Effective Field Theory of Nucleon-Nucleon Scattering on Large Discrete Lattices

Nuclear effective field theory is applied to the effective range expansion of S-wave nucleon-nucleon scattering on a discrete lattice. Lattice regularization is demonstrated to yield the effective range expansion in the same way as in the usual continuous open space. The relation between the effective range parameters and the potential parameters is presented in the limit of a large lattice.Comment: 24pages, 1 figur

Spin-Polarization Response Functions in High-Energy (e,e'p) Reactions

Spin-polarization response functions are examined for high-energy $(\vec{e},e'\vec{p})$ reaction by computing the full 18 response functions for the proton kinetic energy $T_{p'}=$ 0.515 GeV and 3.179 GeV with an 16O target. The Dirac eikonal formalism is applied to account for the final-state interactions. The formalism is found to yield the response functions in good agreement with those calculated by the partial-wave expansion method at 0.515 GeV. We identify the response functions that depend on the spin-orbital potential in the final-state interactions, but not on the central potential. Dependence on the Dirac- or Pauli-type current of the nucleon is investigated in the helicity-dependent response functions, and the normal-component polarization of the knocked-out proton, $P_n$, is computed.Comment: 22 pages, Latex, figures available at ftp://ftp.krl.caltech.edu/pub/users/rseki/it

Nuclear Lattice Calculation

Thermal property of low-density neutron matter is reliably determined by a large scale computation using supercomputers. Physics of superfluid in neutron matter are clarified, as a basis of the structure of neutron-halo nuclei and of outer crust of neutron stars. In achieving these, a novel method of lattice quantum Monte Carlo technique is applied by combining with effective field theory

Nuclear Lattice Calculation

Thermal property of low-density neutron matter is reliably determined by a large scale computation using supercomputers. Physics of superfluid in neutron matter are clarified, as a basis of the structure of neutron-halo nuclei and of outer crust of neutron stars. In achieving these, a novel method of lattice quantum Monte Carlo technique is applied by combining with effective field theory

Two- and Three-Pion Interferometry for a Nonchaotic Source in Relativistic Nuclear Collisions

Two- and three-pion correlation functions are investigated for a source that is not fully chaotic. Various models are examined to describe the source. The chaoticity and weight factor are evaluated in each model as measures of the strength of correlations and compared to experimental results. A new measure of three-pion correlation is also suggested.Comment: 19 pages, 6 figure

Yukawa theories as effective theories of quantum chromodynamics for a large number of colors

An effective theory for low-energy nuclear interactions is proposed, based on results obtained from the 1/Nc expansion of quantum chromodynamics. The Lagrangian is local in the meson sector, but in the baryon sector it is nonlocal both in the meson-baryon Yukawa coupling and in the baryon propagators. It satisfies an important consequence of the 1/Nc expansion, the suppression of baryon loops. Our findings are then shown to support the traditional approaches in nuclear physics and, more especially, the relativistic nuclear many-body theories at baryon-tree level