Triple Pomeron coupling and pion inclusive scattering

1980 ◽  
Vol 58 (4) ◽  
pp. 455-462
Author(s):  
R. Migneron ◽  
J. L. Robinson
Keyword(s):  
Cross Section ◽  
Single Particle ◽  
Reliable Method ◽  
Diffractive Cross Section ◽  
Pomeron Coupling ◽  
Inclusive Reaction ◽  
Inclusive Scattering ◽  
The Cross ◽  
Good Agreement

A characteristic rise in the cross section near x = 1 has been reported for the single particle inclusive reaction π−p → π−X at Fermilab energies. Factorizable Regge amplitudes are used with a well-established analysis of the pp → pX peak to construct a parametrization of the triple-Regge couplings with αP(0) > 1 and to give a triple-Regge description of the meson + proton → meson + X cross section. Good agreement with the π−p → π−X data at 147 GeV/c is obtained and the peak is dominated by the triple-Pomeron component. This approach provides a reliable method for obtaining an estimate of the non-diffractive component. The inelastic diffractive cross section rises with energy and is found to account for most of the observed rise in σtot(π±p). The procedure is extended to K±p → K±X.

The inner shell ionization of atoms by electron impact

1940 ◽  
Vol 36 (1) ◽  
pp. 43-52 ◽  
Author(s):  
E. H. S. Burhop ◽  
H. S. W. Massey
Keyword(s):  
Experimental Data ◽  
Electron Impact ◽  
Cross Section ◽  
Nickel Silver ◽  
Inner Shell Ionization ◽  
Good For ◽  
The Cross ◽  
Shell Ionization ◽  
Good Agreement

Calculations have been made of the cross-section for ionization of the inner shells of atoms by electron impact in the cases of the K-shells of nickel, silver, mercury and of the three L-shells of silver and mercury.The agreement with experiment is reasonably good for the K-shell ionization, but only fair in the case of the rather meagre experimental data available for the L-shell. The values obtained for the relative ionization in the K- and L-shells are in good agreement with those to be expected from experiment.

Charge transfer from rare gas atoms to Kr+

1982 ◽  
Vol 60 (7) ◽  
pp. 981-987 ◽  
Author(s):  
B. Hird ◽  
S. P. Ali
Keyword(s):  
Charge Transfer ◽  
Energy Dependence ◽  
Cross Section ◽  
Rare Gas ◽  
Zener Model ◽  
Energy Data ◽  
Model Predictions ◽  
Rare Gas Atoms ◽  
The Cross ◽  
Good Agreement

The cross section for electron capture by Kr+ ions from rare gas atoms between 30 and 120 keV is found to be in good agreement with previous measurements where these exist, except for neon. The Rapp–Francis model gives an acceptable fit to the energy dependence of these and higher energy data but is too large by a factor of about five. In contrast the Landau–Zener model predictions are too large for helium and neon and too small for the heavier targets unless metastable states of krypton with large polarizabilities dominate the cross section.

A new empirical formula for cross-sections of (n,nα) reactions

2020 ◽  
Vol 29 (08) ◽  
pp. 2050062
Author(s):  
Mustafa Yiğit
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Empirical Formula ◽  
Nuclear Reactions ◽  
Measured Cross Section ◽  
Future Studies ◽  
Present Formalism ◽  
The Cross ◽  
Neutron Cross Sections ◽  
Good Agreement

Studies on the cross-sections of (n,n[Formula: see text]) reactions which are energetically possible, about 14 MeV neutrons are quite scarce. In this paper, the cross-sections of (n,n[Formula: see text] nuclear reactions at [Formula: see text]14–15 MeV are analyzed by using a new empirical formula based on the statistical theory. We show that neutron cross-sections are closely related to the [Formula: see text]-value of nuclear reaction, in particular for (n,n[Formula: see text]) channels. Results obtained with this empirical formula show good agreement with the available measured cross-section values. We hope that the estimations on the cross-sections using the present formalism may be helpful in future studies in this field.

scholarly journals Cross Section Ionization By Electron Impact Of Helium Like Ions

