microscopic vs macroscopic cross section
microscopic vs macroscopic cross section
microscopic vs macroscopic cross section
between microscopic, mesoscopic, and macroscopic flow models. from publication: State-of-the-art of vehicular traffic flow (11.2-mi) section of Autobahn 9 near Munich, Germany. These combined
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The term cross section may refer to the microscopic cross section, Neutron Excitation Function – A plot of cross section vs neutron energy for a given
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There are two kinds of cross sections, microscopic and macroscopic. Microscopic cross section refer to cross sections of neutrons reacting with a specific
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S_nu = S_u234 + S_u235 + S_u238. Now since you already have the microscopic cross sections for each isotope, the only thing you need to do to get the macroscopic cross section is to find each number density, N_i. N_i = y_i * rho * N_a/M, where y_i is the atom fraction of isotope i in the natural uranium, rho is the density of the natural
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5 Neutron reaction cross sections •Total microscopic neutron cross section is expressed as: σ= dN/dt / [(I/A) n A ∆x] • Defining neutron flux as: φ= I/A (neutrons/sec.cm2) • Then: dN/dt = φ(A ∆x n σ) • Neutron flux can also be defined: φ= nnvn where: nn is neutron density per cm3 in beam, vn relative velocity (cm/sec.) of neutrons in beam
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2/24 · macroscopic cross-section Sources: Orange Book, 2 nd ed., p. 217 [ Terms ] [ Book ] PAC, 1994, 66 , 2513. ( Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994) ) on page 2517 [ Terms ] [ Paper ]
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The distinction between macroscopic and microscopic cross-section is that the former is a property of a specific lump of material (with its density), while the latter is an intrinsic property of a type of nuclei.
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interaction with a single nucleusj it is &Hledthe microscopic cross section and is.given the symbol C.(A macroscopic cross section for use with bulk mdtter
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Subtitle level 2: Microscopic versus macroscopic cross section Research40|$|ritical slab thickness (when applicable) compare to the Monte Carlo
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Total microscopic neutron cross section is expressed as: v n relative velocity (cm/sec.) of neutrons in beam. • Cross section σ can be experimentally
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In fact, this technology is matching or surpassing expert wood anatomists in both macroscopic and microscopic image recognition and is being
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2022/3/12 · Microscopic adjective. of or relating to or used in microscopy; ‘microscopic analysis’; ‘microscopical examination’; Microscopic adjective. too small to be seen except under a microscope. Microscopic adjective. infinitely or immeasurably small; ‘two minute whiplike threads of protoplasm’; ‘reduced to a microscopic scale’;
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While the microscopic cross-sectionconveysinformationabout the probabilities ofscattering, absorption orfission for an individual nucleus, the calculation ofthe rates ofthese processes for the reactor as a whole involves, in addition. the numbers of atoms ofeachmaterial perunit volume ofthereactor.
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Quantifying radiation damage can be done by analyzing the neutron microscopic and macroscopic cross sections of the materials. The cross sections express the likelihood of an interaction between
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The microscopic cross-section represents the effective target area of a single target nucleus for an incident particle. The units are given in barns or cm2. While the macroscopic cross-section represents the effective target area of all of the nuclei contained in the volume of the material, the units are given in cm-1.
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v). Describe in general terms the variation of absorption cross-section of U-235 and U-238 with neutron energy. 3.3 THE MICROSCOPIC CROSS-. SECTION.
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While the macroscopic cross-section represents the effective target area of all of the nuclei contained in the volume of the material. The units are given in cm-1. A macroscopic cross
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Microscopic Cross-Sections. Cross-Sections: Probability that a neutron-nuclei reaction will occur is characterized by nuclear cross-sections.
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The difference between the microscopic and macroscopic cross-sections is extremely important. The microscopic cross-section represents the effective target area of a single nucleus. In contrast, the macroscopic cross-section represents the effective target area of all of the nuclei contained in a certain volume. Nuclear Radius Total Cross-section
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Formally, the equation above defines the macroscopic neutron cross-section (for reaction x) as the proportionality constant between a neutron flux incident on a (thin) piece of material and the number of reactions that occur (per unit volume) in that material. The distinction between macroscopic and microscopic cross-section is that the former
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In this study, the total thermal neutron macroscopic and microscopic cross sections of. V, Co, Cu, In, Dy and Au were measured using neutron self-absorption
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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 probability that a
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Microscopic Versus Macroscopic Cross Section Up to now, the cross section referred to in this article corresponds to the microscopic cross section σ.However, it is possible to define the macroscopic cross section Σ which corresponds to the total “equivalent area” of all target particles per unit volume:
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is also common to define the macroscopic cross section Σx to group all the of nuclear reaction is characterized by a specific microscopic cross section.
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