Ac. Fonseca et Dr. Lehman, Dynamical study of H-1((d)over-right-arrow, gamma)He-3 tensor observables in the energy range of 80 keV to 95 MeV: Tests of effective two-body models, FEW-BODY SY, 28(3-4), 2000, pp. 189-229
Realistic interactions are used to study H-1((d) over right arrow,gamma)He-
3 tensor observables in the energy range of 80 keV to 95 MeV deuteron labor
atory energy, as well as the differential cross section for the two-body ph
otodisintegration of He-3. The Siegert form of the E1 multipole operator in
the longwavelength limit is taken as the sole component of the electromagn
etic interaction. The three-body Faddeev equations fbr the bound-state and
continuum wave functions are solved using the Paris, Argonne V14, Bonn-A, a
nd Bonn-B potentials. The corresponding nucleon-nucleon t-matrices are repr
esented in a separable form using the Ernst-Shakin-Thaler representation. T
he Coulomb force between protons is neglected and no three-nucleon force is
included. The contribution of nucleon-nucleon P-wave components to the obs
ervables is carefully studied, not only in the angular distribution of the
observables, but also as a function of the deuteron laboratory energy for f
ixed centre-of-mass angle. Comparison with data is shown wherever it exists
.
Results with simple Yamaguchi-type interactions with variable %D-state in t
he deuteron are compared with realistic interactions and one of these model
potentials is used to study the results in terms of contributions from spe
cific wave-function components or terms in the electromagnetic operator.
Effective two-body models are examined by means of a derivation that is con
sistent with the underlying three-body calculation and that leads to an eff
ective two-body t-matrix for neutron-deuteron elastic scattering carrying t
he same on-shell amplitudes as the original three-body equations.