Nucleon Emission Number as a Probe of Isospin-Dependent N—N Cross Section in Photonuclear Reactions

2014 ◽  
Vol 31 (10) ◽  
pp. 102501
Author(s):  
Wen-Jun Guo ◽  
Jiang-Wei Huang ◽  
Gao-Chan Yong ◽  
Xiao-Ji Zhang ◽  
Ao Zhang
Keyword(s):  
Cross Section ◽  
Photonuclear Reactions ◽  
Nucleon Emission

CORRELATED NUCLEON EMISSION IN PERIPHERAL RELATIVISTIC HEAVY ION COLLISIONS

1993 ◽  
Vol 08 (13) ◽  
pp. 2287-2296
Author(s):  
L. L. BARZ ◽  
A. F. R. de TOLEDO PIZA
Keyword(s):  
Cross Section ◽  
Born Approximation ◽  
Heavy Ion Collisions ◽  
Short Range ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Final States ◽  
Ion Collisions ◽  
Nucleon Emission ◽  
Short Range Correlations

The effects of short range correlations for two nucleon emission in peripheral relativistic heavy ion collisions are investigated. The cross section is calculated in Born approximation with properly orthogonalized initial and final states.

scholarly journals Photonuclear reaction study with the (p, γ) resonance γ-source

2020 ◽  
Vol 239 ◽  
pp. 01014
Author(s):  
Chuangye He ◽  
Yongle Dang ◽  
Fulong Liu ◽  
Guangyong Fu ◽  
Di Wu ◽  
...  
Keyword(s):  
Experimental Method ◽  
Cross Section ◽  
Photonuclear Reaction ◽  
Photonuclear Reactions ◽  
Tandem Accelerator ◽  
Reaction Study

The (p, γ) resonance is a good way to produce monoenergetic γ rays. It becomes an important tool for studying photonuclear reactions. In this work, 13C(p, γ)14N resonance is studied to produce 9.17 MeV γ ray using the 2 × 1.7 MV tandem accelerator at CIAE. The flux of 9.17 MeV γ was determined to be 2.3 × 105/s. 197Au photoneutron cross section was measured to be 45.4 ± 6.9 mb under the irradiation of 13C(p, γ)14N resonance γ -source. The value is close to the previous results. It certificates that we have developed an experimental method for photonuclear reaction study.

PHOTO-ALPHA REACTIONS IN NUCLEAR EMULSIONS

1953 ◽  
Vol 31 (5) ◽  
pp. 723-757 ◽  
Author(s):  
C. H. Millar ◽  
A. G. W. Cameron
Keyword(s):  
Cross Section ◽  
Photonuclear Reactions ◽  
Heavy Particles ◽  
Nuclear Emulsions ◽  
X Ray ◽  
Section Versus ◽  
Energy Relationships ◽  
The University ◽  
Α Particles

In experiments to search for new photonuclear reactions involving the emission of heavy particles [Formula: see text], Ilford E1 emulsions were exposed to 240 roentgens of X radiation from the University of Saskatchewan betatron operating at energies up to 27 Mev. The plates were developed by a special "grain-gradation" technique which suppressed proton tracks and X-ray fog. The ejection of single α particles was observed from C13, N14, O16, Ag, and Br. Multiple-pronged stars were observed due to the photodisintegration of C12, N14, O16, and probably Ag or Br. Interpretations of these events were deduced, and cross section versus energy curves for many of them were obtained. Range–energy relationships were obtained for Be9, B10, and C12 particles in E1 emulsions.

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.

XUV Absorption Spectra of Carbon Ions

1988 ◽  
Vol 102 ◽  
pp. 71-73
Author(s):  
E. Jannitti ◽  
P. Nicolosi ◽  
G. Tondello
Keyword(s):  
Absorption Spectra ◽  
Cross Section ◽  
Theoretical Calculations ◽  
Photoionization Cross Section ◽  
Carbon Ions

AbstractThe photoabsorption spectra of the carbon ions have been obtained by using two laser-produced plasmas. The photoionization cross-section of the CV has been absolutely measured and the value at threshold, σ=(4.7±0.5) × 10−19cm2, as well as its behaviour at higher energies agrees quite well with the theoretical calculations.

Elastic Scattering in Electron Microscopy

1973 ◽  
Vol 31 ◽  
pp. 252-253
Author(s):  
J. Langmore ◽  
M. Isaacson ◽  
J. Wall ◽  
A. V. Crewe
Keyword(s):  
Electron Microscopy ◽  
Elastic Scattering ◽  
Cross Section ◽  
Quantum Noise ◽  
Dark Field ◽  
Elastic Cross Section ◽  
Biological Molecules ◽  
Dark Field Microscopy ◽  
Field Systems ◽  
Effects Of Radiation

High resolution dark field microscopy is becoming an important tool for the investigation of unstained and specifically stained biological molecules. Of primary consideration to the microscopist is the interpretation of image Intensities and the effects of radiation damage to the specimen. Ignoring inelastic scattering, the image intensity is directly related to the collected elastic scattering cross section, σɳ, which is the product of the total elastic cross section, σ and the eficiency of the microscope system at imaging these electrons, η. The number of potentially bond damaging events resulting from the beam exposure required to reduce the effect of quantum noise in the image to a given level is proportional to 1/η. We wish to compare η in three dark field systems.

Sign in / Sign up

Export Citation Format

Share Document