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## Publications

Publications (158)

This article reports on the scattering of unpolarized and spin polarized electrons and positrons from 28Ni58,29Cu63,46Pd108, and 78Pt196, covering light to heavy precious metal targets. To cover the wide energy domain of 1 eV ≤Ei≤300 MeV, Dirac partial-wave phase-shift analysis is employed, using a complex optical potential for Ei≤1 MeV and a poten...

Using the single scattering independent model (IAM) along with the screening correction (IAMS) the differential, integrated elastic, inelastic, total (elastic + inelastic), momentum transfer and viscosity cross sections for both positron and electron impact elastic scattering from HCN molecule are evaluated for 1 eV-1 MeV. For this system, the spin...

The experimental differential cross section of the 12C+12C elastic scattering over a wide laboratory energy scale 25 ≦ Elab ≦ 360 MeV are analyzed within the framework of the optical model (OM) using non-monotonic (NM) nucleus-nucleus potential. The real parts of the NM potentials are derived from the energy density functional (EDF) formalism with...

This work illustrates, for the first time, the analysis of tensor analyzing powers ( T 20 , T 21 , T 22 ) along with the differential cross-section (CS) and the vector analyzing power iT 11 for the ⁶ Li+ ¹² C elastic scattering at 30 and 50 MeVwithin the framework of an optical model (OM) using microscopic shallow non-monotonic (NM) potentials. The...

Goldberg criterion' [Goldberg and Smith, Phys. Rev. Lett. 29 (1972) 500] tells that at sufficiently high energies, where pronounced refractive scattering with nuclear rainbow oscillations are followed by an 'exponential-type falloff' in the angular distribution, discrete ambiguities are eliminated for the deep monotonic potential. The criterion is...

The experimental differential cross-sections of 16O + 16O elastic scattering in the energy range 75 MeV ≤ Elab ≤ 1120 MeV are analysed using families of non-monotonic (NM) shallow nucleus–nucleus potential in the framework of the optical model. The experimental data is reproduced successfully using six families of NM potentials. It is found that al...

Digital modeling has the possibility of analyzing its data that represent reality more clearly، so a cartographic hydrological model was conducted by overlying models with maps layers to (potential erosion coefficients PAP_CAR، wells and runoff (SCS-CN) and cold wet climate model)،while geomorphic modeling through overlying (slope، geological map،...

A review on recent calculations of the differential, integrated and total cross sections along with the spin polarization parameters for the elastic collisions of electrons and positrons with various atomic targets, involving larger atomic number (48≤ Z ≤82), is presented for the energy range 1 eV ≤ Ei ≤ 1 GeV. Also are analyzed the critical minima...

This work reports, for the first time, the analysis of tensor analyzing powers ( T 20 , T 21 , T 22 ) along with the differential cross-section (CS) and the vector analyzing power iT 11 for the ⁶ Li + ¹² C elastic scattering at 30 and 50 MeV within the framework of an optical model (OM) using microscopic shallow non-monotonic (NM) potentials. The N...

A theoretical investigation on differential, integral, momentum transfer, viscosity cross sections and spin polarization for elastically scattered electrons and positrons from Ar atoms in the energy range
1eV ≤Ei≤0.5 GeV is presented. In addition, we have studied the critical minima in the elastic differential cross sections, and the absorption, to...

A theoretical investigation on differential, integral, momentum transfer, viscosity cross sections and spin polarization for elastically scattered electrons and positrons from Ar atoms in the energy range 1 eV ≤ E i ≤ 0.5 GeV is presented. In addition, we have studied the critical minima in the elastic differential cross sections, and the absorptio...

A complex optical potential, in the framework of Dirac partial wave analysis, is employed to study the minima in the differential cross sections (DCSs) and the spin polarization due to the elastic scattering of electron by Pb atom. In addition, integral, momentum-transfer, absorption, viscosity and total cross sections are also reported for the ene...

With a complex optical potential, , the Dirac relativistic equation is solved, employing the partial wave technique, to evaluate the differential, integrated, momentum transfer and viscosity cross-sections for the elastic scattering of -Hg system over the incident energy range of 1.0 eV 10.0 keV. We also calculate the inelastic and grand total cros...

