s'authentifier
version française rss feed
HAL : in2p3-00186434, version 1

Fiche concise  Récupérer au format
Halo phenomenon in finite many-fermion systems: Atom-positron complexes and large-scale study of atomic nuclei
Rotival V., Bennaceur K., Duguet T.
Physical Review C 79 (2009) 054309 - http://hal.in2p3.fr/in2p3-00186434
Physique/Physique Nucléaire Théorique
Halo phenomenon in finite many-fermion systems: Atom-positron complexes and large-scale study of atomic nuclei
V. Rotival1, 2, K. Bennaceur3, 4, T. Duguet1
1 :  NSCL, MSU - National Superconducting Cyclotron Laboratory, Michigan State University
National Superconducting Cyclotron Laboratory – Michigan State University
États-Unis
2 :  DPTA - Département de Physique Théorique et Appliquée
CEA : DAM/DIF
CEA Bruyères le Châtel DAM/DIF/DPTA 91297 Arpajon
France
3 :  IPNL - Institut de Physique Nucléaire de Lyon
http://www.ipnl.in2p3.fr/
CNRS : UMR5822 – IN2P3 – Université Claude Bernard - Lyon I
France
4 :  SPhN - Service de Physique Nucléaire
CEA : DSM/IRFU
France
The analysis method proposed in [V. Rotival and T. Duguet, nucl-th/0702050] is applied to characterize halo properties in finite quantum systems. First, the model independence of the method is highlighted by applying it to the results of many-body calculations of light and medium-mass nuclei as well as of atom-positron complexes. Second, the dependence of halo properties on the characteristics of the nuclear energy density functional used is studied through self-consistent Hartree-Fock-Bogoliubov calculations. It is found that (a) the low-density behavior of the pairing functional and the regularization/renormalization scheme must be chosen coherently to be physically sound (b) the overall impact of pairing correlations on halo properties is very significant and is the result of two competing effects (c) however, the detailed characteristics of the pairing functional has only little importance (d) halos properties depend significantly on the ingredients of the energy density functional that influence the location of single-particle levels; i.e. effective mass, tensor terms, saturation energy. Last but not least, large scale predictions of halos among all spherical even-even nuclei are performed using specific sets of particle-hole and particle-particle energy functionals. It is shown that halos in the ground state of medium-mass nuclei might only be found at the very limit of neutron stability for a limited number of elements.

Articles dans des revues avec comité de lecture
2009
Physical Review C (Phys. Rev. C)
Publisher American Physical Society
ISSN 0556-2813 (eISSN : 1089-490X)
79
054309

21.10.-k, 2.10.Gv, 21.10.Pc, 21.30.Fe, 21.60.Jz, 21.65.+f
32 Pages, 42 Figures. To be submitted to Phys. Rev. C back-to back with first part (nucl-th/0702050)
halo – EDF – HFB – pairing
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/0711.1275