Abstract
The neutron velocity selector of the Cavendish Laboratory has been used to measure the scattering cross-sections of
ortho-
and
para
-hydrogen for slow neutrons. The triplet and singlet scattering amplitudes of the neutron-proton interaction may be deduced from these cross-sections. The values obtained are
a
t
= (0·537 ± 0·004) x 10
-12
cm,
a
s
= -(2·373 ±0·007) x 10
-12
cm, where
a
t
and
a
s
are the triplet and singlet scattering amplitudes respectively. The values of the coherent scattering amplitude ƒ = 2(3/4
a
+1/4
a
), and of the free proton cross-section σ
ƒ
= 4π(3/4
a
2
t
+ 1/4
a
2
s
given by the above values of
a
t
and
a
s
, are ƒ = -(0·380 ± 0·005) x 10
-12
cm, σ
ƒ
= (20·41 ± 0·14) x 10
-24
cm
2
.
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