2021 ◽  
Author(s):  
Manel Hariz Belgacem ◽  
Elhabib Guedda ◽  
Haikel Jelassi
Keyword(s):  
Electron Impact ◽  
Cross Section ◽  
Cross Sections ◽  
Ground State ◽  
The Cross ◽  
State 1 ◽  
Unstable States ◽  
Good Agreement

<sub></sub> In this paper we present our calculation of the cross section ionization by electron impact of C V, N VI and O VII. Using the Flexible Atomic Code (FAC), we obtain the cross sections for the ionization of these ions from the ground state 1<sup>1</sup>S, and from the unstable states 2<sup>1</sup>S and 2<sup>3</sup>S. Our results are in good agreement with those based on the Coulomb Born (CB) approximation and the available measurements.

scholarly journals 14.8 MeV Neutron Activation Cross Section Measurements for Ge Isotopes

2009 ◽  
Vol 1 (2) ◽  
pp. 173-181 ◽  
Author(s):  
M. M. Haque ◽  
M. T. Islam ◽  
M. A. Hafiz ◽  
R. U. Miah ◽  
M. S. Uddin
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Gamma Ray ◽  
Reaction Cross ◽  
Activation Cross Section ◽  
Section Data ◽  
Gamma Ray Spectroscopy ◽  
24Na Reaction ◽  
The Cross ◽  
Good Agreement

The cross sections of Ge isotopes were measured with the activation method at 14.8 MeV neutron energy. The quasi-monoenergetic neutron beams were produced via the 3H(d,n)4He reaction at the 150 kV J-25 neutron generator of INST, AERE. The characteristics γ-lines of the product nuclei were measured with a closed end coaxial 17.5 cm2 high purity germanium (HPGe) detector gamma ray spectroscopy. The cross sections were determined with reference to the known 27Al(n,α)24Na reaction. Cross section data are presented for 72Ge(n,p)72Ga, 74Ge(n,α)71mZn and 76Ge(n,2n)75m+gGe reactions. The cross section values obtained for the above reactions were 24.78±1.75 mb, 1.69±0.11 mb and 860±50 mb, respectively. The results obtained were compared with the values reported in literature as well as theoretical calculation performed by the statistical code SINCROS-II. The experimental data were found fairly in good agreement with the calculated and literature data.  Keywords: Activation cross section; Neutron induced reaction; Gamma-ray spectroscopy; 14.8 MeV. © 2009 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. DOI: 10.3329/jsr.v1i2.1532  

Many-Electron Correlations in the Photoionization of a Nitrogen Atom

1974 ◽  
Vol 52 (4) ◽  
pp. 349-354 ◽  
Author(s):  
N. A. Cherepkov ◽  
L. V. Chernysheva ◽  
V. Radojević ◽  
I. Pavlin
Keyword(s):  
Nitrogen Atom ◽  
Cross Section ◽  
Cross Sections ◽  
Random Phase Approximation ◽  
Random Phase ◽  
Electron Correlations ◽  
Sum Rule ◽  
Hartree Fock ◽  
The Cross ◽  
Good Agreement

Photoionization cross sections for the outer shell of the nitrogen atom ground state are calculated in the single-particle Hartree–Fock approximation and, in order to take into account many-electron correlations, also in the Random Phase Approximation with Exchange (RPAE). To be able to apply the RPAE, its modification for the half-filled shell atom, such as nitrogen atom, is presented. Calculation of length and velocity forms of the cross section in both approximations are compared with the available experimental data, and a good agreement is obtained. It has been found that in the RPAE the influence of many-electron correlations in a nitrogen atom is not great, but it is very important since, in contrast to the Hartree–Fock approximation, it results in the validity of the sum rule and the coincidence of the length and velocity forms of the cross sections, in agreement with the requirement of the general theory. The angular distribution of photoelectrons is also calculated in the RPAE, which has not been measured so far.

