Giant dipole resonance in 4He

1980 ◽  
Vol 58 (11) ◽  
pp. 1555-1559 ◽  
Author(s):  
J. J. Bevelacqua
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Giant Dipole Resonance ◽  
Reasonable Agreement ◽  
Center Of Mass ◽  
Nucleon Nucleon ◽  
Nucleon Interaction ◽  
R Matrix ◽  
Dipole Resonance ◽  
Nucleon Nucleon Interaction

The 4He giant dipole resonance is calculated with the generalized R-matrix method of Lane and Robson. The model treats the center of mass correctly and includes noncentral components in the nucleon–nucleon interaction via the Sussex interaction. The 4He(γ,p)3H and 4He(γ,n)3He cross sections are sensitive to the 4He level spectrum, but are in reasonable agreement with the photonuclear data for level schemes which agree with the spectrum suggested by Fiarman and Meyerhof (FM). Other spectra which bracket the FM levels lead to poorer photonuclear cross sections. R-matrix model results also lead to a (γ,p)/(γ,n) cross section ratio which is about unity.

scholarly journals Constraining the in-medium nucleon-nucleon cross section from the width of nuclear giant dipole resonance

2020 ◽  
Vol 807 ◽  
pp. 135532 ◽  
Author(s):  
Rui Wang ◽  
Zhen Zhang ◽  
Lie-Wen Chen ◽  
Che Ming Ko ◽  
Yu-Gang Ma
Keyword(s):  
Cross Section ◽  
Giant Dipole Resonance ◽  
Nucleon Nucleon ◽  
Dipole Resonance

Nuclear mean free paths and transparency at intermediate energies

1983 ◽  
Vol 61 (4) ◽  
pp. 750-753 ◽  
Author(s):  
Paul J. Karol
Keyword(s):  
Cross Sections ◽  
Nucleon Nucleon ◽  
Reaction Cross ◽  
Uniform Density ◽  
Nucleon Interaction ◽  
Density Distributions ◽  
Intermediate Energies ◽  
Soft Spheres ◽  
Nucleon Nucleon Interaction ◽  
Reaction Cross Sections

The soft-spheres model of nuclear reaction cross sections incorporating tapered density distributions is used to evaluate nucleon mean free paths and transparencies at intermediate energies. Comparison with similar calculations employing uniform density distributions shows the latter to give misleading results that nevertheless have been used in recent years as evidence that the physics of the nucleon–nucleon interaction within nuclei is incompletely understood.

A-DEPENDENCE OF Z-SCALING

2001 ◽  
Vol 16 (07) ◽  
pp. 1281-1301 ◽  
Author(s):  
M. V. TOKAREV ◽  
Yu. A. PANEBRATSEV ◽  
I. ZBOROVSKÝ ◽  
G. P. ŠKORO
Keyword(s):  
Cross Sections ◽  
Particle Production ◽  
Center Of Mass ◽  
Nucleon Nucleon ◽  
Hadron Production ◽  
Scale Transformation ◽  
Invariant Cross Section ◽  
Center Of Mass Energy ◽  
Energy Formula ◽  
Nucleon Nucleon Interaction

The A-dependence of z-scaling in inclusive hadron production in pA collisions at high transverse momenta is studied. The concept of z-scaling based on the fundamental principles of Nature such as self-similarity, locality, scale relativity and fractality reflecting the general features of particle interactions is applied for the description of processes of hadron production in pA collisions. The scaling function ψ is expressed via the invariant cross-section Ed3σ/dq3 and the average multiplicity density dN/dη of particles produced at pseudorapidity η=0 in the corresponding nucleon–nucleon interaction. The independence of the function ψ(z) on the center-of-mass energy [Formula: see text] for particle production near 90° in the NN c.m. system for different nuclei from D up to Pb is shown. The scale transformation z→az, ψ→a-1ψ is used to determine the A-dependence of the transformation parameter a. Based on the properties of z-scaling the dependence of the cross-sections for the π±, K±, and [Formula: see text] hadrons produced in pA collisions on transverse momentum q⊥ in the central region (η=0) at RHIC energies is predicted.

scholarly journals Systematic study of proton-induced spallation reactions with microscopic and phenomenological models

2019 ◽  
Vol 25 ◽  
pp. 167
Author(s):  
A. Assimakopoulou ◽  
G. A. Souliotis ◽  
N. Nicolis ◽  
M. Veselsky ◽  
A. Bonasera
Keyword(s):  
Experimental Data ◽  
Phenomenological Models ◽  
Cross Section ◽  
Cross Sections ◽  
Fission Cross Section ◽  
Nucleon Nucleon ◽  
Spallation Reactions ◽  
Intranuclear Cascade ◽  
Nucleon Nucleon Interaction ◽  
Dynamical Description

