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Nuclear Theory·nucl-th

Tuesday·July 31, 2018

10 papers—4 primary·6 cross-listed

All10Primary4Cross-lists6
  1. 01

    High Baryon Densities Achieveable at RHIC and LHC

    Joseph I. Kapusta🇺🇸 · Ming Li🇺🇸

    In high energy collisions nuclei are practically transparent to each other but produce very hot, nearly baryon-free, matter in the central rapidity region. Where do the baryons go? We calculate the energy loss of the nuclei using the color glass condensate model. Using a space-time picture of the collision we calculate the baryon and energy densities of the receding baryonic fireballs. For central collisions of large nuclei at RHIC and LHC we find baryon densities more than ten times that of atomic nuclei over a large volume which appear at high rapidities. These results can and are being used as initial conditions for subsequent hydrodynamic evolution and could test the equation of state of matter at very high baryon densities.

    nucl-thNPA(2019)·4 citations
  2. 02

    Generator-coordinate reference states for spectra and decay in the in-medium similarity renormalization group

    J. M. Yao🇺🇸 · J. Engel🇺🇸 · L. J. Wang🇺🇸 · C. F. Jiao🇺🇸 · H. Hergert🇺🇸

    We use a reference state based on symmetry-restored states from deformed mean-field or generator-coordinate-method (GCM) calculations in conjunction with the in-medium similarity-renormalization group (IMSRG) to compute spectra and matrix elements for neutrinoless double-beta () decay. Because the decay involves ground states from two nuclei, we use evolved operators from the IMSRG in one nucleus in a subsequent GCM calculation in the other. We benchmark the resulting IMSRG+GCM method against complete shell-model diagonalization for both the energies of low-lying states in Ca and Ti and the matrix element for the decay of Ca, all in a single valence shell. Our approach produces better spectra than either the IMSRG with a spherical-mean-field reference or GCM calculations with unevolved operators. For the matrix element the improvement is slight, but we expect more significant effects in full ab-initio calculations.

    nucl-thcond-mat.str-elPRC(2018)·77 citations
  3. 03

    The tensor-optimized high-momentum antisymmetrized molecular dynamics with bare interaction and its application in He nucleus

    Mengjiao Lyu · Takayuki Myo · Masahiro Isaka · Hiroshi Toki · Kiyomi Ikeda · Hisashi Horiuchi · Tadahiro Suhara · Taiichi Yamada

    We formulate the "tensor-optimized high-momentum antisymmetrized molecular dynamics (TO-HMAMD)" framework for ab initio calculations of nuclei by hybridizing the tensor-optimized (TO-) and high-momentum (HM-) AMD approaches. This hybrid approach has advantages in both analytical simplicity and numerical efficiency comparing with other AMD-based methods which treat the bare interaction, especially for heavier nuclear systems. In this work, the -shell nucleus He is calculated with TO-HMAMD by including up to double product of nucleon-nucleon () correlations, described by using high-momentum pairs and spatial correlation functions of nucleons. The total energy and radius of He nucleus are well reproduced using the AV8 interaction. The spin-isospin channel dependence is also discussed for -correlations, which are found to be mostly contributed in the even-state channels, especially the triplet-even channel. Analyses of the analytical formation and numerical results suggest that TO-HMAMD could be a promising framework for general nuclear systems.

    nucl-thPRC(2018)·13 citations
  4. 04

    Probing the topological charge in QCD matter via multiplicity up-down asymmetry

    Yifeng Sun🇺🇸 · Che Ming Ko🇺🇸

    Relativistic heavy ion collisions provide the possibility to study the topological charge in QCD matter through the event-by-event fluctuating net axial charge or nonequal numbers of left- and right-handed quarks they generate in the produced quark-gluon plasma. Based on the chiral kinetic approach for nearly massless quarks and antiquarks in the strong vorticity field produced along the normal direction of the reaction plane of non-central heavy ion collisions, we show that a unique signal for the topological charge in QCD matter can be identified from the asymmetric distribution of particles with momenta pointing in the upper and lower hemispheres of the reaction plane as a result of the fluctuating net axial charge.

    nucl-thPLB(2019)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE