Partial photoionization cross sections of large mercury clusters and liquid mercury in the vacuum ultraviolet photon energy region

1991 ◽  
Vol 19 (1-4) ◽  
pp. 227-228 ◽  
Author(s):  
B. Kaiser ◽  
K. Rademann
Keyword(s):  
Photon Energy ◽  
Cross Sections ◽  
Energy Region ◽  
Vacuum Ultraviolet ◽  
Liquid Mercury

On discrepancies in atomic photoeffect cross sections in the low photon energy region

2000 ◽  
Vol 53 (4-5) ◽  
pp. 949-952 ◽  
Author(s):  
V.R.K Murty ◽  
K.R.S Devan ◽  
D.P Winkoun
Keyword(s):  
Photon Energy ◽  
Cross Sections ◽  
Energy Region

scholarly journals A Comprehensive Study on Gamma-Ray Exposure Build-Up Factors and Fast Neutron Removal Cross Sections of Fly-Ash Bricks

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Vishwanath P. Singh ◽  
N. M. Badiger
Keyword(s):  
Fly Ash ◽  
Fast Neutron ◽  
Photon Energy ◽  
Cross Sections ◽  
Energy Region ◽  
Gamma Ray ◽  
Region Of Interest ◽  
Chemical Compositions ◽  
Shielding Effectiveness ◽  
Penetration Depths

Geometric progression (GP) method was utilized to investigate gamma-ray exposure build-up factors of fly-ash bricks for energies from 0.015 to 15 MeV up to 40 mfp penetration depth. The EBFs of the fly-ash bricks are dependent upon the photon energy, penetration depths, and the chemical compositions of the elements. Appreciable variations in exposure build-up factor (EBF) are noted for the fly-ash bricks. The EBFs were found to be small in low and high photon energy regions whereas very large in medium energy region. EBF of the bricks is inversely proportional to equivalent atomic number below 10 mfp for entire energy region of interest 0.015 to 15 MeV. The EBFs of fly-ash, brick of mud, and common brick were similar at 1.5 MeV photon energy. The EBF of the fly-ash bricks was found to be higher than that of the brick of mud, and common brick. The fast neutron removal cross sections of the fly-ash bricks, brick of mud, and common bricks were also calculated which were found to be in the same order. It is expected that this study should be very directly useful for shielding effectiveness of fly-ash brick materials and dose estimation.

Angular distributions and cross sections of the photoneutron reaction in 9Be in the photon energy region 18–26 MeV

1977 ◽  
Vol 55 (4) ◽  
pp. 364-369 ◽  
Author(s):  
A. Buchnea ◽  
R. G. Johnson ◽  
K. G. McNeill
Keyword(s):  
Cross Section ◽  
Photon Energy ◽  
Cross Sections ◽  
Energy Region ◽  
Angular Distributions ◽  
Photoneutron Reaction ◽  
Integrated Cross Section

The 9Be(γ,n0)8Be and 9Be(γ,n1)8Be reactions were studied in the photon energy region 18 to 26 MeV. The integrated cross section of the (γ,n0) reaction was found to be less than 0.1 MeV mb in this energy region. The integrated cross section for the (γ,n1) reaction in the energy region is 2.4 ± 0.4 MeV mb, which is 10 to 15% of the total photoneutron cross section. The measured angular distributions for the (γ,n1) reaction are consistent with the population of 3/2+ and 5/2+ states of 9Be. These results are consistent with slightly re-interpreted predictions of Majling, Kukulin, and Smirnov.

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