The Experts below are selected from a list of 310386 Experts worldwide ranked by ideXlab platform
P O Hess - One of the best experts on this subject based on the ideXlab platform.
-
16o within the semimicroscopic algebraic Cluster Model and the importance of the pauli exclusion principle
European Physical Journal A, 2019Co-Authors: P O Hess, J R M Berrielaguayo, L J ChaveznunezAbstract:The Semimicroscopic Algebraic Cluster Model (SACM) is applied to 16O, assumed to consist of a system of four $\alpha$-Clusters. For the 4-$\alpha$ Cluster system we take the Model space already obtained in the past, which observes the Pauli Exclusion Principle (PEP) and is symmetric under permutation of the $4\alpha$-particles. A phenomenological Hamiltonian is used. The spectrum and transition values are determined. One of the main objectives is to test the importance of the Pauli Exclusion Principle (PEP), comparing the results with the Algebraic Cluster Model (ACM), which does not include the PEP, and claims that for the ground state the 16O shows evidence of a tetrahedral structure which can be explained easily by symmetry arguments. We show that the PEP is very important and cannot be neglected, otherwise it leads to a wrong interpretation of the band structure and to too many states at low energy, especially to an accumulation of parity doublets.
-
16o within the semimicroscopic algebraic Cluster Model and the importance of the pauli exclusion principle
arXiv: Nuclear Theory, 2019Co-Authors: P O Hess, J R M Berrielaguayo, L J ChaveznunezAbstract:The Semimicroscopic Algebraic Cluster Model (SACM) is applied to 16O, assumed to consist of a system of four alpha-Clusters. For the 4-alpha Cluster system a microscopic Model space is constructed, which observes the Pauli-Exclusion-Principle (PEP) and is symmetric under permutation of the 4-alpha-particles. A phenomenological Hamiltonian is used, justifying the name Semi in the SACM. The spectrum and transition values are determined. One of the main objectives is to test the importance of the Pauli Exclusion Principle (PEP), comparing the results with the Algebraic Cluster Model (ACM), which does not include the PEP, and claims that the 16O shows evidence of a tetrahedral structure, which can be explained easily by symmetry arguments. We show that PEP is very important and cannot be neglected, otherwise it leads to a wrong interpretation of the band structure and to too many states at low energy.
-
The geometric interpretation of the semimicroscopic algebraic Cluster Model and the role of the Pauli principle
2012Co-Authors: H. Yépez-martínez, P O Hess, P. R. Fraser, Géza LévaiAbstract:The geometrical mapping of the Semimicroscopic Algebraic Cluster Model (SACM) is performed via coherent states. The SACM strictly observes the Pauli exclusion principle. It is shown that the resulting mapping can be reproduced by the mapping of other algebraic nuclear Cluster Model, the Phenomenological Algebraic Cluster Model (PACM), which does not observe the Pauli exclusion principle, but with a more complicated Hamiltonian. The phase transitions are investigated and compared within two algebraic Cluster Models. First-and second-order phase transition are observed. For the SACM also a critical line appears. The general discussion of phase transitions is reduced to at most three effective parameters, which are functions of all possible interaction parameters in the Model.
-
Cranking the semimicroscopic algebraic Cluster Model
Revista Mexicana De Fisica, 2008Co-Authors: H. Yépez-martínez, P O HessAbstract:Resumen en: Initial steps are presented on the cranking of the Semimicroscopic Algebraic Cluster Model (SACM). This permits to treat Hamiltonians which do not presen...
L J Chaveznunez - One of the best experts on this subject based on the ideXlab platform.
-
16o within the semimicroscopic algebraic Cluster Model and the importance of the pauli exclusion principle
European Physical Journal A, 2019Co-Authors: P O Hess, J R M Berrielaguayo, L J ChaveznunezAbstract:The Semimicroscopic Algebraic Cluster Model (SACM) is applied to 16O, assumed to consist of a system of four $\alpha$-Clusters. For the 4-$\alpha$ Cluster system we take the Model space already obtained in the past, which observes the Pauli Exclusion Principle (PEP) and is symmetric under permutation of the $4\alpha$-particles. A phenomenological Hamiltonian is used. The spectrum and transition values are determined. One of the main objectives is to test the importance of the Pauli Exclusion Principle (PEP), comparing the results with the Algebraic Cluster Model (ACM), which does not include the PEP, and claims that for the ground state the 16O shows evidence of a tetrahedral structure which can be explained easily by symmetry arguments. We show that the PEP is very important and cannot be neglected, otherwise it leads to a wrong interpretation of the band structure and to too many states at low energy, especially to an accumulation of parity doublets.
-
16o within the semimicroscopic algebraic Cluster Model and the importance of the pauli exclusion principle
arXiv: Nuclear Theory, 2019Co-Authors: P O Hess, J R M Berrielaguayo, L J ChaveznunezAbstract:The Semimicroscopic Algebraic Cluster Model (SACM) is applied to 16O, assumed to consist of a system of four alpha-Clusters. For the 4-alpha Cluster system a microscopic Model space is constructed, which observes the Pauli-Exclusion-Principle (PEP) and is symmetric under permutation of the 4-alpha-particles. A phenomenological Hamiltonian is used, justifying the name Semi in the SACM. The spectrum and transition values are determined. One of the main objectives is to test the importance of the Pauli Exclusion Principle (PEP), comparing the results with the Algebraic Cluster Model (ACM), which does not include the PEP, and claims that the 16O shows evidence of a tetrahedral structure, which can be explained easily by symmetry arguments. We show that PEP is very important and cannot be neglected, otherwise it leads to a wrong interpretation of the band structure and to too many states at low energy.
