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Nuclear Theory·nucl-th

Wednesday·September 2, 2015

14 papers—9 primary·5 cross-listed

All14Primary9Cross-lists5
  1. 10

    Structure of near-threshold quasi-bound states

    Yuki Kamiya🇯🇵 · Tetsuo Hyodo🇯🇵

    We study the compositeness of near-threshold quasi-bound states in the framework of effective field theory. From the viewpoint of the low-energy universality, we revisit the model-independent relations between the structure of the bound state and the observables in the weak binding limit. The effective field theory is utilized to generalize the weak-binding relation of the stable bound states to unstable quasi-bound states with decay modes. We present the interpretation of the complex values of the compositeness for the unstable states. Combining the model-independent relation and the threshold observables extracted from the experimental data, we show that Lambda(1405) is dominated by the Kbar N molecular structure and that a_0(980) is dominated by the non-Kbar K component.

    ↳ hep-phhep-exnucl-thPRC(2016)·74 citations
  2. 11

    Glueballs amass at RHIC and LHC Colliders! - The early quarkless 1st order phase transition at MeV - from pure Yang-Mills glue plasma to GlueBall-Hagedorn states

    Horst Stoecker🇩🇪 · Kai Zhou🇩🇪 · Stefan Schramm🇩🇪 · Florian Senzel🇩🇪 · Carsten Greiner🇩🇪 · Maxim Beitel🇩🇪 · Kai Gallmeister🇩🇪 · Mark Gorenstein🇺🇦 · Igor Mishustin🇩🇪 · David Vasak🇩🇪 · Jan Steinheimer🇩🇪 · Juergen Struckmeier🇩🇪 and 9 other authors

    The early stage of high multiplicity pp, pA and AA collider is represented by a nearly quarkless, hot, deconfined pure gluon plasma. According to pure Yang-Mills Lattice Gauge Theory, this hot pure glue matter undergoes, at a high temperature, MeV, a first order phase transition into a confined Hagedorn-GlueBall fluid. These new scenario should be characterized by a suppression of high photons and dileptons, baryon suppression and enhanced strange meson production. We propose to observe this newly predicted class of events at LHC and RHIC.

    ↳ hep-phnucl-exnucl-thJ.Phys.G(2016)·33 citations
  3. 12

    Fission and spallation data evaluation using induced-activity method

    G. S. Karapetyan

    The induced-activity investigations in off-line analysis performed in different experiments, concerning pre-actinide and actinide nuclei, are here presented and discussed. Generalized expressions for the determination of independent yields/cross sections of radioactive nuclei, formed in the targets, are derived and analysed. The fragment mass distribution from U-238, Th-232 and Ta-181 photofission at the bremsstrahlung end-point energies of 50 and 3500 MeV, and from Am-241, U-238 and Np-237 fission induced by 660-MeV protons, are scrutinized from the point of view of the multimodal fission approach. The results of these studies are hence compared with theoretical model calculations using the CRISP code. We subsequently discuss the complex particle-induced reaction, such as heavy-ions and deuterons, by using the thick-target thick-catcher technique and the two-step vector model framework as well. This is accomplished in order to present the investigation of the main processes (fission, spallation and (multi)fragmentation) in intermediate- and high-energy ranges of the incident particle. The set of experimental data, presented in this work, encompasses not merely the data as total production cross sections. Notwithstanding, it further covers other data, as individual yields/cross sections, charge, mass and spin distributions of the reaction fragments, as well as kinematic features. These sources of experimental data can serve as a consistent set of benchmarking data, still necessary for the study of heavy nuclei. Besides, it is also useful for technological applications, from astrophysics and environmental sciences to accelerator technology and accelerator-based nuclear waste transmutation and energy amplification as well.

    ↳ nucl-exnucl-thEur.Phys.J.Plus(2015)·13 citations
  4. 13

    Inhomogeneous Thermal Quenches

    Kiyoumars A. Sohrabi🇨🇭

    We describe holographic thermal quenches that are inhomogeneous in space. The main characteristic of the quench is to take the system far from its equilibrium configuration. Except special extreme cases, the problem has no analytic solution. Using the numerical holography methods, we study different observables that measure thermalization such as the time evolution of the apparent horizon, two-point Wightman function and entanglement entropy (EE). Having an extra nontrivial spacial direction, allows us to study this peculiar generalization since we categorize the problem based on whether we do the measurements along this special direction or perpendicular to it. Exciting new features appear that are absent in the common computations in the literature; the appearance of negative EE valleys surrounding the positive EE hills and abrupt quenches that occupy the whole space at their universal limit are some of the results of this paper. Physical explanation is given and connections to the Cardy's idea of thermalization are discussed.

    ↳ hep-thgr-qchep-lathep-ph+1PRD(2017)·6 citations
  5. 14

    Color confinement from fluctuating topology

    Dmitri E. Kharzeev🇺🇸

    QCD possesses a compact gauge group, and this implies a non-trivial topological structure of the vacuum. In this contribution to the Gribov-85 Memorial volume, we first discuss the origin of Gribov copies and their interpretation in terms of fluctuating topology in the QCD vacuum. We then describe the recent work with E. Levin that links the confinement of gluons and color screening to the fluctuating topology, and discuss implications for spin physics, high energy scattering, and the physics of quark-gluon plasma.

    ↳ hep-phhep-thnucl-thInt.J.Mod.Phys.A(2016)·6 citations

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