scholarly journals Absolute cross section measurements for the scattering of low- and intermediate-energy electrons from PF3. II. Inelastic scattering of vibrational and electronic excitations

2018 ◽  
Vol 148 (8) ◽  
pp. 084313 ◽  
Author(s):  
N. Hishiyama ◽  
M. Hoshino ◽  
F. Blanco ◽  
G. García ◽  
H. Tanaka
Keyword(s):  
Inelastic Scattering ◽  
Cross Section ◽  
Intermediate Energy ◽  
Absolute Cross Section ◽  
Electronic Excitations

scholarly journals New and Old Measurements of Electron Scattering in Atomic Hydrogen

1998 ◽  
Vol 51 (4) ◽  
pp. 633 ◽  
Author(s):  
J. F. Williams
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Atomic Hydrogen ◽  
Intermediate Energy ◽  
Absolute Calibration ◽  
Absolute Cross Section ◽  
Close Coupling ◽  
R Matrix ◽  
Correlation Parameters

A critical look is made of discrepancies and agreements between new and old measurements and theories for elastic and n = 2 excitation of atomic hydrogen by electron impact, mainly at 16·5, 54 and 100 eV. A discussion of earlier work indicates the contributions of Weigold and colleagues. The diffculties of observing and modelling small scattered fluxes at backward scattering angles and of making absolute cross section calibrations are noted. New measurements of elastic scattering at 16·5 eV confirm earlier measured angular distributions. An absolute calibration of the differential cross section at 16·5 eV gives agreement within one standard deviation with intermediate energy R-matrix and multi-pseudostate close coupling values. At 16·5 eV, measurements of the separate 2s and 2p differential cross sections and the lambda, R and I correlation parameters again support the values from those theories.

scholarly journals Excitation of the 9·50 MeV (9/2+) State of 13C in Intermediate Energy Scattering Experiments

1982 ◽  
Vol 35 (1) ◽  
pp. 9
Author(s):  
L Rickus ◽  
SF Collins ◽  
KA Amos ◽  
BM Spicer ◽  
GG Shute ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Angular Distribution ◽  
Differential Cross Section ◽  
Inelastic Scattering ◽  
Cross Section ◽  
Differential Cross ◽  
Total Angular Momentum ◽  
Intermediate Energy ◽  
Large Asymmetry ◽  
Mev Protons

The differential cross section for the inelastic scattering of 135 MeV protons leading to the9/2+ (9·5 MeV) state in 13C has been measured. Microscopic DWBA analyses show that the angular distribution is well described by a pure (or nearly pure) 1p3/2 to 1d5/2 neutron transition with a total angular momentum transfer of 4, a description which is consistent with the previously observed large asymmetry in inelastic π+ and π- scattering to this state.

Absolute inner-shell cross section determination for EELS analysis

1988 ◽  
Vol 46 ◽  
pp. 534-535
Author(s):  
P.A. Crozier
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Absolute Cross Section ◽  
Specimen Thickness ◽  
Mass Thickness ◽  
Scattering Cross ◽  
Before And After ◽  
Estimated Error ◽  
Scattering Cross Sections ◽  
Electron Microscopist

Absolute inelastic scattering cross sections or mean free paths are often used in EELS analysis for determining elemental concentrations and specimen thickness. In most instances, theoretical values must be used because there have been few attempts to determine experimental scattering cross sections from solids under the conditions of interest to electron microscopist. In addition to providing data for spectral quantitation, absolute cross section measurements yields useful information on many of the approximations which are frequently involved in EELS analysis procedures. In this paper, experimental cross sections are presented for some inner-shell edges of Al, Cu, Ag and Au.Uniform thin films of the previously mentioned materials were prepared by vacuum evaporation onto microscope cover slips. The cover slips were weighed before and after evaporation to determine the mass thickness of the films. The estimated error in this method of determining mass thickness was ±7 x 107g/cm2. The films were floated off in water and mounted on Cu grids.

scholarly journals Saturation effects in SIDIS at very forward rapidities

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
E. Iancu ◽  
A. H. Mueller ◽  
D. N. Triantafyllopoulos ◽  
S. Y. Wei
Keyword(s):  
Inelastic Scattering ◽  
Cross Section ◽  
Cross Sections ◽  
Virtual Photon ◽  
Large Fraction ◽  
Quark Distribution ◽  
High Energy ◽  
Longitudinal Momentum ◽  
Black Disk ◽  
Gluon Saturation

Abstract Using the dipole picture for electron-nucleus deep inelastic scattering at small Bjorken x, we study the effects of gluon saturation in the nuclear target on the cross-section for SIDIS (single inclusive hadron, or jet, production). We argue that the sensitivity of this process to gluon saturation can be enhanced by tagging on a hadron (or jet) which carries a large fraction z ≃ 1 of the longitudinal momentum of the virtual photon. This opens the possibility to study gluon saturation in relatively hard processes, where the virtuality Q2 is (much) larger than the target saturation momentum $$ {Q}_s^2 $$ Q s 2 , but such that z(1 − z)Q2 ≲ $$ {Q}_s^2 $$ Q s 2 . Working in the limit z(1 − z)Q2 ≪ $$ {Q}_s^2 $$ Q s 2 , we predict new phenomena which would signal saturation in the SIDIS cross-section. For sufficiently low transverse momenta k⊥ ≪ Qs of the produced particle, the dominant contribution comes from elastic scattering in the black disk limit, which exposes the unintegrated quark distribution in the virtual photon. For larger momenta k⊥ ≳ Qs, inelastic collisions take the leading role. They explore gluon saturation via multiple scattering, leading to a Gaussian distribution in k⊥ centred around Qs. When z(1 − z)Q2 ≪ Q2, this results in a Cronin peak in the nuclear modification factor (the RpA ratio) at moderate values of x. With decreasing x, this peak is washed out by the high-energy evolution and replaced by nuclear suppression (RpA< 1) up to large momenta k⊥ ≫ Qs. Still for z(1 − z)Q2 ≪ $$ {Q}_s^2 $$ Q s 2 , we also compute SIDIS cross-sections integrated over k⊥. We find that both elastic and inelastic scattering are controlled by the black disk limit, so they yield similar contributions, of zeroth order in the QCD coupling.

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