Total Scattering Cross Section of Solids for Cold and Epithermal Neutrons

1984 ◽  
Vol 39 (12) ◽  
pp. 1160-1167 ◽  
Author(s):  
J. R. Granada
Keyword(s):  
Experimental Data ◽  
Solid State ◽  
Total Cross Section ◽  
Cross Section ◽  
Epithermal Neutron ◽  
Debye Model ◽  
Effect Of Temperature ◽  
Epithermal Neutrons ◽  
Total Scattering Cross Section ◽  
Asymptotic Forms

Simple expressions are given which accurately describe the total cross section of solids at cold and epithermal neutron energies. They are intended to provide a consistent procedure for the evaluation of solid state effects, which must be substracted from the experimental data when information is wanted on intrinsic nuclear properties. The formulae presented here are the asymptotic forms to which the full expressions reduce in those energy limits. A Debye model is adopted to describe the frequency spectrum of the solid. The present results are compared with some commonly used expressions as well as with the exact formalism. The effect of temperature is discussed and numerical calculations are presented for some cases.

Total Cross Section of Sulphur at Slow Neutron Energies

1987 ◽  
Vol 42 (8) ◽  
pp. 791-793
Author(s):  
R. E. Mayer ◽  
V. H. Gillette ◽  
J. R. Granada
Keyword(s):  
Total Cross Section ◽  
Cross Section ◽  
Epithermal Neutron ◽  
Scattering Length ◽  
Slow Neutron ◽  
Electron Interaction ◽  
Transmission Experiment ◽  
Nucleus Scattering ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source

The total cross section of elemental Sulphur was measured at neutron energies between 1.6 x 10-3 eV and 100 eV, using a pulsed neutron source and time-of-flight techniques. The data in the epithermal neutron region were used to extract the value of the bound nucleus scattering length, taking into account the neutron-electron interaction. A similar transmission experiment was also performed on elemental Bismuth.

Neutron transmission of single-crystal magnesium fluoride

2008 ◽  
Vol 41 (6) ◽  
pp. 1003-1008 ◽  
Author(s):  
J. G. Barker ◽  
D. F. R. Mildner ◽  
J. A. Rodriguez ◽  
P. Thiyagarajan
Keyword(s):  
Total Cross Section ◽  
Single Crystal ◽  
Thermal Neutron ◽  
Cross Section ◽  
Room Temperature ◽  
Magnesium Fluoride ◽  
Neutron Transmission ◽  
Epithermal Neutrons ◽  
Neutron Attenuation ◽  
Thermal Neutron Beam

The neutron attenuation through single-crystal magnesium fluoride has been measured as a function of wavelength at both room temperature and 77 K. These data confirm a total cross section that is lower than that of MgO for wavelengths greater than 0.2 nm. MgF2cooled to 77 K is a slightly better filter of epithermal neutrons than MgO for obtaining a thermal neutron beam.

STUDY OF BFKL GLUON DYNAMICS IN HEAVY QUARKONIUM PHOTOPRODUCTION AT HERA

2000 ◽  
Vol 15 (10) ◽  
pp. 695-707 ◽  
Author(s):  
A. V. LIPATOV ◽  
N. P. ZOTOV
Keyword(s):  
Experimental Data ◽  
Total Cross Section ◽  
Cross Section ◽  
Gluon Distribution ◽  
Heavy Quarkonium ◽  
Unintegrated Gluon ◽  
Gluon Distributions ◽  
Theoretical Results

In the framework of semihard QCD approach we consider the processes of inelastic heavy quarkonium photoproduction at HERA with emphasis on the BFKL dynamics of gluon distributions. We investigate the dependences of the total cross-section of inelastic J/Ψ photoproduction and also pT and z spectra on different forms of the unintegrated gluon distribution. It is shown that the total cross-section is most sensitive to the Pomeron intercept parameter Δ. We compare the theoretical results with the available H1 and ZEUS experimental data.

scholarly journals A study of the process e+ + e−→ e+ + e− + p + p̄ by the two-photon mechanism γγ → pp̄ at high energies

2017 ◽  
Vol 32 (18) ◽  
pp. 1750104 ◽  
Author(s):  
Azad I. Ahmadov
Keyword(s):  
Experimental Data ◽  
Total Cross Section ◽  
Cross Section ◽  
Beam Energy ◽  
Center Of Mass ◽  
Proton Antiproton ◽  
Exclusive Production ◽  
Two Photon ◽  
High Energies ◽  
Energy Formula

In this paper, we consider the exclusive production of proton–antiproton pairs in the interaction between two quasireal photons in [Formula: see text] collision. The differential and total cross-section of the process [Formula: see text] at a beam energy of photons from 2.1 GeV to 4.5 GeV in the center-of-mass and for different values of [Formula: see text] is calculated. At energy [Formula: see text] the total cross-section process of the [Formula: see text] is calculated by the two-photon mechanism. The results are in satisfactory agreement with the experimental data.

