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1.
It is shown that the most recent measurements of differential cross-section at small momentum transfers, integrated and total
cross-sections, and the slope of np elastic scattering from 100 to 400 GeV/c are successfully fitted by using the simple Regge
pole model proposed by the authors several years ago. 相似文献
2.
Recent measurements of differential and elastic cross-sections, slope parameters and ratios of the real and imaginary parts
of the forward scattering amplitudes for pion-proton elastic scattering at 200 GeV/c have been fitted by using a simple Regge
pole model with phenomenological residue functions. The computed results for total cross-sections have also been compared
with the experimental data. 相似文献
3.
S. V. Goloskokov S. P. Kuleshov O. V. Selyugin 《Zeitschrift fur Physik C Particles and Fields》1991,50(3):455-464
The spin-flip amplitudes of the meson-nucleon and nucleon-nucleon scattering are calculated in the framework of the dynamic model taking into account the interactions at large distances. The consideration of the strong form factors at the corresponding vertex and prea-symptotic contributions allowed us to describe correctly the differential cross sections and spin effects of hadron-hadron scattering at high energies. On this basis predictions at high and superhigh energies are made. 相似文献
4.
Regge pole plus cut model for proton-antiproton elastic scattering at collider and tevatron energies
The Regge pole plus cut model has been used to explain the data at the collider energies √s=546 and 630 GeV and the most recent differential cross-section results at √s=1.8 TeV. Predictions of the model at 1.8 and 40 TeV are compared with those of Bourrelyet al. 相似文献
5.
Abstract Brillouin scattering has been used to study methanol as a function of pressure up to 8.4 GPa. Our near-forward-scattering experiments yield the pressure dependence of the velocity of longitudinal acoustic (LA) phonons, while we determine the pressure dependence of the product of the index of refraction and the LA phonon velocity from our backscattering experiments. The pressure dependence of the LA phonon lifetimes is obtained from the linewidth of the measured Brillouin peaks. From our backscattering experiments we find that the normalized phonon attenuation is a decreasing function of pressure. 相似文献
6.
The Monte Carlo method is used to simulate the 12C+12C reaction process. Taking into account the size of the incident 12C beam spot and the thickness of the 12C target, the distributions of scattered 12C on the MWPC and the CsI detectors at a detective distance have been simulated. In order to separate elastic scattering from the inelastic scattering with 4.4 MeV excited energy, we set several variables: the kinetic energy of incident 12C, the thickness of the 12C target, the ratio of the excited state, the wire spacing of the MWPC, the energy resolution of the CsI detector and the time resolution of the plastic scintillator. From the simulation results, the preliminary establishment of the experiment system can be determined to be that the beam size of the incident 12C is φ 5 mm, the incident kinetic energy is 200-400 A MeV, the target thickness is 2 mm, the ratio of the excited state is 20%, the ight distance of scattered 12C is 3 m, the energy resolution of the CsI detectors is 1%, the time resolution of the plastic scintillator is 0.5%, and the size of the CsI detectors is 7 cm×7 cm, and we need at least 16 CsI detectors to cover a 0° to 5° angular distribution. 相似文献
7.
Igor Sharf Andrii Tykhonov Grygorii Sokhrannyi Maksym Deliyergiyev Natalia Podolyan Vitaliy Rusov 《Central European Journal of Physics》2012,10(4):858-887
We demonstrate a new method to calculate inelastic scattering cross-sections, which in contrary to the Regge-based methods takes into account the energy momentum conservation law. It is shown that the main contribution to integral expressing inelastic scattering cross-sections does not come from the multi-Regge domain. In particular, accounting for the longitudinal momenta contribution to virtualities is sufficient and results in the new mechanism of cross-section growth. The reasons for taking into account the sufficiently high number of interference contributions are shown and the approximate method for this purpose is developed. By fitting single free parameter of the model achieved a qualitative agreement of the total and inelastic cross sections with experimental data. 相似文献
8.
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10.
The average particle multiplicity density dN
ch/dη is the dynamical quantity that reflects some regularities of particle production in the low-p
T
range. The quantity is an important ingredient of z scaling. Experimental results on charged particle density are available for pp, pA, and AA collisions, while experimental properties of the jet density are still an open question. The goal of this work is to find
the variable that will reflect the main features of the jet production in a low transverse energy range and play the role
of the scale factor for the scaling function ψ(z) and variable z in data z-presentation. The appropriate candidate is the variable we called “scaled jet energy density.” The scaled jet energy density
is the probability of having a jet with defined E
T
in defined x
T
and pseudorapidity regions. The PYTHIA6.2 Monte Carlo generator is used for calculation of the scaled jet energy density
in proton-proton collisions over a high energy range
and at η = 0. The properties of the new variable are discussed and sensitivity to “physical scenarios” applied in the standard
Monte Carlo generator is noted. The results of the calculations of scaled jet energy density at LHC energies are presented
and compared with predictions based on z scaling.
