Absolute electron Proton Cross-Sections at Low Momentum Transfer Measured with a High Pressure Gas Target System - INSPIRE

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Absolute electron Proton Cross-Sections at Low Momentum Transfer Measured with a High Pressure Gas Target System

G.G. Simon
(
- Mainz U., Inst. Phys.
)
,
C. Schmitt
(
- Mainz U., Inst. Phys.
)
,
F. Borkowski
(
- Mainz U., Inst. Phys.
)
,
V.H. Walther
(
- Mainz U., Inst. Phys.
)

1980

11 pages

Published in:

Nucl.Phys.A 333 (1980) 381-391

Published: 1980

DOI:

10.1016/0375-9474(80)90104-9

View in:

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Abstract: (Elsevier)

Absolute differential cross sections for elastic electron-proton scattering have been measured in a four-momentum transfer range up to 1.4 fm −2 . Using a high pressure gas target system, we have obtained highly accurate data with a small normalization error of 0.5%. The electromagnetic form factors G E and G M have been extracted and the rms charge radius has been determined to be 〈r 2 E 〉 p 1 2 = 0.862±0.012 fm . The shape of the isovector spectral function near threshold shows a significant non-resonant contribution of the two-pion state. This enhancement is so strong that the derivative at q 2 = 0 differs considerably from the usual vector meson dominance model value. This result is in good agreement with theoretical predictions.

ELECTRON P: ELASTIC SCATTERING
ELASTIC SCATTERING: ELECTRON P
MOMENTUM TRANSFER: LOW
DIFFERENTIAL CROSS SECTION
P: FORM FACTOR
FORM FACTOR: P
FORM FACTOR: ELECTRIC
ELECTRIC: FORM FACTOR
FORM FACTOR: MAGNETIC
MAGNETIC: FORM FACTOR

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Figures(0)

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