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Nuclear Theory·nucl-th

Thursday·October 29, 2015

10 papers—6 primary·4 cross-listed

All10Primary6Cross-lists4
  1. 01

    Current status of dynamical modeling of fluctuations at the QCD phase transition in heavy-ion collisions

    Marlene Nahrgang🇺🇸

    For a complete understanding of the QCD phase diagram it is important to connect first-principle thermodynamic calculations to experimental data from the RHIC Beam Energy Scan and the future experimental facilities FAIR, GSI, and NICA, Dubna. This can only be achieved by a realistic modeling of the dynamical evolution of critical fluctuations in heavy-ion collisions at the QCD phase transition. In this note I will summarize the current status of these dynamical models and highlight some of the important issues, which need to be addressed in the future.

    nucl-thhep-phPoS(2015)·7 citations
  2. 02

    Fluctuations of flow harmonics in Pb+Pb collisions at ~TeV from the Glauber model

    Maciej Rybczynski🇵🇱 · Wojciech Broniowski🇵🇱

    In the framework of the Glauber model as implemented in GLISSANDO 2, we study the fluctuations of flow harmonics in Pb+Pb collisions at the LHC centre-of-mass energy of 2.76 TeV. The model with wounded nucleons and the admixture of binary collisions leads to reasonable agreement for the ellipticity and triangularity fluctuations with the experimental data from the ATLAS, ALICE, and CMS collaborations, verifying the assumption that the initial eccentricity is approximately proportional to the harmonic flow of charged particles. While the agreement, in particular at the level of event-by-event distributions of eccentricities/flow coefficients in not perfect, it leads to a fair (at the level of a few percent for all centralities except the most peripheral collisions) description of the scaled standard deviation and the F measure which involve the four-particle cumulants. We also discuss the case of quadrangular flow. Computer scripts that generate our results from the GLISSANDO 2 simulations are provided.

    nucl-thhep-phnucl-exActa Phys.Polon.B(2016)·10 citations
  3. 03

    Competing -rigid and -stable vibrations in neutron rich Gd and Dy isotopes

    R. Budaca · A. I. Budaca

    An exactly separable version of the Bohr Hamiltonian which combines the -stable and -rigid axial vibration-rotation is used to describe the collective properties of few neutron rich transitional nuclei. The coupling between the two types of collective motion is managed through a rigidity parameter which also influences the geometry of the shape-phase space. While the -angular part of the problem associated to axially symmetric shapes is treated within the small angles approximation and the stiff oscillation hypothesis, the vibration is described by means of a Davidson potential. The resulting model have three free parameters not counting the scale and was successfully applied for the description of the collective spectra for few heavier isotopes of Gd and Dy. In both cases a critical nucleus was identified through a discontinuous behavior in respect to the rigidity parameter and relevant experimental observables.

    nucl-thEPJA(2015)·11 citations
  4. 04

    Resonance Extraction from the SAID Analysis

    Ron Workman · Alfred Svarc

    Resonances are extracted from a number of energy-dependent and single-energy fits to scattering data. The influence of recent, precise EPECUR data is investigated. Results for the single-energy fits are derived using the L+P method of analysis and are compared to those obtained using contour integration applied to the global energy-dependent fits.

    nucl-thAIP Conf.Proc.(2016)·0 citations
  5. 05

    Properties of superheavy nuclei with Z = 124

    M. S. Mehta · Harvinder Kaur · Bharat Kumar · S. K. Patra

    We employ Relativistic Mean Field (RMF) model with NL3 parametrization to investigate the ground state properties of superheavy nucleus, Z = 124. The nuclei selected (from among complete isotopic series) for detailed investigation show that the nucleon density at the center is very low and therefore, these nuclei can be treated as semi-bubble nuclei. The considerable shell gap appears at neutron numbers N = 172, 184 and 198 showing the magicity corresponding to these numbers. The results are compared with the macro-microscopic Finite Range Droplet Model (FRDM) wherever possible.

    nucl-thPRC(2015)·21 citations
  6. 06

    Rotating nuclei: from ground state to the extremes of spin and deformation

    A. V. Afanasjev

    The rotating nuclei represent one of most interesting subjects for theoretical and experimental studies. They open a new dimension of nuclear landscape, namely, spin direction. Contrary to the majority of nuclear systems, their properties sensitively depend on time-odd mean fields and currents in density functional theories. Moreover, they show a considerable interplay of collective and single-particle degrees of freedom. In this chapter, I discuss the basic features of the description of rotating nuclei in one-dimensional cranking approximation of covariant density functional theory. The successes of this approach to the description of rotating nuclei at low spin in pairing regime and at high spin in unpaired regime in wide range of deformations (from normal to hyperdeformation) are illustrated. I also discuss the recent progress and open questions in our understanding of the role of proton-neutron pairing in rotating nuclei at , the physics of band termination and other phenomena in rotating nuclei.

    nucl-thInt.Rev.Nucl.Phys.(2016)·9 citations

Affiliations

first authorsco-authorsvia INSPIRE