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Nuclear Theory·nucl-th

Tuesday·March 16, 2021

13 papers—6 primary·7 cross-listed

All13Primary6Cross-lists7
  1. 01

    Novel Relaxation Time Approximation to the Relativistic Boltzmann Equation

    Gabriel S. Rocha🇧🇷 · Gabriel S. Denicol🇧🇷 · Jorge Noronha🇺🇸

    We show that the widely used relaxation time approximation to the relativistic Boltzmann equation contains basic flaws, being incompatible with microscopic and macroscopic conservation laws. We propose a new approximation that fixes such fundamental issues and maintains the basic properties of the linearized Boltzmann collision operator. We show how this correction affects transport coefficients, such as the bulk viscosity and particle diffusion.

    nucl-thhep-phhep-thPRL(2021)·107 citations
  2. 02

    Predictive power for superheavy nuclear mass and possible stability beyond the neutron drip line in deformed relativistic Hartree-Bogoliubov theory in continuum

    Kaiyuan Zhang🇨🇳 · Xiaotao He🇨🇳 · Jie Meng🇨🇳 · Cong Pan🇨🇳 · Caiwan Shen🇨🇳 · Chen Wang🇨🇳 · Shuangquan Zhang🇨🇳

    The predictive power of the deformed relativistic Hartree-Bogoliubov theory in continuum (DRHBc) for nuclear mass is examined in the superheavy region, . The accuracy of predicting the 10 (56) measured (measured and empirical) masses is () MeV, in comparison with () MeV by WS4 and () MeV by FRDM. Possible stability against multineutron emission beyond the two-neutron drip line is explored by the DRHBc theory, which takes into account simultaneously the deformation effects, the pairing correlations, and the continuum effects. Nuclei stable against two- and multineutron emissions beyond the two-neutron drip line are predicted in Sg, Hs, Ds, and Cn isotopic chains, forming a peninsula of stability adjacent to the nuclear mainland. This stability is mainly due to the deformation which significantly affects the shell structure around the Fermi surface. The pairing correlations and continuum influence the stability peninsula in a self-consistent way.

    nucl-thPRC(2021)·63 citations
  3. 03

    The effect of single-particle space-momentum angle distribution on two-pion HBT correlation in relativistic heavy-ion collisions by using a multiphase transport model

    Hang Yang🇨🇳 · Qichun Feng🇨🇳 · Yanyv Ren🇨🇳 · Jingbo Zhang🇨🇳 · Lei Huo🇨🇳

    With the string melting version of a multiphase transport(AMPT) model, we analyze the transverse momentum dependence of HBT radius and the single-pion transverse angle distribution in central Au+Au collisions at GeV. And base on a series of functions, a numerical connection between these two phenomena has been built. We can estimate the single-pion transverse angle distribution from the HBT analysis.

    nucl-thCPC(2021)·5 citations
  4. 04

    A polynomial in transverse momentum manifesting thermalisation in nuclear collisions

    Rahul Ramachandran Nair🇵🇱

    A specific value of light front variable of the inclusively produced hadrons in a relativistic nuclear collision is constructed as a polynomial in transverse momentum of the particle within the UrQMD transport model. It is shown that those particles with the absolute value of their light front variable greater than the corresponding follow a Fermi-Dirac or Bose-Einstein distribution depending upon the spin of the particle.

    nucl-thhep-ph2 citations
  5. 05

    S-shell hypernuclei based on chiral interactions

    Hoai Le🇩🇪 · Johann Haidenbauer🇩🇪 · Ulf-G Meißner🇩🇪 · Andreas Nogga🇩🇪

    We generalize the Jacobi no-core shell model (J-NCSM) to study double-strangeness hypernuclei. All particle conversions in the strangeness sectors are explicitly taken into account. In two-body space, such transitions may lead to the coupling between states of identical particles and of non-identical ones. Therefore, a careful consideration is required when determining the combinatorial factors that connect the many-body potential matrix elements and the free-space two-body potentials. Using second quantization, we systematically derive the combinatorial factors in question for sectors. As a first application, we use the J-NCSM to investigate s-shell hypernuclei based on hyperon-hyperon (YY) potentials derived within chiral effective field theory at leading order (LO) and up to next-to-leading order (NLO). We find that the LO potential overbinds while the prediction of the NLO interaction is close to experiment. Both interactions also yield a bound state for . The system is predicted to be unbound.

    nucl-thEPJA(2021)·16 citations
  6. 06

    Analysis of the Pion-Nucleus Scattering within the Folding and the Kisslinger Type Potentials

    V.K. Lukyanov🇷🇺 · E.V. Zemlyanaya🇷🇺 · K.V. Lukyanov🇷🇺 · I. Abdul-Magead🇷🇺

    Elastic cross sections are calculated and compared with the data on scattering on Si, Ca, Ni, Pb nuclei in the energy range from 130 to 290 MeV. To this end, both the folding optical potential (OP) and the local modified Kisslinger-type OP were calculated, and then the cross sections were obtained by solving the Klein-Gordon equation to account for the relativization and distortion wave effects. In the folding OPs, the parameters of the elementary amplitude were fitted when describing the scattering data, and thus the essential in-medium effect on the parameters of the amplitude was established since the pion is scattered not on a free but on a bound nuclear nucleon. Fairly good agreement with experimental data was obtained for both models of optical potentials and their forms turn out to be in coincidence in the region of their surfaces.

    nucl-thNPA(2021)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE