PHOTONEUTRON REACTIONS IN G12 AND O16

1961 ◽  
Vol 39 (5) ◽  
pp. 643-656 ◽  
Author(s):  
J. P. Roalsvig ◽  
Ishwar C. Gupta ◽  
R. N. H. Haslam
Keyword(s):  
Cross Section ◽  
Yield Curve ◽  
Bremsstrahlung Energy ◽  
The Cross ◽  
Section Curve ◽  
Maximum Bremsstrahlung Energy ◽  
The University

Absolute yields of the reactions C12(γ,n)C11 and O16(γ,n)O15 have been determined at 22-Mev maximum bremsstrahlung energy using the University of Saskatchewan 24-Mev betatron. For the reaction C12(γ,n)C11 a yield curve from threshold to 24 Mev has been obtained and the cross-section curve for the reaction computed. A thorough comparison with other results has been made.

Optimization Analysis of the Wedge Block Surface of NYD Contact Backstop

2013 ◽  
Vol 433-435 ◽  
pp. 2277-2281
Author(s):  
Quan Wei Wang ◽  
Ming Hui Wang ◽  
Dong Li ◽  
Dian Mao Wan ◽  
Rong Meng
Keyword(s):  
Cross Section ◽  
Design Parameters ◽  
Optimization Analysis ◽  
Archimedes Spiral ◽  
The Cross ◽  
Section Curve ◽  
Relationship Of ◽  
The Relationship

By analyzing the relationship of the design parameters of NYD contact backstop, the cross-section curve of the wedge block has been discussed as Archimedes spiral, logarithm spiral and arc. Each curve is designed optimally using MATLAB optimization toolbox. The merits and drawbacks of each curve are discussed.

Radiative corrections to the scattering of electrons and positrons by electrons

1953 ◽  
Vol 220 (1141) ◽  
pp. 219-239 ◽  
Keyword(s):  
Cross Section ◽  
Ultra Violet ◽  
Laboratory Frame ◽  
Real Photon ◽  
Rest Energy ◽  
Electrons And Positrons ◽  
Charge Renormalization ◽  
The Cross ◽  
Maximum Bremsstrahlung Energy ◽  
Exact Calculations

The e 6 corrections to the Moller formula for the scattering of electrons by electrons and the Bhabha formula for the scattering of positrons by electrons, arising from the interaction of the particles with virtual photons, are formulated using the Feynman-Dyson techniques. After removing ultra-violet divergences by mass and charge renormalization the cross-section still suffers from a logarithmic infra-red divergence. This is cancelled by adding on the cross-section for the production of a single real photon of low energy during the collision. The result is evaluated assuming that the maximum bremsstrahlung energy radiated is small compared with the rest energy of the electron, as viewed from the laboratory frame. Non-relativistic and extreme relativistic approximations to the formulae are presented, together with the results of exact calculations for a laboratory energy of 20 mc 2 .

Virtual remanufacturing: Cross-section curve reconstruction for repairing a tip-defective blade

2015 ◽  
Vol 229 (17) ◽  
pp. 3141-3152 ◽  
Author(s):  
Wang Tao ◽  
Ding Huapeng ◽  
Wang Hao ◽  
Tang Jie
Keyword(s):  
Error Analysis ◽  
Cross Section ◽  
Small Scale ◽  
Section Plane ◽  
Curve Reconstruction ◽  
Key Factor ◽  
Data Points ◽  
Blade Tip ◽  
The Cross ◽  
Section Curve

Remanufacturing of damaged blades has been widely discussed in the field related with aero maintenance. Cross-section curve is the key factor for rebuilding 3D airfoil of a damaged blade. This paper focuses on how to reconstruct the cross-section curves of a tip-defective blade. The difficulty in the reconstruction of the cross-section curve is in broken region, where some data points are absent. In this paper, a method for reconstructing the cross-section curve in small-scale broken region of the blade tip is proposed. This method involves 3D noncontact digitization, methodology of obtaining the cross-section plane, cross-section curve reconstruction of the unbroken region, and cross-section curve deduction of the broken region. At last, an error analysis is carried out so as to indicate that the proposed method is appropriate for reconstructing the cross-section curve of the small-scale broken blade tip.

The coherent scattering of γ -rays by K electrons in heavy atoms - II. The scattering of 0·32 mc 2 γ -rays in mercury

1954 ◽  
Vol 227 (1168) ◽  
pp. 59-72 ◽  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Absorptive Part ◽  
Coherent Scattering ◽  
Heavy Atoms ◽  
University Of Cambridge ◽  
Γ Rays ◽  
The Cross ◽  
The University ◽  
Scattering Cross Sections

The results of calculations for the coherent scattering of γ -rays of energy 0·32 mc 2 by K electrons in mercury are given in a form which enables one to determine scattering cross-sections at any angle, for any initial and final polarizations and for any spin orientation of the electrons. The method used in doing the computation is that described in part І, the main part of the work having been performed on the EDSAC computer at the University of Cambridge. The dispersive contribution to the cross-section agrees with previous approximate calculations. The absorptive part is calculated as well and has the effect of adding to the cross-section a contribution approximately equal to one-sixth of the dispersive contribution at all angles of scattering.

scholarly journals Classification of young males’ shoulder shapes based on cross-sectional morphological characteristics

2021 ◽  
Vol 237 ◽  
pp. 02017
Author(s):  
FangYuan Hu ◽  
JuanFeng Jin ◽  
ShuQing Wang ◽  
WenJing Dang ◽  
ZhenZhen Guo ◽  
...  
Keyword(s):  
Cross Section ◽  
Three Dimensional ◽  
Morphological Characteristics ◽  
Curvature Radius ◽  
Cross Sectional ◽  
Young Males ◽  
Characteristic Points ◽  
The Cross ◽  
Section Curve ◽  
Body Scanner

This paper focused on the different characteristics of the shoulder cross-section curves closely related to the shape to subdivide the shoulder shapes. In this paper, 213 young college male students aged 18-26 were selected to measure the shoulder data with three-dimensional body scanner. With the help of imageware12.0 and matlabr2012b software, the cross-section curves which could be used to classify the shoulder shapes were extracted, and the method of subdividing the shoulder shapes with the curvature radius of the characteristic points of the cross-section curve and the ratio of sagittal to frontal diameter was established. K-means clustering method was used through dynamic clustering, the optimal classification number of shoulder shapes was determined to be 4 categories by variance analysis, and the shape differences of each shoulder shape were quantified; by comparing the curve shape of shoulder section, the curve change characteristics of 4 categories of shoulder section were further qualitatively described.

GAMMA–NEUTRON REACTIONS IN O16 AND N14

1952 ◽  
Vol 30 (3) ◽  
pp. 159-164 ◽  
Author(s):  
R. N. H. Haslam ◽  
H. E. Johns ◽  
R. J. Horsley
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Neutron Yield ◽  
Gamma Ray ◽  
Yield Curve ◽  
Specific Activity ◽  
Initial Portion ◽  
Activity Curve ◽  
Section Curve ◽  
Peak Cross Section

The cross sections for the reactions O16(γ, n)O15 and N14(γ, n)N13 have been determined by measurement of the induced positron activities. The oxygen cross-section curve has a slowly increasing initial portion after which it rises rapidly to a maximum peak cross section of 11.4 millibarns at 24.0 Mev. The nitrogen cross-section curve has an initial peak at about 13 Mev. Above 17 Mev., this curve increases sharply to a maximum value of 2.84 millibarns at 24 Mev. In order to explain the shape of the nitrogen curve, a relative total neutron yield curve has been determined from 12 to 20 Mev. by detecting the emitted neutrons with a rhodium foil. This neutron yield curve has the same shape as the nitrogen saturated specific activity curve. The anomalous shapes of the nitrogen and oxygen cross-section curves are explained in terms of the variation of gamma-ray absorption with energy.

scholarly journals The Cross Section for the 16O(g,n)15O Reaction

1957 ◽  
Vol 10 (2) ◽  
pp. 326 ◽  
Author(s):  
BM Spicer
Keyword(s):  
Fine Structure ◽  
Cross Section ◽  
Present Note ◽  
Yield Curve ◽  
Giant Resonance ◽  
Yield Curves ◽  
Single Level ◽  
The Cross

