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Nuclear Theory·nucl-th

Thursday·September 15, 2022

6 papers—2 primary·4 cross-listed

All6Primary2Cross-lists4
  1. 03

    Ridge from jet-medium interaction in p-Pb collisions at = 5.02 TeV

    Debojit Sarkar🇮🇳 · Subhasis Chattopadhyay🇮🇳

    In this paper we report the effect of the jet-medium interplay as implemented in EPOS 3 on the ridge like structure observed in high multiplicity p-Pb collisions at 5.02 TeV. EPOS 3 takes into account hydrodynamically expanding bulk matter, jets and the jet-medium interaction. The basis of this model is multiple scatterings where each scattering finally produces flux tube / string. In the higher multiplicity event classes where the flux tube/string density is higher, there is a finite probability that the strings will pick up quarks and antiquarks (or diquarks) from the bulk (core) for flux tube breaking to produce jet hadrons (corona) instead of producing them via usual Schwinger mechanism. This will eventually create a correlation between core and corona and also influence the corona-corona correlation as the corona particles containing quarks and antiquarks (or diquarks) from the bulk also carry the fluid information. We report the relative contributions of the core-core, core-corona, corona-core and corona-corona correlations towards the ridge in the high and low multiplicity p-Pb collisions at 5.02 TeV using the data generated by EPOS 3. The multiplicity evolution of the ridges in all the cases is also reported.

    ↳ hep-phhep-exnucl-thPRC(2017)·5 citations
  2. 04

    E2 Rotational Invariants of and states for Cd: the Emergence of Collective Rotation

    T. J. Gray🇺🇸 · J. M. Allmond🇺🇸 · R. V. F. Janssens🇺🇸 · W. Korten🇫🇷 · A. E. Stuchbery🇦🇺 · J. L. Wood🇺🇸 · A. D. Ayangeakaa🇺🇸 · S. Bottoni🇺🇸 · B. M. Bucher🇺🇸 · C. M. Campbell🇺🇸 · M. P. Carpenter🇺🇸 · H. L. Crawford🇺🇸 and 20 other authors

    The collective structure of Cd is elucidated by multi-step Coulomb excitation of a 3.849 MeV/ beam of Cd on a 1.1 mg/cm Pb target using GRETINA-CHICO2 at ATLAS. Fourteen matrix elements were obtained. The nucleus Cd is a prime example of emergent collectivity that possesses a simple structure: it is free of complexity caused by shape coexistence and has a small, but collectively active number of valence nucleons. This work follows in a long and currently active quest to answer the fundamental question of the origin of nuclear collectivity and deformation, notably in the cadmium isotopes. The results are discussed in terms of phenomenological models, the shell model, and Kumar-Cline sums of matrix elements. The matrix element is determined for the first time, providing a total, converged measure of the electric quadrupole strength, , of the first-excited level relative to the ground state, which does not show an increase as expected of harmonic and anharmonic vibrations. Strong evidence for triaxial shapes in weakly collective nuclei is indicated; collective vibrations are excluded. This is contrary to the only other cadmium result of this kind in Cd by C. Fahlander et al., Nucl. Phys. A485, 327 (1988), which is complicated by low-lying shape coexistence near midshell.

    ↳ nucl-exnucl-thPLB(2022)·9 citations
  3. 05

    Compact Star Twins with a Dark Matter Core

    David Alvarez-Castillo🇵🇱 · Michał Marczenko🇵🇱

    We present a model of compact stars with a dark matter core. The hadronic equation of state is based on the parity doublet model and does not present a phase transition to quark matter. Instead, a strong first-order phase transition to dark matter described by a constant speed of sound model leads to the scenario of compact star mass twins. Compact star structural properties which obey state-of-the-art measurements and constraints are presented.

    ↳ astro-ph.HEnucl-thActa Phys.Polon.Supp.(2022)·1 citation
  4. 06

    Constrained instanton approximation of Skyrmions with massive pions

    Alberto García Martín-Caro🇪🇸

    We present the idea of using the holonomy along a line of a constrained instanton solution (an approximate solution of the Euclidean equations of motion subject to a constraint) of an Yang-Mills-Higgs theory to approximate the Skyrmion solution in a chiral model with massive pions. The fact that the gauge field acquires a nonzero mass due to the Higgs mechanism implies that a constrained instanton decays exponentially far from its center, and so does the Skyrmion configuration that it generates via the Atiyah-Manton construction. This is precisely the desired behavior at large distances for the true Skyrmion solutions when the pion mass is included.

    ↳ hep-thnucl-thPLB(2022)·3 citations

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