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Nuclear Theory·nucl-th

Thursday·July 30, 2015

10 papers—3 primary·7 cross-listed

All10Primary3Cross-lists7
  1. 01

    [Submitted on 29 Jul 2015]

    Nuclear shape coexistence in Po isotopes: An interacting boson model study

    J.E. Garcia-Ramos · K. Heyde

    Background: The lead region, Po, Pb, Hg, and Pt, shows up the presence of coexisting structures having different deformation and corresponding to different particle-hole configurations in the Shell Model language. Purpose: We intend to study the importance of configuration mixing in the understanding of the nuclear structure of even-even Po isotopes, where the shape coexistence phenomena are not clear enough. Method: We study in detail a long chain of polonium isotopes, 190-208Po, using the interacting boson model with configuration mixing (IBM-CM). We fix the parameters of the Hamiltonians through a least-squares fit to the known energies and absolute B(E2) transition rates of states up to 3 MeV. Results: We obtained the IBM-CM Hamiltonians and we calculate excitation energies, B(E2)'s, electric quadrupole moments, nuclear radii and isotopic shifts, quadrupole shape invariants, wave functions, and deformations. Conclusions: We obtain a good agreement with the experimental data for all the studied observables and we conclude that shape coexistence phenomenon is hidden in Po isotopes, very much as in the case of the Pt isotopes.

    Comments:
    To be published in Physical Review C. arXiv admin note: text overlap with arXiv:1312.4595
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1507.08035 [pdf]
    PRC(2015)·36 citations
  2. 02

    [Submitted on 29 Jul 2015]

    Why we need an Electron-Ion Collider

    Raju Venugopalan (BNL)🇺🇸

    We present a brief argument making the science case for an electron-ion collider.

    Comments:
    small typos corrected, 6 pages, contribution to appear in a special issue of Annalen Der Physik titled "Particle Physics after the Higgs", Guest Editors: H. Abramowicz, A. Caldwell, B. Foster
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex)
    arXiv:
    1507.08128 [pdf]
    Annalen Phys.(2016)·4 citations
  3. 03

    [Submitted on 29 Jul 2015]

    Rapidity dependence in holographic heavy ion collisions

    Wilke van der Schee🇺🇸 · Bjoern Schenke🇺🇸

    We present an attempt to closely mimic the initial stage of heavy ion collisions within holography, assuming a decoupling of longitudinal and transverse dynamics in the very early stage. We subsequently evolve the obtained initial state using state-of-the-art hydrodynamic simulations, and compare results to experimental data. We present results for charged hadron pseudo-rapidity spectra and directed and elliptic flow as functions of pseudo-rapidity for Au-Au and Pb-Pb collisions. The directed flow interestingly turns out to be quite sensitive to the viscosity. The results can explain qualitative features of the collisions, but the rapidity spectra in our current model is narrower than the experimental data.

    Comments:
    5 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Theory (hep-th)
    arXiv:
    1507.08195 [pdf]
    PRC(2015)·35 citations

Affiliations

first authorsco-authorsvia INSPIRE