Electron impact inner-subshell (L and M) ionization cross sections for various atoms (14≤Z≤92) are calculated and compared with experimental and other theoretical results.

The Sternglass theory [Sternglass, Phys. Rev. 108, (1957) 1] for fast-ion-induced secondary electron emission, which is proportional to the stopping powers, has been modified to calculate the electron impact secondary electron yield from both elemental and compound targets with atomic number Z = 4 - 92 for incident energy range 5 ≤ Ei ≤ 10⁵ eV. Thi...

A simple modification of the Vaisburd and Evdokimov model (VE) [Russ. Phys. J. 46, 1160 (2003)], with a acronym MVE, embodying the relativistic effects is proposed and employed to evaluate the K-shell ionization cross sections of atomic targets with atomic numbers 6 ≤ Z ≤ 92 for incident energies E_Threshold ≤ E ≤ 10 GeV. For a meaningful compariso...

The di�erential, integrated elastic, total and momentum transfer cross sections along with
Sherman function for the elastic scattering of electrons and positrons by cadmium atom have
been evaluated from the partial wave solution of the Dirac relativistic scattering equations for
a projectile-atom complex potential at the energy range 6.4 eV<E<1.0 k...

The elastic, differential and integrated, and total cross sections for the scattering of electrons and positrons by magnesium atom have been calculated. These calculations are done within the framework of complex electron/positron-atom optical potential and relativistic Dirac partial wave analysis at the impact energies 0.1–1000 eV for both the pro...

Stopping cross sections (SCS) for protons, alphas and Li ions are calculated with a modified form of our earlier work by incorporating a different electron density distribution of target materials; this involves four parameters – two projectile dependent and the rest two remain fixed. The prosed model has been tested for three stripped ion (H$^+$,...

We propose an extension of our recently modified simplified-improved-binary-encounter dipole
(MUIBED) model [1] suitable even for relativistic energies. This new model (XMUBED) is applied to calculate
the electron impact single M-subshell ionization cross-sections for atomic targets with various charges Z (79 £ Z£ 92). The parameters of the MUIBED...

Nonmonotonic (NM) nucleus-nucleus potentials from the energy-density functional (EDF) theory including the Pauli principle have been considered for the nuclear incompressibility K in the range 188-266 MeV. The experimental cross sections of the O16+O16 elastic scattering over the 31-350 MeV incident energies have been analyzed in the optical model...

The differential, total, and momentum transfer cross sections along with the minima in the differential cross sections (DCSs) and the Sherman function S() for the elastic scattering of electrons by calcium atoms have been calculated. These calculations are done within the framework of complex electron–atom optical potential and relativistic dynami...

Experimental differential cross sections of α elastic scattering by 90Zr in the 15.0–141.7 MeV range of the bombarding energies have been analysed within the framework of an optical model using non-monotonic (NM) potentials. These potentials are generated from the energy-density functional theory using a realistic two-nucleon potential coupled with...

The model of Cengiz (2002) [Approximate inelastic scattering cross
sections of electrons. Rad. Phys. Chem. 65, 33-44] has been
modified by incorporating both the ionic and relativistic corrections
due to Uddin et al. (2006) [Modified Kolbensvedt model for the electron
impact K-shell ionization cross-sections of atoms and ions. Eur. Phys.
J. D 37, 3...

This work compares the performance of the traditional phenomenological Woods–Saxon (WS) and squared WS (SWS) potentials with that of a non-monotonic (NM) potential, for 6Li elastic scattering by targets of a wide range, namely 24,25,26Mg, 27Al, 40,44Ca, 59Co, 60Ni, 197Au and 206,208Pb at an incident energy of 88 MeV. The real part of this NM potent...

The real parts of the alpha-alpha and alpha-nucleus potential, particularly for 40,44,48Ca and 58Ni targets are determined from a realistic two-nucleon potential using an energy-density functional approach and are found to be non-monotonic with a short range repulsion in their functional forms that are similar to those needed in accounting for elas...

