Chiral Symmetry and the Nucleon-Nucleon Interaction: Developing an Accurate NN Potential Based upon Chiral Effective Field Theory

We present an accurate nucleon-nucleon (NN) potential based upon chiral effective Lagrangians. The model includes one- and two-pion exchange contributions up to chiral order three and contact terms (which represent the short range force) up to order four. Within this framework, the NN phase shifts below 300 MeV lab. energy and the properties of the deuteron are reproduced with high-precision. This chiral NN potential may serve as a reliable starting point for testing the chiral effective field theory approach in exact few-nucleon and microscopic nuclear many-body calculations.Comment: 15 pages, 6 figures; invited talk presented at the 7-th International Spring Seminar on Nuclear Structure Physics ``Challenges of Nuclear Structure'', Maiori (near Naples, Italy) May 27-31, 200

Three-nucleon force effects in the FSI configuration of the d(n, nn)p breakup reaction

We investigated three-nucleon (3N) force effects in the final state interaction (FSI) configuration of the d(n, nn)p breakup reaction at the incoming nucleon energy E n = 200 MeV. Although 3N force effects for the elastic nucleon-deuteron scattering cross section at comparable energies are located predominantly in the region of intermediate and backward angles, the corresponding 3N force effects for the integrated FSI configuration breakup cross section are found also at forward scattering angles

Three-Nucleon Force Effects in the FSI configuration of the d(n, nn)p Breakup Reaction

We investigated three-nucleon (3N) force effects in the final state interaction (FSI) configuration of the d(n, nn)p breakup reaction at the incoming nucleon energy E n = 200 MeV. Although 3N force effects for the elastic nucleon-deuteron scattering cross section at comparable energies are located predominantly in the region of intermediate and backward angles, the corresponding 3N force effects for the integrated FSI configuration breakup cross section are found also at forward scattering angles.Comment: Submission to SciPost, 6 pages, 1 figure, Proceedins of the 24th European conference on few-body problems in physics (EFB24) at the University of Surrey, Guildford, United Kingdom, from 2 to 6 September 201

Master Formula Approach to Chiral Symmetry Breaking: Pi-Pi scattering

The master formula approach to chiral symmetry breaking is used to analyze the phase shifts for $\pi\pi$ scattering in the elastic region. The results are in excellent agreement with the data for the phase shifts up to the K-K bar threshold. Our analysis shows that the pi-pi data near threshold in the scalar channel favors a large quark condensate in the vacuum, i.e. \sim -(240 MeV)^3.Comment: 17 pages, LaTeX, 1 postscript file of 12 figures in addition. Equation 2 is changed, the rest is the sam

Chiral Perturbation Theory for Nuclear Physicists

Chiral perturbation theory is the low energy effective theory of the strong interactions for the light pseudoscalar degrees of freedom. This program is based on effective Lagrangian techniques and is an expansion in the powers of the momenta and the powers of the quark masses, which correct the soft-pion theorems. After briefly reviewing these features and some results, we address the implications of this program to $\pi-N$ scattering, the $\pi-N$ sigma term and some recent investigations of the implications of chiral symmetry to nucleon-nucleon forces. We finally look at the implications of chiral perturbation theory to hadron mass relations.Comment: 20 pages plain LaTeX, to be run twice. Invited talk at the DAE Nuclear Physics Symposium - 1997, December 26-30, 1997, Bangalore, Indi

A microscopic equation of state for neutron-rich matter and its effect on neutron star properties

Chapter prepared for the book "Astrophysics", ISBN 979-953-307-389-6, INTECH Publishers (in press).Comment: 34 pages, 20 figure