Fast Neutron Capture in Tl, Hg, Au, and Ta and Gamma Ray Strength Functions

1974 ◽  
Vol 52 (11) ◽  
pp. 989-998 ◽  
Author(s):  
E. D. Earle ◽  
M. A. Lone ◽  
G. A. Bartholomew ◽  
W. J. McDonald ◽  
K. H. Bray ◽  
...  
Keyword(s):  
Neutron Capture ◽  
Gamma Ray ◽  
Strength Function ◽  
Detector Response ◽  
Strong Decrease ◽  
Fitting Method ◽  
Spectral Distributions ◽  
Γ Ray ◽  
Strength Functions ◽  
Spectrum Fitting

Gamma ray spectra following the capture of 0.7, 1.7, and 2.6 MeV neutrons in Tl and Hg, of 0.7 and 2.6 MeV neutrons in Ta, and of 2.6 MeV neutrons in Au were measured with a NaI detector. The spectral distributions were obtained by unfolding the detector response function, and γ-ray strength functions were deduced for Tl, Au, and Ta by a spectrum fitting method. The strength functions in Tl and Au, when compared with the Lorentzian predictions, show a strong decrease below ~5 MeV and in Tl there is a resonance-like structure at ~5.5 MeV. No such structure is found in the strength function for Ta. This behavior is qualitatively interpreted in terms of recent particle–hole calculations.

scholarly journals Nuclear level densities and γ-ray strength functions of 180,181Ta and neutron capture cross sections

2017 ◽  
Vol 146 ◽  
pp. 01010 ◽  
Author(s):  
K.L. Malatji ◽  
B.V. Kheswa ◽  
M. Wiedeking ◽  
F.L. Bello Garrote ◽  
C.P. Brits ◽  
...  
Keyword(s):  
Cross Sections ◽  
Neutron Capture ◽  
Capture Cross ◽  
Nuclear Level ◽  
Level Densities ◽  
Γ Ray ◽  
Strength Functions ◽  
Capture Cross Sections

Thermal neutron capture γ-ray spectrum of molybdenum and ruthenium

1991 ◽  
Vol 69 (6) ◽  
pp. 658-664 ◽  
Author(s):  
M. A. Islam ◽  
T. J. Kennett ◽  
W. V. Prestwich
Keyword(s):  
Thermal Neutron ◽  
Neutron Capture ◽  
Nuclear Reactor ◽  
Thermal Neutron Capture ◽  
Global Average ◽  
Transition Level ◽  
Γ Rays ◽  
Γ Ray ◽  
Strength Functions ◽  
Mcmaster University

The thermal neutron capture γ rays from natural molybdenum and ruthenium have been studied using a pair spectrometer and the tangential facility at the McMaster University Nuclear Reactor. Precise transition, level, and neutron separation energies of different isotopes are inferred. The separation energies are: Sn(93Mo) = 8069.76 ± 0.09, Sn(95Mo) = 7369.10 ± 0.10, Sn(96Mo) = 9154.31 ± 0.05, Sn(97Mo) = 6821.15 ± 0.25, Sn(98Mo) = 8642.55 ± 0.07, Sn(99Mo) = 5925.42 ± 0.15, Sn(100Ru) = 9673.48 ± 0.05, and Sn(102Ru) = 9219.64 ± 0.05 keV. The M1 strength functions of 100Ru,102Ru, 96Mo, and 98Mo are (34 ± 15) × 10−9, (82 ± 41) × 10−9, (22 ± 7) × 10−9, and (25 ± 8) × 10−9 MeV−3, respectively. All values but that for 102Ru agree with the global average of (20 ± 6) × 10−9 MeV−3. The average [Formula: see text] of 96Mo observed is 247 ± 175 e2 fm4 MeV−1.

Renormalization of the γ-ray strength functions of light nuclei

2015 ◽  
Vol 24 (03) ◽  
pp. 1550018
Author(s):  
Bora Canbula ◽  
Sibel Erşan ◽  
Halil Babacan
Keyword(s):  
Radiative Capture ◽  
Level Density ◽  
Strength Function ◽  
Light Nuclei ◽  
Collective Effects ◽  
Density Parameter ◽  
Nuclear Level Density ◽  
Γ Ray ◽  
Strength Functions ◽  
Normalization Factors

γ-ray strength function is the key input for the photonuclear reactions, which have a special astrophysical importance, and should be renormalized by using the nuclear level density for calculating the theoretical average radiative capture width, but performing such renormalization is challenging for light nuclei. With this motivation, recently introduced level density parameter formula including collective effects is used to calculate the average radiative capture width of light nuclei, and therefore to renormalize their γ-ray strength functions. Obtained normalization factors are tested in (n, γ) reactions for the necessity of renormalization for light nuclei.

Theoretical photoneutron cross-section calculations on Osmium isotopes by Talys and Empire codes

2019 ◽  
Vol 34 (26) ◽  
pp. 1950210 ◽  
Author(s):  
İsmail Hakki Sarpün ◽  
Hasan Özdoğan ◽  
Kemal Taşdöven ◽  
Hüseyin Ali Yalim ◽  
Abdullah Kaplan
Keyword(s):  
Cross Section ◽  
Gamma Ray ◽  
Level Density ◽  
Strength Function ◽  
Reaction Cross ◽  
Density Parameter ◽  
Photoneutron Reaction ◽  
Level Density Models ◽  
Osmium Isotopes ◽  
Strength Functions

In this study, the level density parameter and the gamma ray strength function effects on photoneutron reaction cross-section calculations for Osmium isotopes were investigated by employing available level density models and gamma ray strength functions within Talys v1.8 and Empire v3.1 nuclear codes. A relative variance analysis was done to determine the best gamma ray strength function. Then, the effect of level density models for the photoneutron reactions was investigated by using the best gamma ray strength function. The results were compared with each other and also with the experimental data taken from the literature.

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