2-5 May 2017
Florida Science Campus (UNISA)
Africa/Johannesburg timezone
The symposium is in memory of the late Prof. SA Sofianos, a distinguished Physicist who served UNISA and the Few-body Physics community all his life.
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Displaying 11 contributions out of 11
3
Session: Oral Sessions
on 2 May 2017 at 10:30
Type: Oral Presentation Session: Oral Sessions
Track: Oral Presentations
Our two recent developments will be presented. 1) We confirm the reliability of the well-known Alt’s Coulomb renormalization method (CRM). It is found that the CRM is only available for a very- long-range screened Coulomb potential (SCP), where asymptotic property can be satisfied. However, such an SCP calculation in momentum space is considerably difficult because of the cancelation of signifi ... More
Presented by Prof. Oryu SHINSHO
Type: Oral Presentation Session: Oral Sessions
Track: Oral Presentations
We consider a momentum-space multi-channel Hamiltonian that underwent the complex rotation, a kind of inhomogeneous complex scaling. Isolated non-real eigenvalues of this Hamiltonian are called the complex rotation resonances. For a class of sufficiently rapidly decreasing and analytic interactions, we prove that the complex rotation resonances do correspond to the scattering matrix resonances, th ... More
Presented by Prof. Alexander MOTOVILOV
Type: Oral Presentation Session: Oral Sessions
Track: Oral Presentations
A new class of Artificial Neural Networks is described incorporating a node density function and functional weights. This network containing an infinite number of nodes, excels in generalizing and possesses a superior extrapolation capability.
Presented by Prof. Isaac LAGARIS
Type: Oral Presentation Session: Oral Sessions
Track: Oral Presentations
The van der Waals three-body systems at ultralow energies are studied using Faddeev equations in configuration space. The spectra of LiHe2 are calculated. The results obtained indicate on the Efimov character of the excited states.
Presented by Dr. Elena KOLGANOVA
Type: Oral Presentation Session: Oral Sessions
Track: Oral Presentations
We study the 6Li breakup on different target masses in order to investigate the dependence of continuum-continuum couplings and Coulomb-nuclear interference on the target mass. We show that excluding the continuum-continuum couplings, the integrated total and nuclear breakup cross sections decrease linearly as function of A_T^{1/3}, while the integrated Coulomb breakup decrease linearly as functio ... More
Presented by Dr. Bahati MUKERU
Type: Oral Presentation Session: Oral Sessions
Track: Oral Presentations
The two-variable integrodifferential equation for few-body systems is solved using the Lagrange-mesh method. The method transforms the equation into a system of algebraic equations that are solved as a non-symmetric matrix eigenvalue problem. Convergence properties of the solution in relation to the problem parameters is investigated. The accuracy of the converged solution is tested by calculating ... More
Presented by Prof. Gaotsiwe Joel RAMPHO
Type: Oral Presentation Session: Oral Sessions
Track: Oral Presentations
One of the most important subjects in physics is to calculate few-body Schroedinger equation accurately. By solving the equation, we can predict various observable before measurement and can obtain new understanding. For this purpose, it is necessary to develop the method to calculate three- and four-body problems precisely and to apply to various fields such as nuclear physic as well as atomic p ... More
Presented by Prof. Emiko HIYAMA
Type: Oral Presentation Session: Oral Sessions
Track: Oral Presentations
We have developed the formalism of the Jost function method (JFM) to study unstable nuclei. The component of the unbound states becomes important in the field of quantum systems where open channels are included in the system, e.g. study of unstable nuclei. From the aspect of the few-body treatment, the position of the S-matrix pole is a crucial key to characterize the system. The pole position can ... More
Presented by Prof. Hiroshi MASUI
Type: Oral Presentation Session: Oral Sessions
Track: Oral Presentations
A new method for finding the partial decay-widths for multi-channel resonances is suggested. It is based on using the Jost matrices. These matrices can be either calculated (when the multi-channel potential is known) or found by fitting experimental data (when they are available). In both cases the procedure for obtaining the partial widths is the same and is simple. It does not require any kind ... More
Presented by Prof. Sergi RAKISTIANSKI
Type: Oral Presentation Session: Invited Talks
Track: Oral Presentations
Low-energy scaling properties of three-body systems are investigated, by considering the elastic $s-$wave collision of a particle in a bound-state formed by the remaining two-body system. In the first part of my presentation I will concentrate in the case of the halo nucleus $^{20}$C, where we have examined the neutron$-^{19}$C scattering properties near the critical condition for the occurrence ... More
Presented by Prof. LAURO TOMIO