units of macroscopic cross sections

generation of macroscopic few-group cross sections for use in whole-core calculations of the MYRRHA minimal critical core with the nodal diffusion code 

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to the beam. Number of nuclei per unit volume (density of nuclei). Cross-section (microscopic cross-section). Particle flux (neutron flux). Lecture 29 

Eq. (3.13) can be solved as soon as the energy-averaged macroscopic cross-sections are given. With the exception of the multi-group differential macroscopic scattering cross-section

1986/1/1 · If Hc is the macroscopic cross-section for pair production for the com- pound, then ZMiHi Hc - (7) M where Mi/M is the fractional weight in the com- pound of element i. Since Hi (barn/atom) micro- scopically is dependent on Z2 it will, when ex- pressed as a macroscopic quantity, in cmZ/g, in- stead be dependent on Z.

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The macroscopic cross-section The units of Σ are m-1 (m-3.m2) and this represents the probability of an interaction per unit path length. So the number of interactions per unit volume (per unit time) in the target is also given by

The reflector block usually contains less information. The fissile material is not present there, therefore the macroscopic fission cross-section is zero. The reflector homogenized block consists of: • Σ a - absorption macroscopic cross-section • D/ Σ tr - diffusion coefficient or transport macroscopic cross-section describe the

The standard unit for measuring a nuclear cross section (denoted as σ) is the barn, which is equal to 10−28 m², 10−24 cm² or 100 fm². What is Barn cross section? How many neutrons are in a uranium 235 nucleus? 143 neutrons In the nucleus of each atom of uranium-235 (U-235) are 92 protons and 143 neutrons, for a total of 235.

macroscopic cross-section was obtained in polycarbonate doped with Gd2O3, the isotopes expressed in atomic mass units (amu). Table 1.

The macroscopic cross-section also referred as total neutron cross-section Σt, is used to characterize the probability of interaction which corresponds to the