scholarly journals On the Foundation of the Unified Nuclear Model, II

1955 ◽  
Vol 13 (5) ◽  
pp. 557-559 ◽  
Author(s):  
Tosio Marumori ◽  
Eiji Yamada
Keyword(s):  
Nuclear Model

scholarly journals Statistical Analysis of Tritium Breeding Ratio Deviations in the DEMO Due to Nuclear Data Uncertainties

2021 ◽  
Vol 11 (11) ◽  
pp. 5234
Author(s):  
Jin Hun Park ◽  
Pavel Pereslavtsev ◽  
Alexandre Konobeev ◽  
Christian Wegmann
Keyword(s):  
Monte Carlo ◽  
Fusion Reactor ◽  
Nuclear Data ◽  
Data File ◽  
Nuclear Model ◽  
Model Parameters ◽  
Tritium Breeding ◽  
Tritium Breeding Ratio ◽  
Nuclear Data Library ◽  
Breeding Ratio

For the stable and self-sufficient functioning of the DEMO fusion reactor, one of the most important parameters that must be demonstrated is the Tritium Breeding Ratio (TBR). The reliable assessment of the TBR with safety margins is a matter of fusion reactor viability. The uncertainty of the TBR in the neutronic simulations includes many different aspects such as the uncertainty due to the simplification of the geometry models used, the uncertainty of the reactor layout and the uncertainty introduced due to neutronic calculations. The last one can be reduced by applying high fidelity Monte Carlo simulations for TBR estimations. Nevertheless, these calculations have inherent statistical errors controlled by the number of neutron histories, straightforward for a quantity such as that of TBR underlying errors due to nuclear data uncertainties. In fact, every evaluated nuclear data file involved in the MCNP calculations can be replaced with the set of the random data files representing the particular deviation of the nuclear model parameters, each of them being correct and valid for applications. To account for the uncertainty of the nuclear model parameters introduced in the evaluated data file, a total Monte Carlo (TMC) method can be used to analyze the uncertainty of TBR owing to the nuclear data used for calculations. To this end, two 3D fully heterogeneous geometry models of the helium cooled pebble bed (HCPB) and water cooled lithium lead (WCLL) European DEMOs were utilized for the calculations of the TBR. The TMC calculations were performed, making use of the TENDL-2017 nuclear data library random files with high enough statistics providing a well-resolved Gaussian distribution of the TBR value. The assessment was done for the estimation of the TBR uncertainty due to the nuclear data for entire material compositions and for separate materials: structural, breeder and neutron multipliers. The overall TBR uncertainty for the nuclear data was estimated to be 3~4% for the HCPB and WCLL DEMOs, respectively.

Cross sections for d-3H neutron interactions with samarium isotopes

2016 ◽  
Vol 104 (8) ◽  
Author(s):  
Junhua Luo ◽  
Chunlei Wu ◽  
Li Jiang ◽  
Long He
Keyword(s):  
Experimental Data ◽  
Neutron Flux ◽  
Cross Sections ◽  
Theoretical Calculations ◽  
Nuclear Model ◽  
Activation Technique ◽  
Incident Neutron ◽  
Reaction Threshold ◽  
Talys 1.6 ◽  
The Cross

Abstract:The cross sections for (n,x) reactions on samarium isotopes were measured at (d-T) neutron energies of 13.5 and 14.8 MeV with the activation technique. Samples were activated along with Nb and Al monitor foils to determine the incident neutron flux. Theoretical calculations of excitation functions were performed using the nuclear model codes TALYS-1.6 and EMPIRE-3.2 Malta with default parameters, at neutron energies varying from the reaction threshold to 20 MeV. The results were discussed and compared with experimental data found in the literature. At neutron energies 13.5 and 14.8 MeV, the cross sections of the

scholarly journals Th229m isomer from a nuclear model perspective

2021 ◽  
Vol 103 (1) ◽  
Author(s):  
Nikolay Minkov ◽  
Adriana Pálffy
Keyword(s):  
Nuclear Model

scholarly journals NUCLEAR MODEL OF BINDING ALPHA-PARTICLES

2005 ◽  
Author(s):  
K.A. GRIDNEV ◽  
S.YU. TORILOV ◽  
V.G. KARTAVENKO ◽  
W. GREINER ◽  
D.K. GRIDNEV ◽  
...  
Keyword(s):  
Alpha Particles ◽  
Nuclear Model

Classical Self-Consistent Nuclear Model

1961 ◽  
Vol 124 (1) ◽  
pp. 227-232 ◽  
Author(s):  
R. G. Seyler ◽  
C. H. Blanchard
Keyword(s):  
Nuclear Model ◽  
Self Consistent

Studying the coherence of studentsʼ portrayed representations of the atomic structure - Connections with conceptions and misconceptions

2021 ◽  
Vol 32 (2) ◽  
pp. 164-171
Author(s):  
Nikolaos Zarkadis ◽  
◽  
Dimitrios Stamovlasis ◽  
George Papageorgiou ◽  
◽  
...  
Keyword(s):  
Latent Class Analysis ◽  
Atomic Structure ◽  
Latent Class ◽  
Theory And Practice ◽  
Particle Model ◽  
Nuclear Model ◽  
Education Students ◽  
Psychometric Method ◽  
Drawing Tasks ◽  
And Behavior

The present study investigated the association of students’ fundamental ideas and misconceptions about ontological features of atom identity and behavior with the formation of their portrayed representations of the atomic structure. Participants (n = 421) were secondary education students in the eighth, tenth, and twelfth grades. Students’ portrayed representations of the atomic structure were accessed through drawing tasks, while their understanding of the ontological features of atom was measured through a specially designed questionnaire. Latent Class Analysis (LCA), a psychometric method, was applied to the elementary features of the portrayed representations to classify them and test the potential coherence of their representations regarding atomic structure. The LCA revealed three latent classes, which showed a relative coherence in three of the anticipated models, “Particle model,” “Nuclear model,” and “Bohrʼs model.” Moreover, students’ conceptions and misconception about the ontological features of atom were used as covariates in the LCA and their effects on the above-mentioned class-memberships were estimated. Results indicated a significant effect of students’ conceptions of the atomic ontological features on their portrayed representations of the atomic structure. Implications for theory and practice are discussed.

SHAPE EVOLUTION OF 96ZR AND 96MО WITH EXCITATION ENERGY INCREASE

2019 ◽  
pp. 37-41
Author(s):  
M.A. Mardyban ◽  
D.A. Sazonov ◽  
E.A. Kolganova ◽  
R.V. Jolos
Keyword(s):  
Potential Energy ◽  
Excitation Energy ◽  
Transition Probabilities ◽  
Collective Excitations ◽  
Nuclear Model ◽  
Shape Evolution ◽  
Energy Increase ◽  
Excitation Energies ◽  
Satisfactory Description

The observed properties of the low-lying collective excitations of 96Zr and 96Mo are investigated in the framework of the collective quadrupole nuclear model with the Bohr Hamiltonian, whose potential energy has two minima – spherical and deformed. Satisfactory description of the excitation energies and E2 transition probabilities is obtained. It is shown that in the case of 96Zr both minima are sufficiently deep. However, in the case of 96Mo a deformed minimum is only outlined.

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