J R M Berrielaguayo - One of the best experts on this subject based on the ideXlab platform.
-
16o within the semimicroscopic algebraic Cluster Model and the importance of the pauli exclusion principle
European Physical Journal A, 2019Co-Authors: P O Hess, J R M Berrielaguayo, L J ChaveznunezAbstract:The Semimicroscopic Algebraic Cluster Model (SACM) is applied to 16O, assumed to consist of a system of four $\alpha$-Clusters. For the 4-$\alpha$ Cluster system we take the Model space already obtained in the past, which observes the Pauli Exclusion Principle (PEP) and is symmetric under permutation of the $4\alpha$-particles. A phenomenological Hamiltonian is used. The spectrum and transition values are determined. One of the main objectives is to test the importance of the Pauli Exclusion Principle (PEP), comparing the results with the Algebraic Cluster Model (ACM), which does not include the PEP, and claims that for the ground state the 16O shows evidence of a tetrahedral structure which can be explained easily by symmetry arguments. We show that the PEP is very important and cannot be neglected, otherwise it leads to a wrong interpretation of the band structure and to too many states at low energy, especially to an accumulation of parity doublets.
-
16o within the semimicroscopic algebraic Cluster Model and the importance of the pauli exclusion principle
arXiv: Nuclear Theory, 2019Co-Authors: P O Hess, J R M Berrielaguayo, L J ChaveznunezAbstract:The Semimicroscopic Algebraic Cluster Model (SACM) is applied to 16O, assumed to consist of a system of four alpha-Clusters. For the 4-alpha Cluster system a microscopic Model space is constructed, which observes the Pauli-Exclusion-Principle (PEP) and is symmetric under permutation of the 4-alpha-particles. A phenomenological Hamiltonian is used, justifying the name Semi in the SACM. The spectrum and transition values are determined. One of the main objectives is to test the importance of the Pauli Exclusion Principle (PEP), comparing the results with the Algebraic Cluster Model (ACM), which does not include the PEP, and claims that the 16O shows evidence of a tetrahedral structure, which can be explained easily by symmetry arguments. We show that PEP is very important and cannot be neglected, otherwise it leads to a wrong interpretation of the band structure and to too many states at low energy.
Koichi Yazaki - One of the best experts on this subject based on the ideXlab platform.
-
Quark Cluster Model and Confinement
Progress of Theoretical Physics Supplement, 2013Co-Authors: Yuji Koike, Osamu Morimatsu, Koichi YazakiAbstract:How confinement of quarks is implemented for multi-hadron systems in the quark Cluster Model is reviewed. In order to learn the nature of the confining interaction for fermions we first study 1+1 dimensional QED and QCD, in which the gauge field can be eliminated exactly and generates linear interaction of fermions. Then, we compare the two-body potential Model, the flip-flop Model and the Born-Oppenheimer approach in the strong coupling lattice QCD for the meson-meson system. Having shown how the long-range attraction between hadrons, van der Waals interaction, shows up in the two-body potential Model, we discuss two distinct attempts beyond the two-body potential Model: one is a many-body potential Model, the flip-flop Model, and the other is the Born-Oppenheimer approach in the strong coupling lattice QCD. We explain how the emergence of the long-range attraction is avoided in these attempts. Finally, we present the results of the application of the flip-flop Model to the baryon-baryon scattering in the quark Cluster Model.
-
Quark Cluster Model
Nuclear Physics A, 2000Co-Authors: Koichi YazakiAbstract:Abstract The quark-meson hybrid Model, in which the quark Cluster Model for baryon- baryon interactions is supplemented with meson-exchange contributions, is briefly reviewed. Some arguments are given that such a hybrid picture provides us with a simple and efficient way of describing single- and two- baryon systems.
Emilia Sicilia - One of the best experts on this subject based on the ideXlab platform.
-
Interaction of CO with PdAu(111) and PdAu(100) Bimetallic Surfaces : A Theoretical Cluster Model Study
Journal of Physical Chemistry C, 2008Co-Authors: Gloria Mazzone, Ivan Rivalta, Nino Russo, Emilia SiciliaAbstract:Structural parameters, binding energies, and bonding mechanism of CO molecules on PdAu(111) and PdAu(100) surface alloys have been investigated at the density functional level by employing a Cluster Model approach. Cluster Models have been constructed to represent second-neighbor Pd pairs on both the exposed gold surfaces, given that special ensembles are able to confine reactants in a small region of bimetallic catalysts. Analysis of the Cluster size dependence of the chemisorption properties has been carried out together with the study of the influence of exchange correlation functional and basis set quality. An accurate description of the bonding mechanism of CO on top of Pd monomers surrounded by gold atoms has been achieved by an atom-projected description of the surface bond. The remarkable agreement of computed results with available experimental information and previous periodic supercell calculations clearly indicates that the adopted Cluster Models are suitable for chemisorption studies on PdAu surface alloys.