Inverse problem in the thick-target method of measurements of inner-shell ionization cross sections by electron or positron impact

2008 ◽  
Vol 77 (4) ◽  
Author(s):  
Zhu An ◽  
Qing Hou
Keyword(s):  
Inverse Problem ◽  
Cross Sections ◽  
Thick Target ◽  
Positron Impact ◽  
Ionization Cross ◽  
Inner Shell Ionization ◽  
Ionization Cross Sections ◽  
Shell Ionization

Measurements of K-shell ionization cross sections of Fe, Ni, and Zn by 7–29 keV electron impact using the thick-target method

2020 ◽  
Vol 98 (10) ◽  
pp. 970-975
Author(s):  
L.X. Tian ◽  
C.C. Dai ◽  
Y.J. Liu
Keyword(s):  
Experimental Data ◽  
Electron Impact ◽  
Cross Sections ◽  
Thick Target ◽  
Tikhonov Regularization Method ◽  
Ionization Cross ◽  
Bremsstrahlung Photons ◽  
Ill Posed ◽  
Ionization Cross Sections ◽  
Shell Ionization

The measurements of K-shell ionization cross sections for Fe, Ni, and Zn were performed using 7–29 keV electron impact on thick targets. Monte Carlo simulations were employed to correct the effects due to the multiple-scattered electrons and bremsstrahlung photons as well as other secondary particles within the thick targets. The so-called Tikhonov regularization method was adopted to deal with the ill-posed inverse problem involved in the thick-target method. The experimental results were compared with the DWBA and PWBA-C-Ex predictions as well as existing experimental data from the literature. It is observed that our experimental data are in better agreement with the theoretical results based on the DWBA model developed by Bote et al.

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