Measurement of cross sections and asymmetry parameters for the production of charged pions from various nuclei by 585-MeV protons

1980 ◽  
Vol 22 (3) ◽  
pp. 1184-1196 ◽  
Author(s):  
J. F. Crawford ◽  
M. Daum ◽  
G. H. Eaton ◽  
R. Frosch ◽  
H. Hirschmann ◽  
...  
Keyword(s):  
Cross Sections ◽  
Charged Pions ◽  
Asymmetry Parameters ◽  
Mev Protons

SPALLATION YIELDS FROM HIGH ENERGY PROTON BOMBARDMENT OF HEAVY ELEMENTS

1957 ◽  
Vol 35 (1) ◽  
pp. 21-37 ◽  
Author(s):  
J. D. Jackson
Keyword(s):  
Cross Sections ◽  
High Energy ◽  
Heavy Elements ◽  
Collective Effects ◽  
Comparison With Experiment ◽  
Energy Proton ◽  
Stringent Test ◽  
Neutron Evaporation ◽  
Nuclear Processes ◽  
Mev Protons

The Monte Carlo calculations of McManus and Sharp (unpublished) for the prompt nuclear processes occurring upon bombardment of heavy elements by 400 Mev. protons are combined with a description of the subsequent neutron evaporation to determine spallation cross sections for comparison with experiment. The model employed is a schematic one which suppresses the detailed characteristics of individual nuclei, but gives the over-all behavior to be expected. Many-particle and collective effects such as alpha particle emission and fission are ignored. The computed cross sections are presented in a variety of different graphical forms which illustrate quantitatively the qualitative picture of high energy reactions first given by Serber (1947). The calculations are in general agreement with existing data when fission is not an important effect, but the agreement does not imply a very stringent test of the various features of the model.

scholarly journals Absolute cross sections and asymmetry parameters for photodetachment of C−(4So)

2021 ◽  
Vol 103 (2) ◽  
Author(s):  
Raphaël Marion ◽  
Kevin M. Dunseath ◽  
Mariko Terao-Dunseath ◽  
Xavier Urbain
Keyword(s):  
Cross Sections ◽  
Asymmetry Parameters

Photoionization Cross Sections and Asymmetry Parameters for the Valence Shell of Methanol

2012 ◽  
Vol 116 (48) ◽  
pp. 11913-11919 ◽  
Author(s):  
C. Lavín ◽  
M. V. Vega ◽  
A. M. Velasco
Keyword(s):  
Cross Sections ◽  
Valence Shell ◽  
Asymmetry Parameters

Measurements of Displacement Cross Section of Tungsten under 389-MeV Proton Irradiation and Thermal Damage Recovery

2021 ◽  
Vol 1024 ◽  
pp. 95-101
Author(s):  
Yosuke Iwamoto ◽  
Makoto Yoshida ◽  
Hiroki Matsuda ◽  
Shin Ichiro Meigo ◽  
Daiki Satoh ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Thermal Conduction ◽  
Thermal Damage ◽  
Proton Irradiation ◽  
High Energy ◽  
Wire Sample ◽  
Energy Proton ◽  
Measured Displacement ◽  
Mev Protons

For validating the number of displacements per atom (dpa) for tungsten under high-energy proton irradiation, we measured displacement cross sections related to defect-induced electrical resistivity changes in a tungsten wire sample under irradiation with 389-MeV protons under 10 K. The Gifford–McMahon cryocooler was used to cool the sample using a conductive coolant via thermal conduction plates of oxygen-free high-conductivity copper and electrical insulation sheets of aluminum nitride ceramic. In this experiment, the displacement cross section was 1612 ± 371 b for tungsten at 389 MeV. A comparison of the experimental displacement cross sections of tungsten with the calculated results obtained using Norgett–Robinson–Torrens (NRT) dpa and athermal recombination-corrected (arc) dpa cross sections indicates that arc-dpa was in better agreement with the experimental data than NRT-dpa; this is similar to the displacement cross sections of copper. From the measurements of damage recovery of the accumulated defects in tungsten through isochronal annealing, which is related to the defect concentration of the sample, approximately 20% of the damage was recovered at 60 K. This trend was similar to those observed in other experimental results for reactor neutrons.

Cross Sections and Asymmetry Parameters for Formic Acid in the Vacuum-Ultraviolet Energy Range

2020 ◽  
Vol 124 (32) ◽  
pp. 6478-6485
Author(s):  
M. M. Fujimoto ◽  
H. K. Tanaka ◽  
R. R. T. Marinho ◽  
A. Medina ◽  
F. V. Prudente ◽  
...  
Keyword(s):  
Formic Acid ◽  
Energy Range ◽  
Cross Sections ◽  
Vacuum Ultraviolet ◽  
Ultraviolet Energy ◽  
Asymmetry Parameters

scholarly journals FORMATION OF 7Be IN NUCLEAR REACTIONS INDUCED BY 85-MeV PROTONS

1966 ◽  
Vol 44 (22) ◽  
pp. 2749-2767 ◽  
Author(s):  
M. S. Lafleur ◽  
N. T. Porile ◽  
L. Yaffe
Keyword(s):  
Cross Sections ◽  
Nuclear Reactions ◽  
Mev Protons ◽  
Good Agreement

Cross sections were measured for the formation of 7Be in targets bombarded with 85-MeV protons. The variation of these cross sections with the mass and neutron-to-proton ratio of the target was investigated.Cross-section calculations were performed on the assumption that 7Be is emitted from the irradiated target as an evaporated particle. Calculated and measured cross sections were in good agreement for medium and heavy targets (A > 55). The calculation underestimated the production of' 7Be in light targets (27 < A < 55).

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