THEORETICAL INVESTIGATION OF THE EXCHANGE CURRENT EFFECTS ON THE MAGNETIC FORM FACTOR OF HELIUM-3 AND HYDROGEN-3
Abstract
We calculate the magnetic form factor of ('3)He and ('3)H for momentum transfer Q('2) < 30 fm('-2). We use for our calculations a wave-function obtained from the solution of the Faddeev equation with the Reid soft-core potential. We consider the effects of both single-particle current (impulse approximation) and exchange currents (two-particle current) for both (pi)-meson and (rho)-meson exchange. Our currents satisfy the continuity equation. Calculations are performed in the case of a point nucleon at the nucleon-meson vertex. Also we consider the effect of the nucleon size at the nucleon-meson vertex by introducing a strong interaction form factor which decreases the effect of the exchange currents. We also study the effect of the neutron charge form factor on our calculations since it is not known very accurately except near Q = 0. By comparing our results with the most recent experimental data we can see that meson exchange currents improve the agreement between theoretical prediction and experimental results. Still, exchange currents are not enough to account for all the discrepancies. We expect that introduction of the theory of quark bags (clusters) will account for this difference.
Degree
Ph.D.
Subject Area
Nuclear physics
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