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Nuclear Theory·nucl-th

Monday·July 9, 2018

4 papers—4 primary·0 cross-listed

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  1. 01

    System stability and truncation schemes to the Dyson-Schwinger Equations

    Bin Wang🇨🇳

    With decades of years development, although important progresses have been made by the pioneers of this field, providing a sophisticated truncation scheme is still a great challenge up to now if the Dyson-Schwinger Equations(DSEs) of both quark and gluon propagators (or including even more DSEs) remain after truncation. In this work we view the coupled reminiscent DSEs of the gluon and quark propagators after truncation as a system with feedback. Then studying the stability of this equation array gives useful results. Our calculation shows that the sum of the gluon and ghost loops plays the most important role in keeping this system stable and having reasonable solutions. The quark-gluon vertex plays a relative smaller but also important role. Our method also could give constraints and inspirations on fabricating a more sophisticated model of the quark-gluon vertex.

    nucl-th1 citation
  2. 02

    Neutrino-nucleus reactions on O based on new shell-model Hamiltonians

    Toshio Suzuki🇯🇵 · Satoshi Chiba🇯🇵 · Takashi Yoshida🇯🇵 · Koh Takahashi🇩🇪 · Hideyuki Umeda🇯🇵

    Neutrino-induced reactions on O are investigated by shell-model calculaions with new shell-model Hamiltonians, which can describe well the structure of -shell and - shell nuclei. Distribution of the spin-dipole strengths in O, which give major contributions to the -O reaction cross sections, is studied with the new Hamiltonians. Muon-capture reaction rates on O are also studied to discuss the quenching of the axial-vector coupling in nuclear medium. Charged-current and neutral-current reaction cross sections are evaluated in various particle and emission channels as well as the total ones at neutrino energies up to 100 MeV. Branching ratios for the various channels are obtained by the Hauser-Feshbach statistical model calculations, and partial cross sections for single- and multi-particle emission channels are evaluated. The cross sections updated are compared with previous continuum random phase approximation (CRPA) calculations. Effects of multi-particle emission channels on nucleosynthesis in core-collapse supernova (SN) explosions are investigated. Inclusion of p emission channels is found to lead to an enhancement of production yields of B and C through O (, ' p) B and O (, e p) C reactions, respectively.

    nucl-thPRC(2018)·33 citations
  3. 03

    Latest predictions from the EbyE NLO EKRT model

    Harri Niemi🇫🇮 · Kari J. Eskola🇫🇮 · Risto Paatelainen🇫🇮 · Kimmo Tuominen🇫🇮

    We present the latest results from the NLO pQCD + saturation + viscous hydrodynamics (EbyE NLO EKRT) model. The parameters in the EKRT saturation model are fixed by the charged hadron multiplicity in the 0-5 \% 2.76 TeV Pb+Pb collisions. The , and centrality dependence of the initial particle production follows then from the QCD dynamics of the model. This allows us to predict the and dependence of the particle production. We show that our results are in an excellent agreement with the low- data from 2.76 TeV and 5.02 TeV Pb+Pb collisions at the LHC as well as with the data from the 200 GeV Au+Au collisions at RHIC. In particular, we study the centrality dependences of hadronic multiplicities, flow coefficients, and various flow correlations. Furthermore, the nuclear mass number dependence of the initial particle production and hydrodynamic evolution can be tested in the 5.44 TeV Xe+Xe collisions at the LHC. To this end, we show our predictions for charged particle multiplicities, and in particular, show how the deformations of the Xe nuclei reflect into the flow coefficients.

    nucl-thhep-phNPA(2019)·5 citations
  4. 04

    Side-Jump Induced Spin-Orbit Interaction of Chiral Fluids from Kinetic Theory

    Di-Lun Yang🇯🇵

    We apply the Wigner-function approach and chiral kinetic theory to investigate the angular momentum and polarization of chiral fluids composed of Weyl fermions with background electric/magnetic fields and vorticity. It is found that the quantum corrections in Wigner functions give rise to nonzero anti-symmetric components in the canonical energy-momentum tensors, which are responsible for the spin-orbit interaction. In global equilibrium, conservation of the canonical angular momentum reveals the cancellation between the orbital component stemming from side jumps with nonzero vorticity and the spin component in the presence of an axial chemical potential. We further analyze the conservation laws near local equilibrium. It turns out that the canonical angular momentum is no longer conserved even in the absence of background fields due to the presence of a local torque coming from the spin-orbit interaction involving temperature/chemical-potential gradients, which is implicitly led by collisions.

    nucl-thcond-mat.mes-hallhep-thPRD(2018)·57 citations

Affiliations

first authorsco-authorsvia INSPIRE