The Continuum Spectrum of the 4N System. Results and Challenges

Abstract

The recent calculation of the four nucleon continuum spectrum are reviewed. Faddeev-Yakubovsky equations in configuration space have been solved for the four nucleon system with special interest in their scattering states. We present results concerning the structure of the first $^4$He, scattering states in different (T,S) channels including the first inelatic threshold N+3N$\to$NN+NN and the n-t cross section using realistic potentials.Comment: 9 pages, 8 Figures Contribution to the 16th International IUPAP conference on Few-Body Problems in Physics, Taipei 6-10 march 2000. to be published in Nucl. Phy