Proton induced spallation reactions on 238U, 208Pb, 181Ta and 197Au targets at high energies were investigated using the microscopic Contrained Molecular Dynamics (CoMD) model and the phenomenological models INC and SMM. We have calculated the total fission cross sections, the ratio fission cross section to residue cross section, the mass yield curves and the excitation energy after the intranuclear cascade using the CoMD model and the INC/SMM phenomenological models. We made a comparison between the models and the experimental data from the liter- ature. Our calculations showed satisfactory agreement with available experimental data and suggest further improvements in the models. Our study with the CoMD code represents the first complete dynamical description of the spallation process with a microscopic code based on an effective nucleon-nucleon interaction.

Comparative study of alpha + nucleus elastic scattering using different models

2015 ◽  
Vol 24 (01) ◽  
pp. 1550003 ◽  
Author(s):  
A. H. Al-Ghamdi ◽  
Awad A. Ibraheem ◽  
M. El-Azab Farid
Keyword(s):  
Elastic Scattering ◽  
Cross Section ◽  
Optical Potential ◽  
Optical Model ◽  
Distribution Density ◽  
Cluster Structure ◽  
Nucleon Nucleon ◽  
Angular Distributions ◽  
Nucleon Interaction ◽  
Nucleon Nucleon Interaction

The alpha (α) elastic scattering from different targets potential over the energy range 10–240 MeV has been analyzed in the framework of the single-folding (SF) optical model. Four targets are considered, namely, 24 Mg , 28 Si , 32 S and 40 Ca . The SF calculations for the real central part of the nuclear optical potential are performed by folding an effective α–α interaction with the α-cluster distribution density in the target nucleus. The imaginary part of the optical potential is expressed in the phenomenological Woods–Saxon (WS) form. The calculated angular distributions of the elastic scattering differential cross-section using the derived semimicroscopic potentials successfully reproduce 36 sets of data all over the measured angular ranges. The obtained results confirm the validity of the α-cluster structure of the considered nuclei. For the sake of comparison, the same sets of data are reanalyzed using microscopic double-folded optical potentials based upon the density-dependent Jeukenne–Lejeune–Mahaux (JLM) effective nucleon–nucleon interaction.

scholarly journals Study of fusion cross-sections of 16O + 208Pb and 28Si + 208Pb reactions by effective soft-core nucleon-nucleon interaction

2007 ◽  
Vol 22 (1) ◽  
pp. 11-17
Author(s):  
Omid Ghodsi ◽  
Mohamad Mahmodi ◽  
Jamil Ariai
Keyword(s):  
Cross Sections ◽  
Careful Analysis ◽  
Nucleon Nucleon ◽  
Soft Core ◽  
Fusion Reactions ◽  
Nucleon Interaction ◽  
Nucleon Potential ◽  
The Monte Carlo Method ◽  
Nucleon Nucleon Interaction ◽  
The Many

In this paper, the cross-sections of fusion reactions 16O + 208Pb, 28Si + 208Pb, 40C + + 40Ca, 40Ca + 48Ca, 58Ni + 58Ni, and 16O + 154Sm at bombarding energies above and near the fusion barrier have been investigated. The fusion cross-sections have been studied by means of the Monte Carlo method and effective soft-core nucleon-nucleon interaction. One adjustable parameter was used in these calculations. This parameter can change the strength and repulsive parts of soft-core potential values. It has to be adjusted, so that the analytical results are in acceptable agreement with the experimental data. In our calculations, we have taken the range of the nucleon-nucleon soft-core interaction to be constant and equal to that of the M3Y-Raid potential. Results show that the higher values for the diffusion parameter in the Woods-Saxon potential obtained from a careful analysis of 16O + 208Pb and 28Si + 208Pb reactions are due to the many particle effects on the nucleon-nucleon potential.

scholarly journals Nucleon-Nucleon Interaction at High Energies

1950 ◽  
Vol 5 (2) ◽  
pp. 318-318
Author(s):  
F. Fujimoto ◽  
S. Hayakawa ◽  
Y. Yamaguchi
Keyword(s):  
Nucleon Nucleon ◽  
Nucleon Interaction ◽  
High Energies ◽  
Nucleon Nucleon Interaction
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