The data on the elastic scattering cross-section (CS) and vector analyzing power (VAP) of 6,7Li incident on 12C , 26Mg, 58Ni and 120Sn nuclei are analyzed in terms of an optical model (OM) potential, the real part of which is generated from a realistic two-nucleon interaction using the energy-density functional (EDF) formalism. The EDF-generated re...

Recently proposed extension of the empirical model (BELL) of Bell et al. (J Phys Chem Ref Data 1983, 12, 891) with incorporation of the quantum mechanical form of orbital radius from the DM model and a nonlinear feature in addition to the ionic and relativistic corrections is examined for electron-impact single ionization in the K-, L-, and M-shell...

Experimental cross section (CS) and vector analyzing power (VAP) data of the 6Li–28Si elastic scattering at 22.8 MeV are analyzed in the coupled-channels (CC) and coupled discretized continuum channels (CDCC) methods. Non-monotonic (NM) 6Li and α potentials of microscopic origin are employed, respectively, in the CC calculations and to generate fol...

An extension of the analytical model of Campos et al (2007 J. Phys. B: At. Mol. Opt. Phys. 40 3835) is proposed to evaluate electron impact single inner-shell ionization cross sections up to the M-shell. The new model includes ionic and relativistic factors in its structure and describes neatly the K-shell ionization cross section data up to 2 GeV,...

The recently proposed generalized Kolbenstvedt model (GKLV) of Haque et al (2007 Eur. Phys. J. D 42 203), for the electron impact ionization (EII) of atoms, was applied to a wide range of K-, L- and M-shell electrons of ionic targets from threshold to 1 MeV incident energy. The set of species-independent parameters, two for each of the ionized orbi...

The knowledge of inner-shell ionization cross sections has not only fundamental importance for understanding collision dynamics of electron-atom interactions, etc, but also is used extensively in many applied fields such as radiation science, astrophysics, plasma physics, etc. The enormous demands of ionization cross sections can only be met by sui...

This work compares the performance of traditional phenomelogical Woods-Saxon (WS) and squared WS (SWS) potentials with that
of a non-monotonic (NM) potential, microscopically derived using the energy-density functional (EDF) formalism from a realistic
two-nucleon potential that includes the Pauli priciple. The experimental differential cross-sectio...

The huge demand and scarcity of electron impact ionization cross sections (EIICS) that are essential not only in modeling but also in basic researches can be best filled in by simple to use analytical models [1] that are sufficiently accurate and provide fast generation of EIICS data over wide domain. We report few such models and compare their pro...

The electron impact K-shell ionization cross sections (EIKICS) are needed in diverse fields, such as plasma-, radiation-, astro-physics. For plasma modeling the demand of EIKICS is enormous; this can only be fulfilled by simple analytical or semi-classical models that can generate efficiently accurate results over broad ranges of projectile energie...

Electron impact single ionization cross sections (EIICS) of 40 K-, 11 L-, 3 M-shell and 3 L-subshell atomic targets, ranging from H to U, are evaluated using the generalized parameters of recently propounded analytical model [Campos C. S, et al 2007, J. Phys. B: At. Mol. Opt. Phys. 40, 3835] by incorporating the relativistic and ionic factors in it...

A new semiempirical model comprising few important features of the DM model of Deutsch et al. (Int J Mass Spectrom 1998, 177, 47) and the widely used empirical model of Bell et al. (J Phys Chem Ref Data 1983, 12, 891) has been proposed. The proposed model has been examined to evaluate the electron impact K-shell ionization cross sections of 30 atom...

A simple modification of the revised Deutsch–Märk model (RDM) [Deutsch et al., Int J Mass Spectrom 2004, 233, 13] incorporating both the ionic and relativistic corrections is proposed to investigate the K-shell ionization of 30 atomic targets with atomic numbers Z = 1–92 for incident energies up to 2 GeV. We also revisit our earlier models: modifie...

A simple modification of the Vaisburd and Evdokimov model (VE) [Russ. Phys. J. 46, 1160 (2003)], with a acronym MVE, embodying the relativistic effects is proposed and employed to evaluate the K-shell ionization cross sections of atomic targets with atomic numbers 6 ≤Z≤ 92 for incident energies EThreshold ≤ E ≤ 10 GeV. For a meaningful comparison w...