The text was submitted by the authors in English. 相似文献
11.
Total and differential cross sections for high energy and small momentum transfer elastic hadron-hadron scattering are studied
in QCD using a functional integral approach. The hadronic amplitudes are governed by vacuum expectation values of lightlike
Wegner-Wilson loops, for which a matrix cumulant expansion is derived. The cumulants are evaluated within the framework of
the Minkowskian version of the model of the stochastic vacuum. Using the second cumulant, we calculate elastic differential
cross sections for hadron-hadron scattering. The agreement with experimental data is good.
Received: 3 September 1998 / Published online: 19 November 1998 相似文献
12.
Sunachand Patel 《Pramana》1985,25(6):685-694
Possible occurrence of scaling of differential cross-section for high energy hadronnucleus elastic scattering is demonstrated
takingp-4He scattering as an example and using three well-known scaling variables proposed earlier for hadron-hadron scattering. The
available data on differential cross-section ratio betweenE
lab=45 and 393 GeV are found to scale in all the three variables reasonably well and the positions of the dip and the secondary
maximum are found to follow the predicted patterns of behaviour as a function of energy. Extrapolating the fits to the available
slope-parameter data onto higher energies and using the scaling curves, the positions of the dip and the secondary maximum
and the differential cross-section ratio as a function of |t| are predicted for higher energies. 相似文献
13.
14.
The alpha-particle model has been applied to calculate the elastic and the 2+ inelastic angular distribution of 1 GeV protons on12C within the framework of Glauber multiple scattering theory. The results are compared with the recent experimental data and
with some previous calculations. The model gives a fairly good account of the inelastic data and its predictions for the elastic
scattering are essentially the same as those of the shell model. 相似文献
15.
The elastic scattering properties in a mixture of sodium and cesium atoms are investigated at cold and ultracold temperatures. Based on the accurate interatomic potential for the NaCs mixture, the interspecies s-wave scattering lengths, the effective ranges and the p-wave scattering lengths are calculated by the quantal method and the semiclassical method, respectively. The s-wave scattering lengths are 512.7a0 for the singlet state and 33.4a0 for the triplet state. In addition, the spin-change and elastic cross sections are also calculated, and the g-wave shape resonance is found in the total elastic cross sections. 相似文献
16.
A derivation by Byron of the Glauber wavefunction for inelastic scattering without the explicit introduction of the nonmoving bound particle assumption is shown in fact to have this restriction implicitly. 相似文献
17.
HU Zhao-Hui ZHOU Li-Juan MA Wei-Xing 《理论物理通讯》2008,49(3):729-738
Based on analysis of scattering matrix S, and its properties such as analyticity, unitarity, Lorentz invariance, and crossing symmetry relation, the Regge theory was proposed to describe hadron-hadron scattering at high energies before the advent of QCD, and correspondingly a Reggeon concept was born as a mediator of strongly interaction. This theory serves as a successful approach and has explained a great number of experimental data successfully, which proves that the Regge theory can be regarded as a basic theory of hadron interaction at high energies and its validity in many applications. However, as new experimental data come out, we have some difficulties in explaining the data. The new experimental total cross section violates the predictions of Regge theory, which shows that Regge formalism is limited in its applications to high energy data. To understand new experimental measurements, a new exchange theory was consequently born and its mediator is called Pomeron, which has vacuum quantum numbers. The new theory named as Pomeron exchange theory which reproduces the new experimental data of diffractive processes successfully. There are two exchange mediators: Reggeon and Pomeron. Reggeon exchange theory can only produce data at the relatively lower energy region, while Pomeron exchange theory fits the data only at higher-energy region, separately. In order to explain the data in the whole energy region, we propose a Reggeon-Pomeron model to describe high-energy hadron- hadron scattering and other diffractive processes. Although the Reggeon-Pomeron model is successful in describing high-energy hadron-hadron interaction in the whole energy region, it is a phenomenological model. After the advent of QCD, people try to reveal the mystery of the phenomenological theory from QCD since hadron-hadron processes is a strong interaction, which is believed to be described by QCD. According to this point of view, we study the QCD nature of Reggeon and Pomeron. We claim that the Reggeon exchange is an exchange of mult 相似文献
18.
The multiple scattering series of Glauber and Matthiae for hadron-nucleus scattering is summed to a simple analytical expression. It reproduces quantitatively the main features of the experimental cross section for the reaction at 1 GeV/nucleon. 相似文献
19.
The differential cross sections of elastic and inelastic scattering of ~3He ions on ~(13)C and ~(14)C have been studied at an energy of 37.9 MeV with a double folding model based on M3Y-Reid effective nucleon-nucleon interaction.The resulted parameters have been used for the standard Distorted Wave Born Approximation calculations of angular distributions corresponding to different excitations levels of ~(13)C and ~(14)C and deformation parameters have been deduced. 相似文献
20.