M. S. Hussein
Max Planck Society
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Featured researches published by M. S. Hussein.
Physical Review C | 2008
C. Barbero; Alfredo P. Galeão; M. S. Hussein; F. Krmpotić
We evaluate the coincidence spectra in the nonmesonic weak decay (NMWD) {lambda}N{yields}nN of {lambda} hypernuclei {sub {lambda}}{sup 4}He, {sub {lambda}}{sup 5}He, {sub {lambda}}{sup 12}C, {sub {lambda}}{sup 16}O, and {sub {lambda}}{sup 28}Si, as a function of the sum of kinetic energies E{sub nN}=E{sub n}+E{sub N} for N=n,p. The strangeness-changing transition potential is described by the one-meson-exchange model, with commonly used parametrization. Two versions of the independent-particle shell model (IPSM) are employed to account for the nuclear structure of the final residual nuclei. They are as follows: (a) IPSM-a, where no correlation, except for the Pauli principle, is taken into account and (b) IPSM-b, where the highly excited hole states are considered to be quasistationary and are described by Breit-Wigner distributions, whose widths are estimated from the experimental data. All np and nn spectra exhibit a series of peaks in the energy interval 110 MeV <E{sub nN}<170 MeV, one for each occupied shell-model state. Within the IPSM-a, and because of the recoil effect, each peak covers an energy interval proportional to A{sup -1} , going from congruent with 4 MeV for {sub {lambda}}{sup 28}Si to congruent with 40 MeV for {sub {lambda}}{sup 4}He. Such a description could be pretty fair for themorexa0» light {sub {lambda}}{sup 4}He and {sub {lambda}}{sup 5}He hypernuclei. For the remaining, heavier, hypernuclei it is very important, however, to consider as well the spreading in strength of the deep-hole states and bring into play the IPSM-b approach. Notwithstanding the nuclear model that is employed the results depend only very weakly on the details of the dynamics involved in the decay process proper. We propose that the IPSM is the appropriate lowest-order approximation for the theoretical calculations of the of kinetic energy sum spectra in the NMWD. It is in comparison to this picture that one should appraise the effects of the final-state interactions and of the two-nucleon-induced decay mode.«xa0less
International Journal of Bifurcation and Chaos | 2012
Murilo S. Baptista; J. X. de Carvalho; M. S. Hussein; Celso Grebogi
This work clarifies the relationship between network circuit (topology) and behavior (information transmission and synchronization) in active networks, e.g. neural networks. As an application, we show how to determine a network topology that is optimal for information transmission. By optimal, we mean that the network is able to transmit a large amount of information, it possesses a large number of communication channels, and it is robust under large variations of the network coupling configuration. This theoretical approach is general and does not depend on the particular dynamic of the elements forming the network, since the network topology can be determined by finding a Laplacian matrix (the matrix that describes the connections and the coupling strengths among the elements) whose eigenvalues satisfy some special conditions. To illustrate our ideas and theoretical approaches, we use neural networks of electrically connected chaotic Hindmarsh–Rose neurons.
Physics Letters A | 2008
J. X. de Carvalho; M. S. Hussein; M. P. Pato; A. J. Sargeant
We discuss the applicability, within the random matrix theory, of perturbative treatment of symmetry breaking to the experimental data on the flip symmetry breaking in quartz crystal. We found that the values of the parameter that measures this breaking are different for the spacing distribution as compared to those for the spectral rigidity. We consider both two-fold and three-fold symmetries. The latter was found to account better for the spectral rigidity than the former. Both cases, however, underestimate the experimental spectral rigidity at large L. This discrepancy can be resolved if an appropriate number of eigenfrequencies is considered to be missing in the sample. Our findings are relevant for symmetry violation studies in general.
Physics Letters B | 2009
E. Bauer; A. P. Galeão; M. S. Hussein; F. Krmpotić; Joseph D. Parker
To comprehend the recent Brookhaven National Laboratory experiment E788 on
Physical Review C | 2008
W. H. Z. Cardenas; M. S. Hussein; L. F. Canto; J. Lubian
^4_Lambda
Physical Review C | 2015
D. R. Otomar; P. R. S. Gomes; J. Lubian; L. F. Canto; M. S. Hussein
He, we have outlined a simple theoretical framework, based on the independent-particle shell model, for the one-nucleon-induced nonmesonic weak decay spectra. Basically, the shapes of all the spectra are tailored by the kinematics of the corresponding phase space, depending very weakly on the dynamics, which is gauged here by the one-meson-exchange-potential. In spite of the straightforwardness of the approach a good agreement with data is acheived. This might be an indication that the final-state-interactions and the two-nucleon induced processes are not very important in the decay of this hypernucleus. We have also found that the
Physical Review C | 2012
D. R. Otomar; P. R. S. Gomes; J. Lubian; L. F. Canto; M. S. Hussein
pi+K
Journal of Physics A | 2008
M. S. Hussein; Weibin Li; Sebastian Wüster
exchange potential with soft vertex-form-factor cutoffs
American Journal of Physics | 2008
Sadhan K. Adhikari; M. S. Hussein
(Lambda_pi approx 0.7
Physical Review C | 2013
D. R. Otomar; P. R. S. Gomes; J. Lubian; L. F. Canto; M. S. Hussein
GeV,