Measurement of the absolute n p scattering differential cross section at 194 MeV.
We describe a double-scattering experiment with a novel tagged neutron beam to measure differential cross sections for np backscattering to better than +/-2% absolute precision. The measurement focuses on angles and energies where the cross section magnitude and angle dependence constrain the charged pion-nucleon coupling constant, but existing data show serious discrepancies among themselves and with energy-dependent partial-wave analyses. The present results are in good accord with the partial-wave analyses, but deviate systematically from other recent measurements.
Sarsour
M
M
Indiana University Cyclotron Facility and Department of Physics, Bloomington, IN 47408, USA.
Peterson
T
T
Planinic
M
M
Vigdor
S E
SE
Allgower
C
C
Bergenwall
B
B
Blomgren
J
J
Hossbach
T
T
Jacobs
W W
WW
Johansson
C
C
Klug
J
J
Klyachko
A V
AV
Nadel-Turonski
P
P
Nilsson
L
L
Olsson
N
N
Pomp
S
S
Rapaport
J
J
Rinckel
T
T
Stephenson
E J
EJ
Tippawan
U
U
Wissink
S W
SW
Zhou
Y
Y