scholarly journals SUPERCRITICAL POMERON AND EIKONAL REPRESENTATION OF THE DIFFRACTION SCATTERING AMPLITUDE

1995 ◽  
Vol 10 (26) ◽  
pp. 1959-1967
Author(s):  
S.V. GOLOSKOKOV ◽  
S.P. KULESHOV ◽  
O.V. SELYUGIN
Keyword(s):  
Experimental Data ◽  
Scattering Amplitudes ◽  
Total Cross Section ◽  
Cross Section ◽  
Scattering Amplitude ◽  
Diffraction Scattering ◽  
Eikonal Representation ◽  
The One ◽  
Qcd Pomeron ◽  
Logarithmic Growth

The intercept of the supercritical pomeron is examined with the use of different forms of the scattering amplitudes of the bare pomeron. The one-to-one correspondence between the eikonal phase and the ratio of the elastic and total cross-section is shown. Based on new experimental data of the CDF collaboration, the intercept and power of the logarithmic growth of the bare and total pomeron amplitude are analyzed. It is shown that as a result of the eikonalization procedure, the bare QCD pomeron becomes compatible with experiment.

STRUCTURELESS COMPOSITENESS AND THE LEP W+W- DATA

1998 ◽  
Vol 13 (36) ◽  
pp. 2903-2907
Author(s):  
E. H. LEMKE
Keyword(s):  
Experimental Data ◽  
Phase Space ◽  
Total Cross Section ◽  
Cross Section ◽  
Quantum Mechanical ◽  
Final State ◽  
Space Factor ◽  
Mechanical Interference ◽  
Phase Space Factor ◽  
Rule Out

We specify the electroweak scenario of structureless compositeness (SC) put forward previously to the case of identical masses m(W±)=m(Φ±) and m(Z)=m(Φ0). The resulting quantum-mechanical interference will exhibit a vector–scalar phase interlocking of exactly π. We calculate the total cross-section of e+e-→ W+W- in this scenario and compare with the SM. The experimental data is found not to rule out any of the four scenarios SM, κ an =0, SC at κ=1 and 0. Pronounced differences between these four cases show up for the σ tot contribution of the W L W L final state. The effects are illustrated in plots free of the trivial phase-space factor.

scholarly journals Inelastic cross sections in relativistic deuterons on Lead reactions

2020 ◽  
Vol 19 ◽  
pp. 81
Author(s):  
M. Zamani ◽  
S. Stoulos ◽  
M. Fragopoulou ◽  
M. Krivopustov
Keyword(s):  
Experimental Data ◽  
Solid State ◽  
Attenuation Coefficient ◽  
Cross Section ◽  
Cross Sections ◽  
Inelastic Cross Section ◽  
Lead Target ◽  
Spallation Neutron Source ◽  
Interaction Length ◽  
Beam Attenuation

The inelastic cross section of deuterons hitting a Lead target has been determined by the beam attenuation technique. A spallation neutron source based on Lead target has been irradiated with 1.6 and 2.5 GeV deuterons. Solid state nuclear track detectors as well as the activation method were used in order to obtain the neutron and proton distribution along the surface of the source. The attenuation coefficient was estimated by fitting the experimental data taking into account the build up effect and the beam attenuation. Using the attenuation coefficient, the interaction length and then the inelastic cross section of deuterons on Lead reaction have been determined.

Application of genetic programming for proton-proton interactions

Open Physics ◽  
2011 ◽  
Vol 9 (3) ◽  
Author(s):  
EL-Sayed El-Dahshan
Keyword(s):  
Experimental Data ◽  
Genetic Programming ◽  
Total Cross Section ◽  
Cross Section ◽  
Multiplicity Distribution ◽  
Center Of Mass ◽  
Average Multiplicity ◽  
Machine Learning Techniques ◽  
Center Of Mass Energy ◽  
Charged Pions

AbstractThe aim of the present work is to use one of the machine learning techniques named the genetic programming (GP) to model the p-p interactions through discovering functions. In our study, GP is used to simulate and predict the multiplicity distribution of charged pions (P(n ch)), the average multiplicity (〈n ch〉) and the total cross section (σ tot) at different values of high energies. We have obtained the multiplicity distribution as a function of the center of mass energy ($$ \sqrt s $$) and charged particles (n ch). Also, both the average multiplicity and the total cross section are obtained as a function of $$ \sqrt s $$. Our discovered functions produced by GP technique show a good match to the experimental data. The performance of the GP models was also tested at non-trained data and was found to be in good agreement with the experimental data.

scholarly journals HEAVY QUARK PHOTOPRODUCTION IN THE SEMIHARD QCD APPROACH AND THE UNINTEGRATED GLUON DISTRIBUTION

2000 ◽  
Vol 15 (28) ◽  
pp. 1727-1738 ◽  
Author(s):  
A. V. LIPATOV ◽  
V. A. SALEEV ◽  
N. P. ZOTOV
Keyword(s):  
Experimental Data ◽  
Total Cross Section ◽  
Heavy Quark ◽  
Cross Section ◽  
Gluon Distribution ◽  
Unintegrated Gluon ◽  
Gluon Distributions ◽  
Theoretical Results

Processes of heavy quark photoproduction at HERA energies are considered using the semihard (k⊥ factorization) QCD approach with emphasis of the BFKL dynamics of gluon distributions. We investigate the dependences of the total cross-section of heavy quark photoproduction and also the pT distribution on different forms of the unintegrated gluon distribution. We present a comparison of the theoretical results with available H1 and ZEUS experimental data for charm and beauty photoproductions.

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