Test of gamma-ray strength functions in nuclear reaction model calculations

1990 ◽  
Vol 41 (5) ◽  
pp. 1941-1955 ◽  
Author(s):  
J. Kopecky ◽  
M. Uhl
Keyword(s):  
Nuclear Reaction ◽  
Gamma Ray ◽  
Reaction Model ◽  
Model Calculations ◽  
Strength Functions

scholarly journals Testing and Improvements of Gamma-Ray Strength Functions for Nuclear Model Calculations

2002 ◽  
Vol 39 (sup2) ◽  
pp. 811-814 ◽  
Author(s):  
Vladimir A. Plujko ◽  
S.N. Ezhov ◽  
M.O. Kavatsyuk ◽  
A.A. Grebenyuk ◽  
R.V. Yermolenko
Keyword(s):  
Gamma Ray ◽  
Nuclear Model ◽  
Model Calculations ◽  
Strength Functions

scholarly journals Urca nuclide production in Type-I X-ray bursts and implications for nuclear physics studies

2020 ◽  
Vol 500 (3) ◽  
pp. 2958-2968
Author(s):  
Grant Merz ◽  
Zach Meisel
Keyword(s):  
Light Curve ◽  
Nuclear Reaction ◽  
Nuclear Physics ◽  
Thermal Structure ◽  
Reaction Rates ◽  
High Mass ◽  
Type I ◽  
Model Calculations ◽  
X Ray ◽  
Lower Temperature

ABSTRACT The thermal structure of accreting neutron stars is affected by the presence of urca nuclei in the neutron star crust. Nuclear isobars harbouring urca nuclides can be produced in the ashes of Type I X-ray bursts, but the details of their production have not yet been explored. Using the code MESA, we investigate urca nuclide production in a one-dimensional model of Type I X-ray bursts using astrophysical conditions thought to resemble the source GS 1826-24. We find that high-mass (A ≥ 55) urca nuclei are primarily produced late in the X-ray burst, during hydrogen-burning freeze-out that corresponds to the tail of the burst light curve. The ∼0.4–0.6 GK temperature relevant for the nucleosynthesis of these urca nuclides is much lower than the ∼1 GK temperature most relevant for X-ray burst light curve impacts by nuclear reaction rates involving high-mass nuclides. The latter temperature is often assumed for nuclear physics studies. Therefore, our findings alter the excitation energy range of interest in compound nuclei for nuclear physics studies of urca nuclide production. We demonstrate that for some cases this will need to be considered in planning for nuclear physics experiments. Additionally, we show that the lower temperature range for urca nuclide production explains why variations of some nuclear reaction rates in model calculations impacts the burst light curve but not local features of the burst ashes.

An investigation of effects of level density models and gamma ray strength functions on cross-section calculations for the production of 90Y, 153Sm, 169Er, 177Lu and 186Re therapeutic radioisotopes via (n,γ) reactions

2019 ◽  
Vol 108 (1) ◽  
pp. 11-17
Author(s):  
Mert Şekerci ◽  
Hasan Özdoğan ◽  
Abdullah Kaplan
Keyword(s):  
Experimental Data ◽  
Cross Section ◽  
Production Cross Section ◽  
Gamma Ray ◽  
Production Cross ◽  
Level Density ◽  
Experimental Studies ◽  
Level Density Models ◽  
Strength Functions ◽  
Cancer Diseases

Abstract One of the methods used to treat different cancer diseases is the employment of therapeutic radioisotopes. Therefore, many clinical, theoretical and experimental studies are being carried out on those radioisotopes. In this study, the effects of level density models and gamma ray strength functions on the theoretical production cross-section calculations for the therapeutic radioisotopes 90Y, 153Sm, 169Er, 177Lu and 186Re in the (n,γ) route have been investigated. TALYS 1.9 code has been used by employing different level density models and gamma ray strength functions. The theoretically obtained data were compared with the experimental data taken from the literature. The results are presented graphically for better interpretation.

scholarly journals Uncertainty evaluation of nuclear reaction model parameters using integral and microscopic measurements. Covariances evaluation with CONRAD code

2010 ◽  
Vol 8 ◽  
pp. 04002 ◽  
Author(s):  
C. De Saint Jean ◽  
B. Habert ◽  
P. Archier ◽  
G. Noguere ◽  
D. Bernard ◽  
...  
Keyword(s):  
Nuclear Reaction ◽  
Reaction Model ◽  
Uncertainty Evaluation ◽  
Model Parameters

Absolute dipole gamma-ray strength functions for 176Lu

1985 ◽  
Author(s):  
D. G. Gardner ◽  
M. A. Gardner ◽  
R. W. Hoff
Keyword(s):  
Gamma Ray ◽  
Strength Functions

scholarly journals Revisiting the hot matter in the center of gamma-ray bursts and supernovae

2013 ◽  
Vol 555 ◽  
pp. A129 ◽  
Author(s):  
Ang Li ◽  
Tong Liu
Keyword(s):  
Strong Interaction ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Model Calculations ◽  
Hartree Fock ◽  
Equation Of States ◽  
Chemical Potentials ◽  
Hot Matter ◽  
Inner Region ◽  
Proto Neutron Star

Aims. Hot matter with nucleons can be produced in the inner region of the neutrino-dominated accretion flow in gamma-ray bursts or during the proto-neutron star birth in successful supernovae. The composition and equation of state of the matter depend on the dynamic β equilibrium under various neutrino opacities. The strong interaction between nucleons may also play an important role. We plan to extend the previous studies by incorporating these two aspects in our model. Methods. The modification of the β-equilibrium condition from neutrino optically thin to thick was modeled by an equilibrium factor χ ranging between the neutrino-freely-escaping case and the neutrino-trapped case. We employed the microscopic Brueckner-Hartree-Fock approach extended to the finite temperature regime to study the interacting nucleons. Results. We show the composition and chemical potentials of the hot nuclear matter for different densities and temperatures at each stage of β equilibrium. We also compare our realistic equation of states with those of the free-gas model. We find that it is important to properly describe the neutrino opacity and the strong interaction between nucleons, and they should be taken into account in model calculations.

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