Calculation of the Cross Section for C iv-H Charge Exchange: Significance for Interstellar X-Rays Particles

1976 ◽  
Vol 205 ◽  
pp. 634 ◽  
Author(s):  
R. J. Blint ◽  
W. D. Watson ◽  
R. B. Christensen
Keyword(s):  
Cross Section ◽  
Charge Exchange ◽  
X Rays ◽  
The Cross

scholarly journals Über die Rezeptorsubstanz für den Phagen T5 V. Das rezeptoraktive Areal

1960 ◽  
Vol 15 (1) ◽  
pp. 34-37 ◽  
Author(s):  
Wolfhard Weidel ◽  
Jürgen Homann
Keyword(s):  
Cross Section ◽  
Dose Response ◽  
Active Site ◽  
X Rays ◽  
Binding Reaction ◽  
Phage Tail ◽  
Rapid Inactivation ◽  
The Cross

Highly purified T 5-receptor substance was irradiated with X-rays, and a one-hit dose response was obtained. By comparing quantitatively the results of two independent tests, both of which measure “survival“ of receptor after irradiation, it was possible to conclude that the receptor-active site of one receptor particle must be larger than the cross-section of a T 5-phage tail. However, since receptor particles were never definitely observed to have combined with more than one T 5-particle, secondary processes must be involved in the binding reaction, leading to a rapid inactivation of any surplus receptor-active areas on the receptor particle undergoing the reaction.

Dependence of the cross section for inclusive pion double charge exchange on nuclear mass and charge

1989 ◽  
Vol 62 (16) ◽  
pp. 1837-1839 ◽  
Author(s):  
P. A. M. Gram ◽  
S. A. Wood ◽  
E. R. Kinney ◽  
S. Høibråten ◽  
P. Mansky ◽  
...  
Keyword(s):  
Cross Section ◽  
Charge Exchange ◽  
Nuclear Mass ◽  
Double Charge Exchange ◽  
The Cross ◽  
Double Charge

An Algorithm for the Description of White and Characteristic Tube Spectra (11 ≤ Z ≤ 83, 10keV ≤ Eo ≤ 50keV)

1991 ◽  
Vol 35 (B) ◽  
pp. 721-726 ◽  
Author(s):  
H. Ebel ◽  
H. Wiederschwinger ◽  
J. Wernisch ◽  
P.A. Pella
Keyword(s):  
Kinetic Energy ◽  
Cross Section ◽  
Atomic Number ◽  
Solid Angle ◽  
Electron Interaction ◽  
X Rays ◽  
X Ray ◽  
The Cross ◽  
Spectral Responses ◽  
The Continuum

Kramers described the cross section of electron interaction with target atoms of atomic number Z bywhere Eo is the kinetic energy of impinging electrons, and E o S) the energy of x-ray photons of the continuum, Smith et al modified this equation, introducing an exponent x, so thatWe applied the cross-section σS, E to the evaluation of experimental results. The evaluation of the measured spectral responses of the x-ray signals nE was performed bywhere f(deff) describes the absorption of x-rays of energy E in the target, RE accounts for backscattering of electrons, DE quantifies the efficiency of x-ray detection within the solid angle Ω.

First measurement of the cross-section ratioR dp(0) in charge-exchange (np) reactions on H2/D2 at 0o andT n = 1 GeV Dubna “Delta-Sigma experiment”

2005 ◽  
Vol 55 (S1) ◽  
Author(s):  
A. A. Morozov ◽  
V. G. Antonenko ◽  
S. B. Borzakov ◽  
Yu. T. Borzunov ◽  
E. V. Chernykh ◽  
...  
Keyword(s):  
Cross Section ◽  
Charge Exchange ◽  
Delta Sigma ◽  
The Cross

Cross section of the reaction 9Be(γ, n) near threshold

1982 ◽  
Vol 60 (11) ◽  
pp. 1672-1677 ◽  
Author(s):  
M. Fujishiro ◽  
T. Tabata ◽  
K. Okamoto ◽  
T. Tsujimoto
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Valence Neutron ◽  
Sharp Peak ◽  
X Rays ◽  
The Cross ◽  
Near Threshold

