These questions can be answered in two ways: analytically, by invoking a complicated double differential scattering cross section in the LAB system, or numerically, by calculating the collision rates for initial neutron trajectories (for neutrons emitted from the internal cylindrical surface of the moderator), simulating the isotropic angular distribution
of scattering in the CM coordinate system, and finally by performing analytical transformation of the scattered velocity vectors to the LAB system in order to follow neutron trajectories to the detector.
Vertical Angular Distribution
of Synchrotron Radiation
Another publication from our collaboration used the angular distribution
information to determine the electronic structure, symmetry, and decay dynamics for members of the TO series(16).
For an ideal meter, the spectral responsivity can be calibrated using an incident beam of any solid angle, and the meter can then be used to correctly measure light entering the meter aperture over any angular distribution
. In reality, meters are not ideal and have a responsivity that decreases with angle faster than the cosine function.
When multiple scattering occurs, the angular distribution
becomes less strongly peaked .
Figure 2 shows the angular distribution
of P and S waves.
Figure 1(a) shows the radiation power distribution versus wavelength with a peak value of 447 nm; Figure 1(b) shows the angular distribution
of the luminous intensity curve.
These methods need not any spectral searching and it can deal with unknown angular distribution
In the paper, we theoretically study the angular distribution
of [eta] mesons for different incident photon energies [E.sub.[gamma]] and for different final state energies W.
Several types of uncertainties can be considered, that is, those due to (1) neutron/gamma multigroup cross-sections, (2) energy-dependent response functions, and (3) secondary angular distribution
(SAD) or secondary energy distribution (SED) uncertainties.
In the vicinity of the substrate, that is, in the presheath and sheath, the ions are accelerated and their angular distribution
The angular distribution
of backscattered light intensity was approximated by Gaussian distribution, and its standard deviation was used for the surface roughness analyses.