There have been a number of attempts to account for the nature of the giant resonance of nuclear photodisintegration (e.g. Goldhaber and Teller 1948; Steinwedel and Jensen 1950; Wilkinson 1955; and others). Levinger and Bethe (1950) believe that a " many-level" theory of the giant resonance is more satisfactory than a single-level theory. The existence of fine structure in the yield curve of the 16O(?,11,) reaction at energies near the giant resonance (Penfold and Spicer 1955) supports this conclusion. The purpose of the present note is to show that the existence of structure within the giant resonance may be demonstrated more simply than by the tedious study of fine structure in yield curves.

THE γp → K0Σ+ PHOTOPRODUCTION REACTION

2014 ◽  
Vol 26 ◽  
pp. 1460087
Author(s):  
◽  
HARTMUT SCHMIEDEN
Keyword(s):  
Cross Section ◽  
Electron Accelerator ◽  
Photon Beam ◽  
Reaction Channel ◽  
Quasibound State ◽  
Accelerator Facility ◽  
Beam Asymmetry ◽  
The Cross ◽  
Photoproduction Reaction ◽  
The University

The photoproduction reaction γp → K0Σ+ was investigated with the CBELSA/TAPS experiment at the electron accelerator facility ELSA of the University of Bonn. A pronounced structure in the cross section was found at the K* threshold. There are indications that this may be associated with the formation of a K*-hyperon quasibound state below the K* threshold. The very first measurements of the photon beam asymmetry in the studied reaction channel are presented and their impact is discussed.

A New Approach to the Demonstration of Oxidase-Localization Using Tannic Acid Or Catechin

1973 ◽  
Vol 31 ◽  
pp. 698-699
Author(s):  
V. Mizuhira ◽  
Y. Futaesaku
Keyword(s):  
Cross Section ◽  
Tannic Acid ◽  
Elastic Fiber ◽  
The Other ◽  
New Approach ◽  
Tissue Block ◽  
Active Reaction ◽  
The Cross

Previously we reported that tannic acid is a very effective fixative for proteins including polypeptides. Especially, in the cross section of microtubules, thirteen submits in A-tubule and eleven in B-tubule could be observed very clearly. An elastic fiber could be demonstrated very clearly, as an electron opaque, homogeneous fiber. However, tannic acid did not penetrate into the deep portion of the tissue-block. So we tried Catechin. This shows almost the same chemical natures as that of proteins, as tannic acid. Moreover, we thought that catechin should have two active-reaction sites, one is phenol,and the other is catechole. Catechole site should react with osmium, to make Os- black. Phenol-site should react with peroxidase existing perhydroxide.

Energy Distribution in Electron Beams

1972 ◽  
Vol 30 ◽  
pp. 568-569
Author(s):  
Tamotsu Ohno
Keyword(s):  
Electron Beam ◽  
Energy Distribution ◽  
Cross Section ◽  
Integral Curve ◽  
Electron Beams ◽  
Electron Gun ◽  
Angular Divergence ◽  
Apparent Increase ◽  
Integral Width ◽  
The Cross

The energy distribution in an electron; beam from an electron gun provided with a biased Wehnelt cylinder was measured by a retarding potential analyser. All the measurements were carried out with a beam of small angular divergence (<3xl0-4 rad) to eliminate the apparent increase of energy width as pointed out by Ichinokawa.The cross section of the beam from a gun with a tungsten hairpin cathode varies as shown in Fig.1a with the bias voltage Vg. The central part of the beam was analysed. An example of the integral curve as well as the energy spectrum is shown in Fig.2. The integral width of the spectrum ΔEi varies with Vg as shown in Fig.1b The width ΔEi is smaller than the Maxwellian width near the cut-off. As |Vg| is decreased, ΔEi increases beyond the Maxwellian width, reaches a maximum and then decreases. Note that the cross section of the beam enlarges with decreasing |Vg|.

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