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Nuclear Theory·nucl-th

Friday·November 20, 2015

6 papers—4 primary·2 cross-listed

All6Primary4Cross-lists2
  1. 01

    Velocity fluctuations of fission fragments

    Felipe J. Llanes-Estrada · Belen Martinez Carmona · Jose L. Muñoz Martinez

    We propose event by event velocity fluctuations of nuclear fission fragments as an additional interesting observable that gives access to the nuclear temperature in an independent way from spectral measurements and relates the diffusion and friction coefficients for the relative fragment coordinate in Kramer-like models (in which some aspects of fission can be understood as the diffusion of a collective variable through a potential barrier). We point out that neutron emission by the heavy fragments can be treated in effective theory if corrections to the velocity distribution are needed.

    nucl-thIJMPE(2016)·0 citations
  2. 02

    Shape coexistence in the microscopically guided interacting boson model

    K. Nomura🇫🇷 · T. Otsuka · P. Van Isacker🇫🇷

    Shape coexistence has been a subject of great interest in nuclear physics for many decades. In the context of the nuclear shell model, intruder excitations may give rise to remarkably low-lying excited states associated with different intrinsic shapes. In heavy open-shell nuclei, the dimension of the shell-model configuration space that includes such intruder excitations becomes exceedingly large, thus requiring a drastic truncation scheme. Such a framework has been provided by the interacting boson model (IBM). In this article we address the phenomenon of shape coexistence and its relevant spectroscopy from the point of view of the IBM. A special focus is placed on the method developed recently which makes use of the link between the IBM and the self-consistent mean-field approach based on the nuclear energy density functional. The method is extended to deal with various intruder configurations associated with different equilibrium shapes. We assess the predictive power of the method and suggest possible improvements and extensions, by considering illustrative examples in the neutron-deficient Pb region, where shape coexistence has been experimentally studied.

    nucl-thnucl-exJ.Phys.G(2016)·49 citations
  3. 03

    Algebraic vacuum limits of QCD condensates from in-medium projections of Lorentz tensors

    Thomas Buchheim🇩🇪 · Burkhard Kampfer🇩🇪 · Thomas Hilger🇦🇹

    Utilizing the in-medium Lorentz decomposition of operators generating QCD condensates we derive general constraints among the latter ones by the requirement of a smooth transition from medium to vacuum. In this way we relate the vacuum limits of heretofore unrelated condensates and provide consistency checks for the vacuum saturation hypothesis and the heavy quark mass expansion. The results are general and depend only on the rank and symmetry of the Lorentz tensors to be decomposed. The derived prescription enables to uniquely and directly identify operator product expansion contributions which are algebraically specific for in-medium situations and in particular useful for operators with a higher rank, i.e. larger than three. Four-quark condensates in mass dimension six are exemplified.

    nucl-thhep-phJ.Phys.G(2016)·12 citations
  4. 04

    Hydrodynamic predictions for 5.02 TeV Pb-Pb collisions

    Jacquelyn Noronha-Hostler (Columbia U.)🇺🇸 · Matthew Luzum (Sao Paulo U. & Santiago de Compostela U.)🇪🇸 · Jean-Yves Ollitrault (IPhT, Saclay)🇫🇷

    We make predictions for momentum-integrated elliptic and triangular flow as well as mean transverse momentum for 5.02 TeV Pb-Pb collisions, as planned at the Large Hadron Collider. We use hydrodynamic calculations to predict the change of these observables as the center-of-mass collision energy evolves from 2.76 TeV to 5.02 TeV per nucleon pair. By using previously measured values as a baseline, we are able to make a robust prediction without relying on a particular model for initial conditions and without precise knowledge of medium properties such as viscosity. Thus, though the predicted changes are small, they can provide a significant test of the current hydrodynamic picture of heavy-ion collisions.

    nucl-thhep-phPRC(2016)·93 citations

Affiliations

first authorsco-authorsvia INSPIRE