THE HALF-LIFE OF Ni63

1956 ◽  
Vol 34 (12) ◽  
pp. 1742-1746 ◽  
Author(s):  
C. C. McMullen ◽  
B. D. Pate ◽  
R. H. Tomlinson ◽  
L. Yaffe
Keyword(s):  
Cross Section ◽  
Half Life ◽  
Specific Activity ◽  
Disintegration Rate ◽  
Activity Determination ◽  
The Cross ◽  
Good Agreement

The half-life of Ni63 has been found by a specific activity determination to be 125 ± 6 years. The number of atoms of Ni63 was determined mass spectrometrically and the disintegration rate by 4πβ-counting. The cross section for the reaction Ni62(n, γ)Ni63 has been found to be 21 ± 2 barns, in good agreement with that found by Pomerance.

Steady long slender droplets in two-dimensional straining motion

1979 ◽  
Vol 91 (3) ◽  
pp. 401-414 ◽  
Author(s):  
E. J. Hinch ◽  
A. Acrivos
Keyword(s):  
Cross Section ◽  
Experimental Results ◽  
Recent Analysis ◽  
Two Dimensional ◽  
Axisymmetric Case ◽  
Hyperbolic Flow ◽  
Theoretical Criterion ◽  
Theoretical Predictions ◽  
The Cross ◽  
Good Agreement

The recent analysis by Acrivos & Lo (1978) concerning the breakup of a long slender droplet in an axisymmetric straining motion is extended to the case of a two-dimensional hyperbolic flow. It is found that, although the cross-section of the droplet becomes significantly non-circular, the theoretical criterion for breakup is effectively the same as in the axisymmetric case. The theoretical predictions are in good agreement with the available experimental results.

scholarly journals Nucleon form factors at threshold

2019 ◽  
Vol 218 ◽  
pp. 04003
Author(s):  
Alexandr Milstein
Keyword(s):  
Invariant Mass ◽  
Cross Section ◽  
Cross Sections ◽  
Mass Spectra ◽  
Form Factors ◽  
Invariant Mass Spectrum ◽  
Nucleon Form Factors ◽  
The Cross ◽  
Good Agreement ◽  
Invariant Mass Spectra

The pp¯invariant mass spectra in the processes e+e−→ pp¯, e+e−→ nn¯, J/ψ → pp¯ω, J/ψ → pp¯ρ, and J/ψ → pp¯γ close to the pp¯is discussed. The optical potentials for NN¯pair in the superposition of S and D waves (due to tensor forces) at spin unity of the pair, as well as for NN¯pair in the S wave at spin zero of the pair, are proposed. The parameters of the potentials are obtained by fitting the cross sections of NN¯scattering together with the pp¯invariant mass spectra in e+e−→ pp¯annihilation and J/ψ decays. Good agreement with the available experimental data is achieved. Using our potential and the Green’s function approach we also describe the cross section of e+ e−→ 6π and the η’π+ π− invariant mass spectrum in the decay J/ψ → γη’π+π− in the energy region near the NN¯threshold.

scholarly journals Study of the process e + e– → π+ π– π0 with the CMD-3 detector at the electron-positron collider VEPP-2000

2020 ◽  
Vol 56 (4) ◽  
pp. 449-458
Author(s):  
D. S. Vasileuskaya ◽  
D. N. Grigoriev ◽  
I. G. Dudko ◽  
V. L. Ivanov ◽  
V. F. Kazanin ◽  
...  
Keyword(s):  
Cross Section ◽  
Energy Region ◽  
Electron Positron ◽  
Born Cross Section ◽  
The Cross ◽  
Good Agreement ◽  
Integrated Luminosity

The cross section of the process e+ e– → π+ π– π0 was measured with the CMD-3 detector at the electron-positron collider VEPP-2000 in the energy region from 750 MeV to 800 MeV in c.m.s. This measurement was based on the data collected in 2013 and related to an integrated luminosity of about 7.8 pb–1. The procedure for obtaining the Born cross section and determining the parameters of the ω-meson was worked out. The preliminary ω-meson parameters mω = 782.70 ± 0.02 ± ± 0.11 MeV, Гω = 8.74 ± 0.05 ± 0.22 MeV, σ0(ω → π+ π– π) = 1545 ± 4 ± 39 nb were obtained. The results were compared with previous data and proven to demonstrate a good agreement with them.

Sign in / Sign up

Export Citation Format

Share Document