Six kinds of radioisotopes were used to measure cross sections of the 9Be(γ, n) reaction near its threshold. The results obtained were 0.88 ± 0.16, 1.33 ± 0.24, 1.10 ± 0.20, 0.73 ± 0.13, 0.47 ± 0.09, and 0.18 ± 0.04 mb at 1674.7, 1705.2, 1724.9, 1778.9, 1836.0, and 2167.6 keV, respectively. The cross sections measured show a sharp peak near the threshold, and its width is narrower than that observed by Jakobson with Bremsstrahlung X-rays. Comparison of the present results with theories based on the valence neutron model indicates that the agreement is only qualitative.

scholarly journals Laser Assisted Charge Exchange in Atomic Collisions

1991 ◽  
Vol 11 (3-4) ◽  
pp. 285-290 ◽  
Author(s):  
J. F. Castillo ◽  
L. F. Errea ◽  
L Méndez ◽  
A. Riera
Keyword(s):  
Cross Section ◽  
Charge Exchange ◽  
Cross Sections ◽  
Laser Field ◽  
Laser Wavelength ◽  
Total Charge ◽  
Atomic Collisions ◽  
Radiative Transitions ◽  
The Cross ◽  
Impact Energies

We present total charge exchange cross sections for collisions of Li(1s22s2S) with H(1s) in presence of a linear polarized laser field of intensity 0.05 ≤ I ≤ 1 TW/cm2 and wavelength 5 103 ≤ λ ≤ 14 103 Å. Our calculation shows that the laser field can increase the cross section of this reaction by a factor of ten at impact energies E < 0.1 ke V/a.m.u. The mechanism of this process is discussed and it is shown that both atomic and molecular radiative transitions can take place depending on the laser wavelength employed.

Ladungsaustausch zwischen Ionen und Atomen der Edelgase bei Stoßenergien unterhalb 200 eV

1969 ◽  
Vol 24 (11) ◽  
pp. 1716-1720
Author(s):  
H. Schlumbohm
Keyword(s):  
Cross Section ◽  
Charge Exchange ◽  
Cross Sections ◽  
Collision Energy ◽  
Threshold Energy ◽  
Strong Increase ◽  
Published Data ◽  
Slow Ions ◽  
Endothermic Process ◽  
The Cross

Charge exchange cross sections for the four systems He+, Ne+ + Ar, Kr have been measured, ap­plying slow ions gathering techniques. The values are several 1O-16 cm2 and are almost constant between 20 and 200 eV collision energy. The comparison with previously published data for charge exchange into optically excited higher states of the ions show that these reactions prefer at least at 25 to 30% endothermic channels instead of the exothermic one without excitation. - Additionally the cross section of the endothermic process Ar++Ne was measured. Above a threshold energy of 17 eV it shows a strong increase and a constant value of 7 · 10-17 cm2 between 20 and 200 eV.

Regge Pole Plus Background Model of Backward πp Scattering

1974 ◽  
Vol 52 (13) ◽  
pp. 1155-1159
Author(s):  
S. Kogitz ◽  
R. K. Logan
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Charge Exchange ◽  
Differential Cross ◽  
Regge Pole ◽  
Background Model ◽  
Cross Section Data ◽  
Section Data ◽  
The Cross ◽  
Exchange Scattering

We present a model of backward π+p, π−p, and π−p charge exchange scattering consistent with our earlier approach to forward π−p charge exchange and backward π+p. We consider two body differential cross section data which exhibits a dip–bump structure as well as nonzero polarization. This is explained in terms of a dominant Regge pole vanishing at the dip accompanied by a background. The background is primarily responsible for the large u behavior of the cross section which includes the rise after the dip. It is assumed that the presence of nonzero polarization dictates this behavior. We isolate the I = 3/2 amplitude in π−p backwards and determine the I = 1/2 amplitude from π+p backwards. A prediction for π−p → nπ0 follows.

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