九大原子核セミナー

2010年5月14日(金) 16:00

講師：Henryk Witala氏(Jagiellonian University)
演題：A novel approach to include proton-proton Coulomb force into the 3N continuum calculations
場所：理学部物理大学院講義室（理学部2号館2階2263室）

概要　：
Recently introduced novel approach to include the proton-proton Coulomb force into the momentum space 3N Faddeev calculations will be presented. It is based on a standard formulation for short range forces and relies on a screening of the long-range Coulomb interaction. In order to avoid all uncertainties connected with an application of the partial wave expansion, unsuitable when working
with long-range forces, we apply directly the 3-dimensional proton-proton screened Coulomb t-matrix. That main new ingredient, the 3-dimensional screened proton-proton Coulomb t-matrix, is obtained by a numerical solution of the 3-dimensional Lippmann-Schwinger equation. Using a simple dynamical model for the nuclear part of the interaction the feasibility of that approach will be demonstrated. The physical elastic proton-deuteron scattering amplitude has a well defined screening limit and does not require renormalisation. Well converged elastic proton-deuteron cross sections are obtained at finite screening radii. Also the proton-deuteron breakup observables can be determined from the resulting on-shell 3N amplitudes increasing the screening radius. However, contrary to the proton-deuteron `elastic scattering, the screening limit exists only after renormalisation of the proton-proton t-matrices.