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Your search keyword '"Vasilevsky, V.S."' showing total 24 results
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24 results on '"Vasilevsky, V.S."'

12. Monopole and quadrupole polarization effects on the α-particle description of <tex>^{8}Be</tex>

Author

Sytcheva, A., Arickx, Frans, Broeckhove, Jan, and Vasilevsky, V.S.

Subjects
Physics
Abstract

We investigate the effect of monopole and quadrupole modes on the elastic alpha-alpha resonance structure of Be-8. To this end, we make a fully microscopic coupled-channels calculation with three coupled channels, using the algebraic model. The continuum spectrum and wave functions are analyzed in terms of the individual channels to understand the nature of the resonances. It is shown that both monopole and quadrupole modes have a nonnegligible effect on the resonances in the alpha-alpha continuum.

Published
2005

16. The S-factor of the 3H(3H, 2n)4He and 3He(3He, 2n)4He reactions using a three-cluster exit channel

Author

Vasilevsky, V.S., Nesterov, A.V., Arickx, Frans, and Broeckhove, Jan

Subjects
Physics
Abstract

The reactions H-3(H-3,2n)He-4 and He-3(He-3,2p)He-4 are investigated within a fully microscopic cluster model featuring a three-cluster exit channel. A hyperspherical harmonics basis is used to describe the three-cluster continuum. The resulting astrophysical S factor of both reactions is in good agreement with experimental data. Analysis of the low-energy scattering parameters reveals no evidence for a hidden resonance state that would increase the cross section of the reactions, and would help to resolve the solar neutrino problem.

Published
2001

17. The algebraic model for scattering in three-s-cluster systems: resonances in the three-cluster continuum of 6He and 6Be

Author

Vasilevsky, V.S., Nesterov, A.V., Arickx, Frans, and Broeckhove, Jan

Subjects
Physics
Abstract

The resonance states embedded in the three-cluster continuum of He-6 and Be-6 are obtained in the algebraic version of the resonating group method. The model accounts for a correct treatment of the Pauli principle. It also provides the correct three-cluster continuum boundary conditions by using a hyperspherical harmonics basis. The model reproduces the observed resonances well and achieves good agreement with other models. A better understanding for the process of formation and decay of the resonance states in six-nucleon systems is obtained.

Published
2001

19. On the Regularization in J-Matrix Methods.

Author

Alhaidari, Abdulaziz D., Yamani, Hashim A., Heller, Eric J., Abdelmonem, Mohamed S., Broeckhove, J., Vasilevsky, V.S., Arickx, F., and Sytcheva, A.M.

Abstract

We investigate the effects of the regularization procedure used in the J-Matrix method. We show that it influences the convergence, and propose an alternative regularization approach.We explicitly perform some model calculations to demonstrate the improvement. [ABSTRACT FROM AUTHOR]

Published
2008
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20. A microscopic three-cluster model with nuclear polarization applied to the resonances of 7Be and the reaction 6Li(p, 3He)4He

Author

Vasilevsky, V.S., Arickx, F., Broeckhove, J., and Kovalenko, T.P.

Subjects
*CLUSTER theory (Nuclear physics), *BERYLLIUM isotopes, *POLARIZATION (Nuclear physics), *GAUSSIAN processes, *BOUNDARY value problems, *NUCLEAR reactions
Abstract

Abstract: A microscopic model for three-cluster configurations in light nuclei is presented. It uses an expansion in terms of Faddeev components for which the dynamic equations are derived. The model is designed to investigate binary channel processes in a compound system. Gaussian and oscillator bases are used to expand the wave function and to represent appropriate boundary conditions. We study the effect of cluster polarization on ground and resonance states of 7Be, and on the astrophysical S-factor of the reaction 6Li(p, 3He)4He. [Copyright &y& Elsevier]

Published
2009
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23. Microscopic three-cluster model of 10Be.

Author

Lashko, Yu.A., Filippov, G.F., and Vasilevsky, V.S.

Subjects
*SCHRODINGER equation, *POLARIZATION (Nuclear physics), *RESONANCE
Abstract

We investigate spectrum of bound and resonance states in 10 Be, and scattering of alpha-particles on 6 He. For this aim we make use of a three-cluster microscopic model. This model incorporates Gaussian and oscillator basis functions and reduces three-cluster Schrödinger equation to a two-body like many-channel problem with the two-cluster subsystem being in a bound or a pseudo-bound state. Much attention is given to the effects of cluster polarization on spectrum of bound and resonance states in 10 Be, and on elastic and inelastic He 6 + α scattering. [ABSTRACT FROM AUTHOR]

Published
2017
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24. Structure of the ground and excited states in [formula omitted]Be nucleus.

Author

Nesterov, A.V., Lashko, Yu.A., and Vasilevsky, V.S.

Subjects
*EXCITED states, *SCHRODINGER equation, *DELOCALIZATION energy
Abstract

We investigate properties of bound and resonance states in the Λ 9 Be nucleus. To reveal the nature of these states, we use a three-cluster 2 α + Λ microscopic model. The model incorporates Gaussian and oscillator basis functions and reduces a three-cluster Schrödinger equation to a two-body like many-channel problem with the two-cluster subsystems ( Λ 5 He and 8Be) being in a bound or a pseudo-bound state. Influence of the cluster polarization on the energy and widths of resonance states in Λ 9 Be and on elastic and inelastic Λ 5 He + α scattering is analyzed. [ABSTRACT FROM AUTHOR]

Published
2021
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