Interaction coefficient = Macroscopic cross-section. In previous courses, you have learned the concept of the macroscopic cross section, , for a material as the probability of interaction per unit path, with units of . For photons, the traditional symbol for this is ; same idea, same unit.

The standard unit for measuring the microscopic cross-section (σ-sigma) is the barn, equal to 10-28 m2. This unit is very small. Therefore barns (abbreviated as "b") are commonly used. The cross-section σ can be interpreted as the effective 'target area' that a nucleus interacts with an incident neutron.

2. Explain concept of cross section: σ(E), macroscopic cross section: Σ(E), mean free path 3. Explain rate laws for bulk power production from fission 4. Explain how to get information from

macroscopic cross-section cross-section per unit volume of a given material for a specified process NOTE 1 - For a pure nuclide, the value of the macroscopic cross-section is the product of the value of the microscopic cross-section and the number of target atomic nuclei per unit volume; for a mixture of nuclides, it is the sum of such products.

A macroscopic cross-section is derived from microscopic cross-section and the atomic number density: Σ=σ.N Here σ, which has units of m 2, is the microscopic cross-section. Since the units of N (nuclei density) are nuclei/m 3, the macroscopic cross-section Σ has units of m -1.

The coherent and incoherent parts of the elastic scattering cross section are cases the spin incoherence cross section (first term in units of barn).

Multigroup neutron cross sections were generated for the deterministic cm2) to macroscopic cross sections (in units of 1/cm) as used by SCEPTRE using 

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The macroscopic cross-section is the probability that a neutron will undergo a reaction per unit path length travelled in the material. 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

Define the macroscopic cross-section (and its unit). iv). Defme the neutron Oux and its use in determining the reaction rate per unit volume. v).

2/24 · The cross-section per unit volume of a given material for a specified process. For a pure @[email protected], it is the product of the @[email protected] and the number of target nuclei per unit volume; for a mixture of nuclides, it is the sum of such products.

The cross section is not in general equal to the actual area of the nucleus. For instance the radiative capture cross section for Au197 at the peak of 4.9 eV resonance is 3x10-20 2cm , whereas the geometrical area of its nucleus is just 1.938x10-24 cm2. The reaction cross section is much greater than the physical cross section of the nucleus

The macroscopic cross section denoted by the Greek upper case sigma and is expressed in units per centimeter travel of the neutron in a medium. To.

The macroscopic cross sections of fuel cell, neutron trap, control rods, and other nonfuel lattice cells were prepared via lattice cell calculations using the PIJ code and ENDF/B-VII.0 data library [6, 8].

Download scientific diagram | Macroscopic cross-sections of a coconut palm stem (a) outer part, (b) intermediate part, (c) inner part. from publication: Distribution of lignin in vascular bundles

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