We have carried out an (e,e'p) experiment at high momentum transfer and in parallel kinematics to measure the strength of the nuclear spectral function S(k,E) at high nucleon momenta k and large ...removal energies E. This strength is related to the presence of short-range and tensor correlations, and was known hitherto only indirectly and with considerable uncertainty from the lack of strength in the independent-particle region. This experiment locates by direct measurement the correlated strength predicted by theory.
Precise data on the neutron magnetic form factor Gmn have been obtained with measurements of the ratio of cross sections of D(e,e′n) and D(e,e′p) up to momentum transfers of Q2=0.9 (GeV/c)2. Data ...with typical uncertainties of 1.5% are presented. These data allow for the first time to extract a precise value of the magnetic radius of the neutron.
A high-precision polarimeter Hauger, M.; Honegger, A.; Jourdan, J. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
04/2001, Letnik:
462, Številka:
3
Journal Article
Recenzirano
We have built a polarimeter in order to measure the electron beam polarization in hall C at JLAB. Using a superconducting solenoid to drive the pure-iron target foil into saturation, and a ...symmetrical setup to detect the M
øller electrons in coincidence, we achieve an accuracy of <1%. This sets a new standard for M
øller polarimeters.
The neutron magnetic form factor
G
mn
has been determined via a measurement of the ratio of cross sections
D(
e,
e′
n) and
D(
e,
e′
p). The absolute detection efficiency of the neutron detector was ...measured with high accuracy using tagged neutrons produced from
H(
n,
p)
n elastic scattering by means of a high intensity neutron beam. This approach minimizes the model dependence and improves upon the weakest points of previous experiments. Data in the range
q
2=0.2–0.8 (GeV/c)
2 with uncertainties of <2% are presented.
We report the first measurement using a solid polarized target of the neutron electric form factor G(n)(E) via d-->(e-->,e(')n)p. G(n)(E) was determined from the beam-target asymmetry in the ...scattering of longitudinally polarized electrons from polarized deuterated ammonia ( 15ND3). The measurement was performed in Hall C at Thomas Jefferson National Accelerator Facility in quasifree kinematics with the target polarization perpendicular to the momentum transfer. The electrons were detected in a magnetic spectrometer in coincidence with neutrons in a large solid angle segmented detector. We find G(n)(E) = 0.04632+/-0.00616(stat)+/-0.00341(syst) at Q2 = 0.495 (GeV/c)(2).
Proton-deuteron radiative capture has been studied with polarized deuterons at a laboratory deuteron energy
E
d = 45 MeV. Precise data for the tensor analyzing power
A
yy
have been measured in the ...angular range 50° to 160°. Three-nucleon Faddeev wave functions in the initial scattering and final bound state are calculated using realistic nucleon-nucleon potentials. Mesonic exchange currents are included according to Siegert's theorem. Comparison to other recent experimental data is performed as well.
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