Ruhollah Gheisari

Ruhollah Gheisari
Persian Gulf University | PGU · Department of physics

About

30
Publications
635
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69
Citations
Citations since 2017
2 Research Items
23 Citations
2017201820192020202120222023024681012
2017201820192020202120222023024681012
2017201820192020202120222023024681012
2017201820192020202120222023024681012

Publications

Publications (30)
Article
This paper develops a mathematical approach to calculate the ground state energies of μpd and μdt muonic ions. The calculations have been performed by combination of Nikiforov–Uvarov method and linear variational approach. Basis kets have been introduced to expand terms of wave function using a well definition of vector space in the hyper-spherical...
Article
In spectroscopic studies of nuclei (muonic x-ray spectroscopy and muon conversion), layered solid hydrogen targets are of key importance. The paper develops a mathematical model to optimize the dimension of solid deuterium (degrader) layer in a layered hydrogen structure of to prepare muon for the creation of muonic atoms. Muonic object balance equ...
Article
The paper deals with muonic X-ray generation by a two-layer solid hydrogen structure of H2-D2⊕sD2. The target has a high efficiency for analyzing characteristic X-rays in ion implantation. To predict the effect of the presence of protons on X-ray production, we have proposed a new kinetic schema. Muonic object equations have been written to descibe...
Article
A new model is presented herein to calculate optimal value for ultra-cold neutron (UCN) production rate of a UCN source. The cold neutron (CN) converter is the main component of UCN source. In this paper, we study the UCN source which contains the D2O neutron moderator, the sD2 converter, 590 Mev proton beam, and the spallation target (a mixture of...
Article
The U-shaped and double-sided nanostructures are promising for developing miniature angular speed sensors. While the electromechanical instability of conventional beam-type nanostructures has been extensively addressed in the literature, few researchers have investigated this phenomenon in the double-sided and U-shaped sensors. In this regard, the...
Article
We have investigated the energy distribution of μ d1sF and its spin states (F) effecting on muonic X-ray transfer yield in the solid thin film method. Argon (Ar) ion has been considered as the implanted ion in solid deuterium (sD2) layer at a temperature of T = 3 K. A kinetics model has been used, the corresponding rate equations have been construc...
Article
Full-text available
A new idea to calculate ultracold neutron (UCN) production by using Monte Carlo simulation method to calculate the cold neutron (CN) flux and an analytical approach to calculate the UCN production from the simulated CN flux was given. A super-thermal source (UCN source) was modeled based on an arrangement of D2O and solid D2 (sD2). The D2O was inve...
Article
The μd energetic atoms are produced by injection of fast muons into a solid hydrogen target of H 2/D 2, which contains a small amount of deuterium. A solid layer of D 2 has been frozen on H 2/D 2 for ion implantation. The target has been kept at low temperature ∼3 K. Once ions are implanted into such a target in experiment, characteristic muonic X-...
Article
In our earlier work [Phys. Rev. E, 82, 041701 (2010)], the bulk elastic constants were calculated using Poniewierski-Stecki expressions and the new direct correlation function. We calculated the bulk elastic constants,K11,K22 and K33 of Gay-Berne nematic liquid crystals at constant temperature and density using the expressions proposed by Stelzer a...
Article
A new effort has been undertaken to model the effect of μd 1s muonic atom loss on the number of X-rays generated by combination of negative slow muons with ions implanted in the two-layer hydrogen setup of H2/D2–D2. Until now, this effect has not been investigated theoretically. Here a solid hydrogen-deuterium layer (H2/D2) has been used for μd 1s...
Article
A variational approach using a new wave function to ttμ muonic antisymmetric molecular ion is proposed. This approach requires two terms in the total three-body wave function. The formation and fusion take place by the reason of the existence of the both Coulomb potential and nuclear absorption as the Wood–Saxon shape. The nuclear fusion rates for...
Article
This paper extends applications of the multilayered solid target H/T−D2, which is kept at 3K. The time evolutions of muonic tritium atoms (μt) are obtained, by taking into account μt production rate at different places of deuterium material. The apparatus H/T−D2 can be used for checking nuclear properties of implanted ions, which take part at muon...
Article
A variational approach using new wave functions to and muonic symmetric molecular ions is proposed. The present method is based on the calculations of the photodecay widths of muonically excited molecular states and their comparison with recent precise data. The numerical calculations were done with a short computation time. Our results are close t...
