The determination of the total excitation cross section in neon by comparison of theoretical and experimental values of Townsend's primary ionization coefficient

1969 ◽  
Vol 2 (5) ◽  
pp. 551-561 ◽  
Author(s):  
W R L Thomas
Keyword(s):  
Cross Section ◽  
Excitation Cross Section ◽  
Ionization Coefficient ◽  
Experimental Values ◽  
Primary Ionization

The determination of the cross sections for the reactions 27 Al( n , α ) and 56 Fe( n , p ) for 14 MeV neutrons by an absolute method

1966 ◽  
Vol 292 (1429) ◽  
pp. 180-192 ◽  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Standard Error ◽  
Particle Method ◽  
Systematic Errors ◽  
Aluminium Foil ◽  
The Mean ◽  
The Cross ◽  
Experimental Values

Measurements of the cross sections for the reactions 27 Al( n , α ) 24 Na and 56 Fe( n, p ) 56 Mn for neutrons of energy 13.5 ± 0.1 MeV have been made by a radioactivation method. The neutron flux was determined by a variant of the 'associated particle’ method, in which the α -particles produced concurrently with the neutrons from the D + T reaction were estimated in terms of the volume of helium which accumulated when they were brought to rest in an aluminium foil. Cross section values obtained at 13.5 MeV were: for 27 Al( n , α ): 118.1 ± 6.0 mb : for 56 Fe( n, p ): 106.7 ± 4.7 mb. The errors quoted include both the standard error on the mean of the experimental values and an estimate of possible residual systematic errors. The excitation functions for both reactions in the energy region 13.5 to 14.8 MeV have also been investigated, in order to provide secondary cross section values over this range of energies. At 14.8 MeV the values found were: 27 Al( n , α )103.6 ± 5.5 mb; 56 Fe( n, p )96.7 ± 4.5 mb.

Correlation between Si-related and erbium photoluminescence bands and determination of erbium effective excitation cross section in SiO2 films

2005 ◽  
Vol 98 (1) ◽  
pp. 013544 ◽  
Author(s):  
C.-C. Kao ◽  
C. Barthou ◽  
B. Gallas ◽  
S. Fisson ◽  
G. Vuye ◽  
...  
Keyword(s):  
Cross Section ◽  
Excitation Cross Section ◽  
Sio2 Films ◽  
Effective Excitation

Measurement of Excitation Cross-Sections for Electron Impact at low Densities of Target Atoms

1973 ◽  
Vol 28 (11) ◽  
pp. 1871-1872 ◽  
Author(s):  
F. Karstensen ◽  
J. Pohl
Keyword(s):  
Electron Impact ◽  
Cross Section ◽  
Cross Sections ◽  
Atomic Beam ◽  
Excitation Cross Section ◽  
Particle Density ◽  
Measured Cross Section ◽  
Beam Experiment ◽  
Excitation Cross Sections

In a crossed-beam experiment Na atoms are excited by electron impact with an energy of 11 eV. Determination of the excitation cross-section for the D-lines shows an increase of the measured cross-section with decreasing particle density in the atomic beam below 1012 cm-3.

Determination of the excitation cross section of photoluminescence from an Er ion in the case of homogeneous and inhomogeneous optical excitation

2012 ◽  
Vol 46 (11) ◽  
pp. 1372-1375 ◽  
Author(s):  
B. A. Andreev ◽  
Z. F. Krasilnik ◽  
D. I. Kryzhkov ◽  
V. P. Kuznetsov ◽  
A. N. Yablonskiy
Keyword(s):  
Cross Section ◽  
Excitation Cross Section ◽  
Optical Excitation
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