# Ralph Amado

- Prof. Emeritus
- At University of Pennsylvania since 1959
- Professor of Physics, University of Pennsylvania
- Vice Provost for Research, University of Pennsylvania

D. Phil., Oxford (1957)

One of the fundamental questions of nuclear theory is how the modern picture of
the strong interactions based on quantum chromodynamics (QCD) accounts for
nuclear physics both in nuclei and in reactions such as nucleon antinucleon
annihilation. We are studying this problem by focusing on classical theories
that reflect the structure of non-perturbative QCD and in which the nucleons
appear as soliton-like solutions. We then reintroduce the leading quantum
corrections. This approach has led to a correct accounting of the principal
features of the nucleon-nucleon interaction, including the mid-range attraction.
It also gives a remarkable, integrated and simple account of the features of
nucleon antinucleon annihilation, particularly the branching ratios. We are
applying similar ideas to energetic heavy ion collisions where the final pion
fields may be approximated classically.

I am also interested in general
scattering theory and in algebraic approaches to dynamical problems.

- N.R. Walet and R.D. Amado, "Skyrmions and the Nuclear Force" Phys. Rev. C47, 498 (1993)
- R.D. Amado and I.I. Kogan, "Quantum Penomenology for the Disoriented Chiral Condensate," Phys. Rev. D51, 1587 (1995)
- R.D. Amado, R. Bijker, F. Cannata, J-P. Dedonder and N.R. Walet, "Quartets of Superdeformed Bands and Supersymmetry Breaking," Int. J. of Mod. Phys. E3, 171 (1994)
- Yang Lu and R.D. Amado, "NN Annihilations in Large Nc QCD with p and w mesons," Phys. Rev. C52, 2158 (1995).