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Showing 1 to 20 of 38 for “"Total cross section"”.
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Measurement of the total cross section for the π - 2π reaction p(π⁺, π⁺ π⁰)p near threshold
A feasibility study for measuring the total cross section of the π - 2π reaction, π⁺p → π⁺π⁰p, was performed at incident pion kinetic energies of 195 and 201 MeV. It was not possible to measure the total cross section with the present apparatus. Modifications and improvements to the present …
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Gluon propagator in classical color field of colliding hadrons and its implications for hadronic cross sections
… minijet approach, the asymptotic behavior of the total cross section calculated using currently accepted gluon distribution function and perturbative QCD rises too rapidly when compared with the data and fails to satisfy Froissart bound. To tame the rise, we have developed a new formalism for the …
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Studies of charge transfer in the N+L₂P-N₂P system
Total charge-transfer cross sections have been obtained in the N₂⁺ - N₂ system with relative ion energies at seven different values between 9 and 441 eV. Data is obtained to examine the curvature and structural relation between total cross section versus ion energy. The effect of ion beam …
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Regge pole and K-matrix models for two particle reactions
… that certain physical quantities, such as the cross section, be free of kinematical singularities. Particular consideration is given to the t-channel reaction NN - PV, Solutions for the residue functions are obtained for this reaction for all trajectories with natural parity and for all …
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A search for parity non-conservation in polarized proton-nucleon scattering at 6 GEV/C
… Synchrotron to measure the dependence of the total proton-nucleon cross section on the helicity of the incident proton. A dependence of the total cross section on the proton helicity is a measure of the strength of the weak interaction in the hadronic system. The cross section was determined …
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Discrete Variable Representation Of The Angular Variables In Quantum Three-Body Scattering
… a partial-wave decomposition of the total wave function is carried out first, allowing the scattering system to be solved one partial wave at a time. This is convenient when the interaction is central, causing the total angular momentum to be conserved during the collision process. …
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Parallel computing solutions to the Balitsky-Kovchegov equation
… Balitsky-Kovchegov (BK) equation for the total cross section, including a number of efforts to consistently implement evolution at next-to-leading-order[1-5]. Aside from NLO there is a growing interest in studying new, more exclusive, observables, such as single transverse spin asymmetries …
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An absolute measurement of the photodisintegration of Helium-4
A measurement of the differential cross section has been performed for the photodisintegration of ⁴He into a proton plus a triton. This reaction is highly sensitive to the electromagnetic currents in the nucleus which arise from the exchange of mesons between nucleons. The study of light nuclei …
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The Gamma Intensity Monitor at the Crystal-Barrel-Experiment
… the solid angle about the target. To measure the total cross section of these reactions, the total flux of photons through the target must be known to high accuracy. As the total cross section for nuclear photoproduction is low, counting the photons unscattered in the target is sufficiently …
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Asymmetry dependence of correlations in exotic nuclei
… technique was developed to measure the neutron total cross section of the rare: but stable) isotope <super>48</super>Ca using a sample that is an order of magnitude smaller than would be required for the conventional technique. The isotopic and energy dependence of neutron total cross sections: …
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A Scan of the Cross Section of the Reaction (Antiproton + Proton Going to Antilambda + Sigma-0 and Charge Conjugate) From Threshold to 2.5 MeV Excess Energy
The total cross section of the reaction pp→LS0+c. c. at ten momentum values within 2.5 MeV of threshold was measured using the Low Energy Antiproton Ring (LEAR) at CERN. The cross section was normalized against the similar reaction pp→LL and a novel background estimation using …
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Differential cross sections for the reaction He[superscript 3] ([gamma],[rho]) H[superscript 2] from 45 to 150 MeV
Differential cross sections for the reaction He 3 (y,p)H2 were measured for photons of 45 to 150 MeV at five angular settings: (theta p , theta d) = (30°, 142°) I (60°, 106°), (90° I 75°), (120°, 47.5°), and (135°, 34.5°) in the laboratory. At ep of 60° and 90°, [equation] was obtained for photon …
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A neutron diffraction spectrometer
… spacing of the copper crystal. A measure of the total cross section of cadmium from 0.01 to 1.0 ev has been obtained from transmission data for a thin cadmium sheet. The position of the low energy resonance peak confirms the computed calibration. The resolution of the instrument and the intensity …
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Quantum electrodynamic model for production amplitudes at infinite momentum
… a simple form for the sum of all the partial cross sections generated by these diagrams. The number distribution P(n), the average number of pairs produced, the,two particle and one particle momentum distributions and the total cross section are obtainec1,. The two particle distribution is …
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Measurement of Exclusive Photo-Production of K+ Σ*- Quasi-Free off Neutrons In Deuterium
… off neutrons in deuterium. It presents the first total cross section, σ , of this production channel as well as the differential cross section, dσ/dcosθ<sub>CM</sub>. In order to understand the production mechanism, the angle distribution in the t-channel helicity frame (Gottfried-Jackson frame) is …
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Measurement of the D*+- cross-section at HERMES
… ( K^- pi^+ ) pi^+_s with the Delta M method. The total cross-section for the electroproduction of D^{*+/-} mesons on a proton target has been measured in a fixed target experiment with a lepton beam energy of 27.5 GeV. The analysis is based on data collected by HERMES in 1997. From this result, …
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Models for meson-deuteron scattering in the resonant region
… description to regions in which the mesonnucleon cross section varies rapidly or' resonates, by including effects caused by the nucleons' Fe-rmi momenta, non-forward intermediate scattering, and off-energy shell scattering. It is concluded, after a numerical analysis, that Glauber theory itself …
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Four-Fermion production at LEP using the OPAL detector
… for electrons or muons, has been investigated. Cross-sections have been calculated for all centre-of-mass energies and compared to those expected from Monte Carlo predictions. <br>ZZ decays into $ <br>m q ar{q}l^+l^-$, where l stands for <br>electrons, muons or taus, were investigated as well. …
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Electroproduction of Phi(1020) Mesons at High Q² with CLAS
… at CLAS. After successful signal identification, total and differential cross sections are measured and compared to the world data set. Comparisons are made to the predictions of the Jean-Marc Laget(JML) model based on Pomeron plus 2-gluon exchange. The overall scaling of the total cross section …
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The ZZ → 4l process and anomalous triple gauge couplings with ATLAS at the LHC
… = 13 TeV at the LHC during 2015 and 2016 (a total integrated luminosity of 36.1 fb$^{-1}$), using the ATLAS detector. Candidate $ZZ \rightarrow 4\ell$ events are selected in the three decay channels, $4e$, $2e2\mu$ and $4\mu$. The cross section of the $ZZ\rightarrow 4\ell$ process is measured …
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