Victor T. Voronchev

    A peculiarity of the stellar CNO cycle caused by MeV alpha-particles and protons generated in exoergic nuclear processes is analyzed. The main parameters of these particles and suprathermal reactions induced by them in a stellar core are calculated. It is shown that these reactions can trigger an abnormal nuclear flow in the second branch of the stellar CNO cycle. A conjecture is made that the phenomenon is of a general nature and can manifest in various stars at non-exploding stages of their evolution. The influence of the abnormal flow on some CNO characteristics is demonstrated.

    nucl-thastro-ph.SRPhys.Scripta(2023)·0 citations
  3. 03

    Role of neutron transfer in the reaction mechanism of Be+Tm, Ta, Re and Au systems

    Prasanna M. · V. V. Parkar · V. Jha · A. Parmar · Bhushan A. Kanagalekar · B. G. Hegde

    The contribution of one neutron stripping cross section to the total reaction cross section has been studied for Be projectile incident on Tm, Ta, Re and Au targets around Coulomb barrier energy. The measured one neutron stripping cross sections for these systems have been compared with the coupled channel calculations. The recently developed global set of optical model potential parameters for Be projectile has been used in the present calculations. The cumulative of measured complete fusion (CF), incomplete fusion (ICF), one neutron stripping and calculated non-capture breakup (NCBU) cross sections is found to explain almost the reaction cross sections for all the targets. A very small contribution from target inelastic states and elastic breakup may contribute to the remaining part. The percentage fraction of cross section for CF, ICF, one neutron stripping, and NCBU over reaction cross section show the dominance of neutron transfer and NCBU at below barrier energies while CF and ICF processes have the major contribution at above barrier energies.

    nucl-thnucl-exNPA(2023)·9 citations
  4. 04

    Momentum transport of chiral modes in a thermal QCD medium

    Pushpa Panday🇮🇳 · Binoy Krishna Patra🇮🇳

    We have investigated the effect of a weak magnetic field on momentum transport in a thermal QCD medium at finite quark chemical potential using a semiclassical kinetic theory. In the presence of a magnetic field, the momentum transport coefficients acquire a tensor structure, reflected by the five shear and and two bulk viscous components and . The weak magnetic field removes the degeneracy in the effective mass of flavours, leading to different masses for the left-handed (L) and right-handed (R) chiral modes of quarks. The coefficients, and decrease with magnetic field in L mode and increase in mode, whereas, and increase in both L and mode. The bulk viscous coefficients, and increase with magnetic field for both L and R mode. The shear and bulk viscous coefficients positively amplify with baryon asymmetry.

    nucl-thhep-phIJMPE(2024)·5 citations
  5. 05

    Signatures of the isobar in spin observables of electrodisintegration

    A. Deltuva

    The electrodisintegration of is considered focusing on the effects of the isobar excitation which is treated dynamically on the same footing as nucleons. In the region beyond the quasi-elastic peak the predicted transverse response functions and are visibly affected. This leads to sizable isobar effects for inclusive and exclusive electron polarization asymmetries in particular kinematic regions. A measurement performed in the proposed regime could provide judgment for models of nuclear forces and currents.

    nucl-thnucl-exPLB(2022)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE