1 - IAEA Nuclear Data Services
1 - IAEA Nuclear Data Services
1 - IAEA Nuclear Data Services
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131 -<br />
is made. The total and the total inelastic cross<br />
sections are calculated from the experimental results<br />
and are shown in figs. 2 and 3.<br />
1.3.3. On Natural Silicon<br />
At the end of 1966, angular distributions of neutrons<br />
elastically and inelastically scattered by natural<br />
silicon were measured at eight energies between 4.00<br />
and 5.75 MeV. The final absolute neutron differential<br />
elastic and inelastic (Q = 1.77 MeV) scattering cross<br />
sections were evaluated. At the highest primary neutron<br />
energy of 5.75 MeV also the cross sections for neutron<br />
differential inelastic scattering leading to the second<br />
(Q = 4.61 MeV) and to the third (Q = 4.97 MeV) excited<br />
PR<br />
states of the Si nucleus were extracted from the<br />
measurements [6]<br />
1.3.4. Neutron Angular Distributions from the C(d,n) ^N and<br />
15 N(d,n) 16 0 Reactions T7]<br />
A typical time-of-flight spectrum for the reaction<br />
l4 C(d,n) 15 N is shown in fig. 4.<br />
1.3.5. On Carbon<br />
Since the total cross section of Carbon is a monotonic<br />
function of the neutron energy below 2.0 MeV<br />
and since only neutron elastic scattering is possible<br />
in the same energy region, the differential neutron<br />
scattering cross section of Carbon is especially well<br />
suited as a standard for neutron scattering in this<br />
region. For this reason accurate determination of<br />
the differential elastic scattering cross sections<br />
is necessary. So far angular distributions at eight<br />
primary neutron energies between 0.8 and 1.5 MeV<br />
were measured. Up to now at each energy, measurements<br />
were taken between 20° and 150° in angle steps<br />
of 10°.