Search

We have measured the first complete angular correlations of [alpha]-particle emission from the [sup 12]C isoscalar giant quadrupole resonance (GQ[sub 0]R) following excitation by inelastic electron scattering, for momentum transfers from 0.24 to 0.61 fm[sup [minus]1]. Analysis of these uniquely determines the GQ[sub 0]R strength distribution for the [alpha][sub 0] channel and sets limits on that for [alpha][sub 1].

We report measurements of asymmetries in quasielastic scattering of polarized electrons from polarized {sup 3}He at {ital Q}{sup 2}={minus}0.2 (GeV/{ital c}){sup 2}. We measure {ital A}{sub {ital T}{prime}}=({minus}2.6{plus minus}0.9{plus minus}0.46)% and {ital A}{sub {ital T}{ital L}{prime}}=(+1.75{plus minus}1.2 {plus minus}0.31)%. The asymmetry {ital A}{sub {ital T}{prime}} depends predominantly on the previously measured neutron magnetic form factor and provides a test of theories of spin-dependent quasielastic scattering. Our result for {ital A}{sub {ital T}{prime}} is consistent with a previously reported measurement and suggests that the current theoretical picture is incomplete and final-state-interaction and meson-exchange corrections are necessary if the electric form factor of the neutron is to be reliably extracted from the asymmetry {ital A}{sub {ital T}{ital L}{prime}}.