E. Christy

Measurement of the neutron electric form factor via recoil polarimetry

Abstract.The ratio Gen/Gmn of the electric to the magnetic form factor of the neutron has been measured by analyzing the polarization of the recoiling neutron in quasi-elastic scattering of longitudinally polarized electrons from deuterium at the Q2 values of 0.45, 1.15, and 1.47 (GeV/c)2. The experiment has been performed in Hall C of the Thomas Jefferson National Accelerator Facility. With Gmn being known Gen can be deduced. The preliminary results show that the lowest Q2 points follow the Galster parametrization and that the 1.47 (GeV/c)2 point rises above this parametrization.

Electroproduction of strangeness on (Lambda)H-3,4 bound states on helium

The A(e,e′K+)X reaction has been investigated at Jefferson Laboratory. Data were taken for Q2 ≈ 0.35 GeV2 at a beam energy of 3.245 GeV for 1H,3He and 4He targets. Evidence for Λ‐hypernuclear bound states is seen for 3,4He targets. This is the first time that the electroproduction of these hypernuclei has been observed.

Electroproduction of strangeness on Λ3,4H bound states on Helium

The A(e,e′K+)X reaction has been investigated at Jefferson Laboratory. Data were taken for Q2 ≈ 0.35 GeV2 at a beam energy of 3.245 GeV for 1H,3He and 4He targets. Evidence for Λ‐hypernuclear bound states is seen for 3,4He targets. This is the first time that the electroproduction of these hypernuclei has been observed.

The Electric Form Factor of the Neutron via Recoil Polarimetry to Q2 = 1.47 (GeV/c)2

The Jefferson Laboratory E93‐038 collaboration conducted measurements of the ratio of the electric form factor to the magnetic form factor of the neutron, GEn/GMn, via recoil polarimetry from the quasielastic 2H(e,e′n)1H reaction at three values of Q2 [viz., 0.45, 1.15, and 1.47 (GeV/c)2] in Hall C of the Thomas Jefferson National Accelerator Facility. The preliminary results for GEn at Q2 = 0.45 and 1.15 (GeV/c)2 are consistent with the Galster parameterization; however, the preliminary result for GEn at Q2 = 1.47 (GeV/c)2 lies slightly above the Galster parameterization.

ELECTROPRODUCTION OF STRANGENESS ON LIGHT NUCLEI

The A(e,e{prime} K{sup +})YX reaction has been investigated in Hall C at Jefferson Laboratory for 6 different targets. Data were taken for Q{sup 2} {approx} 0.35 and 0.5 GeV{sup 2} at a beam energy of 3.245 GeV for {sup 1}H, {sup 2}H, {sup 3}He, {sup 4}He, C and Al targets. The missing mass spectra are fitted with Monte Carlo simulations taking into account the production of {Lambda} and {Sigma}{sup 0} hyperon production off the proton, and {Sigma}{sup -} off the neutron. Models for quasifree production are compared to the data, excess yields close to threshold are attributed to FSI. Evidence for {Lambda}-hypernuclear bound states is seen for {sup 3,4}He targets.