Nuclear Theory at Institut de Physique Nuclaire, Orsay

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Nuclear Theory at Institut de Physique Nucléaire,
Orsay
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University Paris-Sud (Paris-XI)

• The StudentsNearly 30,000 students - 43
  enrolled in general education courses and 57 in
  professional training courses. - 5,700 are
  following DUT, Professional degrees, IUP, MST,
  DESS, Masters degrees and engineering courses.
  - 3,100 enrolled in one of the 19 PhD schools, 16
  of which are in the heart of the Université
  Paris-Sud 11 - 3,200 are foreign students from
  130 different countries - 3,200 are carrying out
  internships as part of continuous education
  programmes or apprenticeships..The Staff -
  1,800 teaching staff, 1,200 research scientists
  - 1,300 engineers, technicians, administrative
  staff and maintenance staff - 900 technical and
  administrative staff of the national research
  organisations CNRS, INSERM, INRA, CEA - 81
  library staff

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• A large budgetAnnual consolidated budget of 450
  million Euros 81 million Euros as part of a
  four-year development contract (2002-2005) 11
  million Euros of research contracts 2,5 million
  Euros of apprenticeship tax 8 million Euros for
  adult education

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The Orsay campus

• 25 km S-W of Paris
• 25 mn by train or motorway
• Area of more than 2 square kilometers
• Science and Technology campus biology,
  chemistry, electronics, computer science,
  mechanics, mathematics, physics, Earth sciences,
  sports
• 13,000 enrolled students including 2,100 PhDs,
  1,700 faculty and research staff, 60 institutes
  and labs.

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The Theory Group

• 17 permanent staff (faculty and CNRS researchers)
• 4 PhD students (very small number)
• Steady flux of visitors
• 2 main fields of research
  
• - Particle physics and field theory
• - Nuclear structure and fermionic systems

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Particle physics and field theory

• Effective field theory
• Chiral perturbation theory
• Low energy QCD
• Symmetry breaking
• Variational methods in field theory
• Relativistic spectroscopy
• Quantum Hall effect, Chern-Simons theory

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Nuclear structure and fermionic systems

• Non-relativistic mean field methods
  Hartree-Fock-Bogoliubov and quasiparticle RPA
• Relativistic mean field methods relativistic
  Hartree-Fock (RHF) relativistic RPA (RRPA)
• Unstable nuclei ground states and excitations.
• Large amplitude collective motion by GCM
• Structure and reactions involving halo nuclei
• Trapped fermionic atoms
• Structure and reactions in inner crust of neutron
  stars
• Neutrino interaction with nuclei and matter
• Self-consistent RPA and Renormalized RPA

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1. Pairing correlations in nuclear ground states
The Hartree-Fock-Bogoliubov Equations
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Hartree-Fock field and pairing field
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Quasiparticle continuum
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Treatment of quasiparticle continuum
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illustration Ni isotopes
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The generalized Bethe-Salpeter equation for QRPA
Greens Function
2. Pairing correlations in excited states
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External field and Strength distribution
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2 states in 120Sn, with smearing
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3. Inner crust of neutron stars
E. Khan, N. Sandulescu Nguyen Van Giai
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Elementary cells
Wigner-Seitz cell
Elementary cell
Lattice
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Density in the Wigner-Seitz Cells
N.Sandulescu, Nguyen Van Giai,R.J.Liotta,
Phys.Rev.C69(2004)045802
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Pairing Field in the Wigner-Seitz Cells
N.Sandulescu, Phys.Rev.C70 (2004) 025801
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Supergiant resonances in Wigner-Seitz cell
L1
Z50 N1750
L0
Effect on specific heat
E.Khan,N.Sandulescu,Nguyen Van Giai, Phys.Rev.C
71,042801 (R) (2005)
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4. Connection between Extended Brueckner-HF and
Skyrme force
Can one relate Skyrme force to a nuclear matter
microscopic theory?

• Density Matrix Expansion (DME) method of
  Negele-Vautherin (1972)
• From Brueckner Theory to Skyrme Energy
  Functional, L.G. Cao, U. Lombardo, C.W. Shen, NVG
  (2005)
• fit of EBHF results in nuclear matter to
  determine the force parameters.

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Effective Masses
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Skyrme parameters from EBHF
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Finite Nuclei

• Density profiles

• Energies and Radii

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Other works in collaboration with Asia-Link
partners

• Neutrino mean free path in matter with
  Catania, Lanzhou, CIAE Beijing.
• Relativistic RPA (RRPA) with CIAE Beijing.
  Response functions in nuclei, calculated in
  momentum space.
• Relativistic Hartree-Fock (RHF) with PKU (see
  presentation of Wenhui Long). Near future
  RHF-RRPA.

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The contribution to Asia-Link from this research
program

• In the next 6 months, the Orsay Theory group will
  host
• 1 Master student from CIAE Beijing
• 1 PhD student from INST Hanoi
• 1 PhD student from Peking University