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Nuclear Theory·nucl-th

Thursday·May 14, 2015

4 papers—3 primary·1 cross-listed

All4Primary3Cross-lists1
  1. 01

    Swelling of nuclei embedded in neutron-gas and consequences for fusion

    A.S. Umar · V.E. Oberacker · C. J. Horowitz · P.-G. Reinhard · J.A. Maruhn

    Fusion of very neutron rich nuclei may be important to determine the composition and heating of the crust of accreting neutron stars. We present an exploratory study of the effect of the neutron-gas environment on the structure of nuclei and the consequences for pycnonuclear fusion cross-sections in the neutron drip region. We studied the formation and properties of Oxygen and Calcium isotopes embedded in varying neutron-gas densities. We observe that the formed isotope is the drip-line nucleus for the given effective interaction. Increasing the neutron-gas density leads to the swelling of the nuclear density. We have used these densities to study the effect of this swelling on the fusion cross-sections using the São-Paulo potential. At high neutron-gas densities the cross-section is substantially increased but at lower densities the modification is minimal.

    nucl-thPRC(2015)·6 citations
  2. 02

    Microscopic description of large amplitude collective motion in the nuclear astrophysics context

    Denis Lacroix · Yusuke Tanimura · Guillaume Scamps · Cédric Simenel

    In the last 10 years, we have observed an important increase of interest in the application of time-dependent energy density functional theory (TD-EDF). This approach allows to treat nuclear structure and nuclear reaction from small to large amplitude dynamics in a unified framework. The possibility to perform unrestricted three-dimensional simulations using state of the art effective interactions has opened new perspectives. In the present article, an overview of applications where the predictive power of TD-EDF has been benchmarked is given. A special emphasize is made on processes that are of astrophysical interest. Illustrations discussed here include giant resonances, fission, binary and ternary collisions leading to fusion, transfer and deep inelastic processes.

    nucl-thastro-ph.SRnucl-exIJMPE(2015)·4 citations
  3. 03

    Symmetry conserving configuration mixing method with cranked states

    Marta Borrajo · Tomás R. Rodríguez · J. Luis Egido

    We present the first calculations of a symmetry conserving configuration mixing method (SCCM) using time-reversal symmetry breaking Hartree-Fock-Bogoliubov (HFB) states with the Gogny D1S interaction. The method includes particle number and tridimensional angular momentum symmetry restorations as well as configuration mixing within the generator coordinate method (GCM) framework. The nucleus Mg is chosen to show the performance and reliability of the calculations. Additionally, , and states are computed for the magnesium isotopic chain, where a noticeable compression of the spectrum is obtained by including cranked states, leading to a very good agreement with the known experimental data.

    nucl-thPLB(2015)·73 citations
  4. 04

    Evidence for a new symmetry with mesons

    M. Denissenya🇦🇹 · L.Ya. Glozman🇦🇹 · M. Pak🇦🇹

    Recently, a new symmetry of mesons has been found upon truncation of the quasi-zero modes of the Overlap Dirac operator in lattice simulations. Namely, the and possibly mesons get degenerate after removal of the quasi-zero modes. This emergent symmetry has been established to be . It is higher than the symmetry of the QCD Lagrangian and provides not only a mixing of quarks of given chirality in the isospin space, but also the mixing of left-handed and right-handed components. Here we study, with the Overlap Dirac operator, the isovector mesons upon the quasi-zero mode reduction and observe a similar degeneracy. This result further supports the symmetry in mesons of given spin .

    ↳ hep-lathep-phnucl-thPRD(2015)·44 citations

Affiliations

first authorsco-authorsvia INSPIRE