Delta degrees of freedom are introduced into antisymmetrized molecular
dynamics (AMD). This is done by increasing the number of basic states in the
AMD wave function, introducing a Skyrme-type delta-nucleon potential, and
including NN↔NΔ reactions in the collision description.
As a test of the delta dynamics, the extended AMD is applied to (p,p′)
recations at Elab=800 MeV for a 12C target. It is found that the
ratio and the absolute values for delta peak and quasielastic peak (QEP) in the
12C(p,p′) reaction are reproduced for angles \Theta_{\rm lab} \agt
40^\circ, pointing to a correct treatment of the delta dynamics in the
extended AMD. For forward angles the QEP is overestimated. The results of the
AMD calculations are compared to one-step Monte Carlo (OSMC) calculations and a
detailed analysis of multi-step and delta potential effects is given. As
important side results we present a way to apply a Gallilei invariant theory
for (N,N′) reactions up to Elab≈800 MeV which ensures
approximate Lorentz invariance and we discuss how to fix the width parameter
ν of the single particle momentum distribution for outgoing nucleons in the
AMD calculation.Comment: 28 pages, revtex, 12 figures included, figures are also available
upon request as postscript files from the authors (e-mail:
[email protected]), submitted to Phys. Rev.