scholarly journals ESTIMATION OF GROSS-STRUCTURE PARAMETERS OF GIANT DIPOLE RESONANCE: 1. A METHOD

2021 ◽  
pp. 104-108
Author(s):  
V.L. Uvarov ◽  
A.A. Zakharchenko
Keyword(s):  
Cross Sections ◽  
Giant Dipole Resonance ◽  
Theoretical Models ◽  
Structure Parameters ◽  
Isotope Production ◽  
Simple Method ◽  
New Approach ◽  
X Ray ◽  
Dipole Resonance ◽  
Considerable Spread

Available data on photonuclear cross-sections, both measured experimentally and obtained on the basis of theoretical models, are characterized sometimes by a considerable spread. In work, a simple method for the estimation of width (FWHM) and maximum (σmax) of excitation function of a reaction with dominant giant dipole resonance, is given. An analytical model is developed for the description of isotope production in an X-ray beam. It is shown, that the established yield of the reaction in a thin target, overlapping completely the beam with known end-point photon energy makes it possible to estimate the σmax and FWHM values. The possibilities of new approach are demonstrated by a numerical experiment on the reference reactions.

The (g, p) and (g, n) Reactions in Molybdenum

1968 ◽  
Vol 21 (5) ◽  
pp. 765 ◽  
Author(s):  
RW Gellie
Keyword(s):  
Activation Analysis ◽  
Cross Sections ◽  
Giant Dipole Resonance ◽  
Dipole Resonance ◽  
Isospin Splitting ◽  
The Cross ◽  
Medium Weight ◽  
Residual Activation

Measurements have been made of the cross sections for some of the (g,p) and (y, n) reactions in molybdenum using the technique of residual activation analysis. The gross structure of these cross sections is compared with previous measurements and the results are interpreted as evidence for the isospin splitting of the giant dipole resonance in medium weight nuclei.

scholarly journals Energy dependence of exotic nuclei production cross sections by photofission reaction in GDR range

2016 ◽  
Vol 94 (2) ◽  
pp. 243-248 ◽  
Author(s):  
Debasis Bhowmick ◽  
F.A. Khan ◽  
Debasis Atta ◽  
D.N. Basu ◽  
Alok Chakrabarti
Keyword(s):  
Charge Distribution ◽  
Cross Sections ◽  
Giant Dipole Resonance ◽  
Production Cross ◽  
Nuclear Excitation ◽  
Excitation Energies ◽  
Mass Distributions ◽  
Gdr Region ◽  
Dipole Resonance ◽  
Average Photon Energy

Photofission of actinides is studied in the region of nuclear excitation energies that covers the entire giant dipole resonance (GDR) region. The mass distributions of 238U photofission fragments have been explored theoretically for eight different endpoint bremsstrahlung energies from 11.5 to 67.7 MeV, which correspond to average photon energies of 9.09 to 15.90 MeV. Among these energies, 29.1 MeV corresponds to the average photon energy of 13.7 ± 0.3 MeV, which coincides with the GDR peak for 238U photofission. The integrated yield of 238U photofission, as well as charge distribution of photofission products, is calculated and its role in producing nuclei and their neutron-richness is investigated.

(γ, p) cross sections and isospin splitting of the giant dipole resonance in N = 50 nuclei

1975 ◽  
Vol 239 (3) ◽  
pp. 397-411 ◽  
Author(s):  
K. Shoda ◽  
H. Miyase ◽  
M. Sugawara ◽  
T. Saito ◽  
S. Oikawa ◽  
...  
Keyword(s):  
Cross Sections ◽  
Giant Dipole Resonance ◽  
Dipole Resonance ◽  
Isospin Splitting

scholarly journals Direct Photodisintegration of 13C below 17 MeV. Reaction 13C(γ,n) 12C

1969 ◽  
Vol 24 (9) ◽  
pp. 1361-1364 ◽  
Author(s):  
Terje Aurdal
Keyword(s):  
Cross Sections ◽  
Single Particle ◽  
Giant Dipole Resonance ◽  
Valence Neutron ◽  
Nuclear Model ◽  
Final States ◽  
Dipole Resonance

A nuclear model where the single-particle states of the valence neutron are vector coupled to the ground (0+) and first excited (2+) 12C-core states, is considered. The model is applied to calculate total photodisintegration cross sections of the reaction 13C(γ, n)12C for energies below the Giant dipole resonance. The radial wavefunctions in initial- as well as final states are of the Saxon-Woods type.

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.

Integral cross sections of photonuclear reactions near the giant dipole resonance

Atomic Energy ◽  
2000 ◽  
Vol 88 (5) ◽  
pp. 408-413 ◽  
Author(s):  
A. G. Belov ◽  
Yu. P. Gangrskii ◽  
K. K. Gudima ◽  
P. Zuzaan
Keyword(s):  
Cross Sections ◽  
Giant Dipole Resonance ◽  
Photonuclear Reactions ◽  
Dipole Resonance

LORENTZIAN-LIKE MODELS OF E1 RADIATIVE STRENGTH FUNCTIONS

2009 ◽  
Vol 18 (04) ◽  
pp. 996-1001 ◽  
Author(s):  
V. A. PLUJKO ◽  
O. M. GORBACHENKO ◽  
E. V. KULICH
Keyword(s):  
Experimental Data ◽  
Cross Sections ◽  
Giant Dipole Resonance ◽  
Theoretical Calculations ◽  
Strength Function ◽  
Resonance Parameters ◽  
Dipole Resonance ◽  
Radiative Strength Function ◽  
Asymmetric Shape ◽  
Strength Functions

Photoabsorption cross sections and dipole γ-decay strength functions are calculated and compared with experimental data to test Lorentzian-like models of their description in the middle-weight and heavy atomic nuclei. Approaches with asymmetric shape of the radiative strength function are recommended for overall estimation of the dipole γ-strengths. The ready-to-use table of giant dipole resonance parameters and their errors are obtained from fitting the theoretical calculations for photoabsorption cross sections to the experimental data. Systematics for giant dipole resonance parameters are given.

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