THE PHOTONEUTRON CROSS SECTIONS OF Rb87, Zr90, AND Mo92

1953 ◽  
Vol 31 (2) ◽  
pp. 250-261 ◽  
Author(s):  
L. Katz ◽  
R. G. Baker ◽  
R. Montalbetti
Keyword(s):  
Photon Energy ◽  
Cross Sections ◽  
Ground States ◽  
Half Maximum ◽  
Photonuclear Reactions ◽  
Shape Characteristic ◽  
Elementary Analysis ◽  
The Cross

The photoneutron cross sections of the 50-neutron isotopes Rb87, Zr90, and Mo92 have been measured as a function of photon energy. These cross sections exhibit the peaked shape characteristic of photonuclear reactions. Peak values of 0.23, 0.27, and 0.14 barn at 17.5, 18.0, and 18.7 Mev. respectively were found for these nuclei. The widths of all the curves at half maximum were about 6 Mev. In the case of zirconium and molybdenum the cross sections to the isomeric and ground states of the residual nuclei have been determined separately. The ratio of the cross sections, σ ground/σ isomeric, has been examined as a function of photon energy and is discussed in the light of the elementary analysis previously presented.

THE PHOTONEUTRON CROSS SECTIONS FOR THE REACTIONS Br81 (γ,n) Br80 AND Br81 (γ,n) Br80* AND AN ANALYSIS OF THE RATIO BETWEEN THESE CROSS SECTIONS

1952 ◽  
Vol 30 (5) ◽  
pp. 476-487 ◽  
Author(s):  
L. Katz ◽  
L. Pease ◽  
H. Moody
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Point Of View ◽  
Photonuclear Reactions ◽  
Shape Characteristic ◽  
Elementary Analysis ◽  
Different Types ◽  
The Cross

Cross-section curves have been measured as a function of energy for the reactions Br81(γ,n)Br80 and Br81(γ,n)Br80* and the ratio between these cross sections has been examined critically. The curves exhibit the peaked shape characteristic of photonuclear reactions with maximum cross sections of 88 and 42 millibarns respectively. It is shown that the ratio of the cross sections depends on the spins of the excited levels in which the Br80 nucleus is left prior to γ cascading and thus on the reaction leading to it. An elementary analysis based on this point of view gives results consistent with the ratio measured for six different types of reactions.

Photodetachment bei einigen zweiatomigen negativen Hydridionen: BeH–, MgH-, CaH-, ZnH-, PH-, AsH- / Photodetachment of Some Diatomic Negative Hydride Ions BeH-, MgH-, CaH-, ZnH-, PH-, AsH-

1977 ◽  
Vol 32 (6) ◽  
pp. 594-599 ◽  
Author(s):  
R. Rackwitz ◽  
D. Feldmann ◽  
H. J. Kaiser ◽  
E. Heinicke
Keyword(s):  
Energy Range ◽  
Photon Energy ◽  
Cross Sections ◽  
Photon Energy Range ◽  
Electron Affinities ◽  
The Cross ◽  
Hydride Ions ◽  
Threshold Energies

Abstract The cross sections have been measured in a photon energy range between 0.5 eV and 3 eV. From threshold energies the electron affinities of the molecules have been determined.

Photodetachment bei einigen negativen Molekülionen: P2–, As2-, CH2-, CH3-, S3- / Photodetachment of Some Molecular Negative Ions: P2-, As2-, CH2-, CH3-, S3-

1977 ◽  
Vol 32 (6) ◽  
pp. 600-603
Author(s):  
D. Feldmann ◽  
R. Rackwitz ◽  
H. J. Kaiser ◽  
E. Heinicke
Keyword(s):  
Photon Energy ◽  
Cross Sections ◽  
Negative Ions ◽  
The Cross

Abstract The cross sections have been measured between 0.5 eV and 3 eV photon energy.

The cross sections for different channels in heavy ion nuclear reactions

1971 ◽  
Vol 32 (1) ◽  
pp. 7-9 ◽  
Author(s):  
J. Galin ◽  
D. Guerreau ◽  
M. Lefort ◽  
X. Tarrago
Keyword(s):  
Cross Sections ◽  
Nuclear Reactions ◽  
Heavy Ion ◽  
The Cross

Experimental Studies Of Multilayer Glass Structures On Compression, Compression With Bending And Simple Bending

2019 ◽  
pp. 22-30
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Applied Load ◽  
Experimental Studies ◽  
Strength Properties ◽  
Research Topic ◽  
Normative Values ◽  
Laminated Glass ◽  
The Cross ◽  
Experimental Values

The work of multilayer glass structures for central and eccentric compression and bending are considered. The substantiation of the chosen research topic is made. The description and features of laminated glass for the structures investigated, their characteristics are presented. The analysis of the results obtained when testing for compression, compression with bending, simple bending of models of columns, beams, samples of laminated glass was made. Overview of the types and nature of destruction of the models are presented, diagrams of material operation are constructed, average values of the resistance of the cross-sections of samples are obtained, the table of destructive loads is generated. The need for development of a set of rules and guidelines for the design of glass structures, including laminated glass, for bearing elements, as well as standards for testing, rules for assessing the strength, stiffness, crack resistance and methods for determining the strength of control samples is emphasized. It is established that the strength properties of glass depend on the type of applied load and vary widely, and significantly lower than the corresponding normative values of the strength of heat-strengthened glass. The effect of the connecting polymeric material and manufacturing technology of laminated glass on the strength of the structure is also shown. The experimental values of the elastic modulus are different in different directions of the cross section and in the direction perpendicular to the glass layers are two times less than along the glass layers.

Studies of cross-sections of short-halflife isomer states excitation in photonuclear reactions

1998 ◽  
Vol 3 (0) ◽  
pp. 8-10
Author(s):  
Й. З. Беседа ◽  
В. С. Бохінюк ◽  
А. І. Гутій ◽  
А. П. Осипенко ◽  
Н. В. Пащенко ◽  
...  
Keyword(s):  
Cross Sections ◽  
Photonuclear Reactions

scholarly journals Total cross sections of eγ → $$ eX\overline{X} $$ processes with X = μ, γ, e via multiloop methods

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Roman N. Lee ◽  
Alexey A. Lyubyakin ◽  
Vyacheslav A. Stotsky
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Elliptic Integral ◽  
High Energy ◽  
Calculation Methods ◽  
Complete Elliptic Integral ◽  
Total Cross Sections ◽  
Multiloop Calculation ◽  
The Cross ◽  
Analytical Expressions

Abstract Using modern multiloop calculation methods, we derive the analytical expressions for the total cross sections of the processes e−γ →$$ {e}^{-}X\overline{X} $$ e − X X ¯ with X = μ, γ or e at arbitrary energies. For the first two processes our results are expressed via classical polylogarithms. The cross section of e−γ → e−e−e+ is represented as a one-fold integral of complete elliptic integral K and logarithms. Using our results, we calculate the threshold and high-energy asymptotics and compare them with available results.

Sign in / Sign up

Export Citation Format

Share Document