Article
Full-text available
Recently, muon catalyzed fusion in the multilayered targets H/D/T at temperature 3 K has been investigated. The latest theoretical and experimental works have confirmed that muon conversion efficiency in such multilayered systems is low. This strongly affects the muon cycling coefficient in the structure H–T/D2/H2–D2. The first layer emits tμ(1s) a...
Article
This paper deals with the optimization of the processes involved in muon catalyzed fusion. Muon catalyzed fusion (μCF) is studied in all layers of the solid hydrogen structure H/0.1%T⊕D2⊕HD. The layer H/T acts as an emitter source of energetic tμ atoms, due to the so-called Ramsauer–Townsend effect. These tμ atoms are slowed down in the second laye...
Article
The emission of tμ atoms in a two-layer arrangement consisting of H/T and D2 is investigated with an alternative kinetic model. The slowing down of tμ(1s) atoms in pure deuterium and their falling down into resonance regions force chemical confinement fusion (μCF). By considering the resonance escape probability of tμ(1s) atoms, point kinematic equ...
Article
Muon dynamics and forced chemical confinement fusion in three-layer arrangement consisting of the H/T, D2 (the degrader and moderator) and D/T fusion layers are investigated with a new kinetic model. Point kinematic equations are numerically solved to calculate the numbers of dtμ, ttμ and ddμ chain reactions. We show that the μ-cycling coefficient...
Article
The low-energy elastic cross-section in collisions of a muonic atom with the hydrogen isotope is investigated, employing a new wave function (trial) and using the coordinate-space Faddeev–Hahn model. The wave function includes non-adiabatic terms. Our results of s–wave cross-sections are given, at the tμ(1s) + d scattering. Calculated cross-section...
Article
We calculate decay widths of the metastable ppμ* ν,J molecular ion in non-adiabatic approach. The muonic molecular ion can be formed in collision of the excited pμ(2s) atoms with H2. Then, decay of the ppμ* ν,J system opens a path for the muon from pμ(2s) to pμ(1s). We employ trial wave function which includes non-adiabatic terms to calculate some...
Article
This paper provides a new effort to study of the ddμ structure. The present work is numerically performed using a new trial wave function to the ddμ system in configuration of coupled channels. The present results of energies are more accurate than those of our previous work. The obtained results of formation rates are close to results published by...
Article
Several resonances in the molecular spectrum of the exotic dtμ* ion are obtained. We present a theoretical formulation for its energy levels together with the numerical calculations for the nuclear fusion rates. The calculations are performed with the coupled rearrangement channel method, but with a set of functions alternative to others. © 2008 Wi...
Article
A variational approach using a new wave function to tt mu muonic antisymmetric molecular ion is proposed. This approach requires two terms in the total three-body wave function. The formation and fusion take place by the reason of the existence of the both Coulomb potential and nuclear absorption as the Wood-Saxon shape. The nuclear fusion rates fo...
Article
A variational approach using a new wave function to ddμ muonic molecular ion is proposed. This approach requires four terms in the total three-body wave function. The formation and fusion take place by the reason of the existence of the both Coulomb potential and nuclear absorption. The nuclear fusion rates and eigenvalues related to such levels be...
Article
A variational approach is presented employing a new wave functionfor the dtμ J ,ν muonic molecule. The work is based on the calculation of the resonant formation rate in media including HD molecules. The results are compared with those reported previously at temperatures T 3 K and are found to be in good agreement.
Article
We present a new approach to calculate the resonant energies and Columbic de-excitation rates of the ddμ* and ppμ* exotic ions. The calculations are performed with the method of coupled rearrangement channels, but with a set of basis functions alternative to others. The five lowest-lying states below the xμ(2s)+x(x≡p or d) thresholds are observed i...
Article
The charge-symmetric pseudo nucleus pdμ can be formed in the cascade process in the muon catalyzed fusion. The nuclear fusion of the pdμ molecular ion can be considered in the photon field. For the spin states of the pdμ system (L = 0), the radiative fusion rates are calculated employing a new spatial wavefunction. The method takes into account the...
Article
An approach is presented for evaluation of the muon 'sticking probability' to helium in muon-catalyzed fusion reactions. The probability of initial sticking of muon to helium in the reaction dtμ → μ4He + n is calculated variationally, employing a new wavefunction in a coupled channel method. Our results agree with the previous theoretical report. M...

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