In proton-proton scattering, when both incident and target protons have polarizations of
P
1
and
P
2
respectively in a direction normal to the plane of scattering, the differential cross-section, σ, at angle
θ
is given by σ(
θ
) = σ
0
(
θ
) {1 + (
P
1
+
P
2
)
P
3
(
θ
) +
P
1
P
2
C
NN
(
θ
)}.
P
3
(
θ
) and
C
NN
(
θ
) are the polarization and spin-correlation parameters of proton-proton scattering, and are functions of incident proton energy and scattering angle. The Harwell synchrocyclotron provides a choice of two proton beams at an energy of 142MeV (
a
) high intensity
P
1
= 0, and (
b
) low intensity
P
1
= ±0.48.
P
3
(
θ
) is a well-known quantity, and the two remaining unknowns,
P
2
and
C
NN
(
θ
) can be obtained by comparing differential cross-sections measured with beams (
a
) and (
b
). Somewhat higher precision is obtainable in such a measurement of the target polarization
P
2
than by either of the existing solid-state methods (Schmugge & Jeffries 1962; Abragam, Borghini & Chapellier 1962).
Differential Cross Sections in Proton-Proton Scattering at 52.34 MeV