The experimental differential cross-sections for the 6Li elastic scattering by 28Si over the incident energies ELi=7.5–99.0 MeV and vector analyzing power data at 22.8 MeV have been analyzed in terms of a non-monotonic potential, microscopically derived from the energy-density functional (EDF) theory using a realistic two-nucleon potential that inc...

The present status of the alpha-nucleus potential, generated from the energy density functional (EDF) formalism using a realistic two-nucleon potential, which incorporates the Pauli principle, is discussed. The EDF potentials, calculated using a density distribution of alpha-particle that yields a binding energy of 20 MeV with a reasonable root-mea...

The present status of the α-nucleus potential, generated from the energy density func-tional (EDF) formalism using a realistic two-nucleon potential, which incorporates the Pauli principle, is discussed. The EDF potentials, calculated using a density distribution of α-particle that yields a binding energy of 20 MeV with a reasonable root-mean-squar...

A simple modification of the empirical model of Deutsh et. al. [1] by incorporating both the ionic [2] and relativistic corrections [3] is proposed for evaluating the electron impact K -shell ionization cross sections of neutral atomic targets. Present results for 30 atomic targets with atomic number Z=1 -- 92 for incident energies up to E=2 GeV, a...

The electron impact K-shell ionization (EIKSI) cross sections on 18 atomic targets, with the atomic numbers 2 ≤ Z ≤ 92, are calculated using a modified version of the binary encounter approximation (BEA) model. The modified BEA (MBEA), which incorporates both ionic and relativistic corrections and is simpler in application than other existing model...

The electron impact ionization phenomena have fundamental importance
ranging from plasma to astro-physics. Reliable K-shell ionization cross
sections (KSICS) are needed for various quantitative analyses. Even the
first order quantal calculations are rather both lengthy and not too
easy to implement for various modeling calculations. We propose a
pa...

A simple empirical formula is proposed for the rapid
calculation of electron impact total ionization cross sections both for the
open- and closed-shell neutral atoms considered in the range 1≤
Z≤92 and the incident electron energies from threshold to about
104 eV. The results of the present analysis are compared with the
available experimental...

We propose an extension of the modified simplified-improved-binary-encounter dipole (MRIBED) model (Uddin et al., Phys Rev A 2005, 72, 032715), incorporating both the ionic and relativistic corrections, to investigate the K-shell ionization of atomic targets with atomic numbers Z = 1 − 92 for incident energies up to 2 GeV. We also revisit our earli...

The real parts of the alpha-alpha and alpha-nucleus potential, particularly for 40,44,48Ca and 58Ni targets are determined from a realistic two-nucleon potential using an energy-density functional approach and are found to be non-monotonic with a short range repulsion in their functional forms that are similar to those needed in accounting for elas...

The recently modified Kolbenstvedt (MKLV) model [Eur. Phys. J. D 37, 361 (2006)], developed for electron impact ionization (EII) of the K-shell atomic targets, has been extended to generalize
its two parameters in terms of the electronic orbitalsnl. The generalized MKLV
(GKLV) with two sets of the species independent parameters for the samenl,
one...

A modified version of the original Kolbenstvedt model, which has its roots in quantum electrodynamical description of electron-electron scattering, will be presented. This modified model describes reasonably well cross sections of K-shell ionization of H, He, Li, C, N, O, Mg, Si, P and S, L-shell ionization of Ag, Sn, Ba, Ho, Ta, Au, Pb, Bi and U,...

The demands of the electron impact ionization cross sections in diverse fields are enormous. And this is hard to fulfill either by experimental or ab initio calculations. So various analytical and semi-classical models are applied for a rapid generation of ionization cross sections accurately. We have applied a modified version [1] of the Bell et....

Electron impact ionization cross sections are at the heart of many
active fields ranging from astro- to medical- physics. These
applications require cross sections for a wide range of species as a
function of projectile energies. This demand, however, is very hard to
fulfill neither by experiments nor ab initio calculations. Various
analytical and...

The modified BELL (MBELL) formula (Haque et al 2006 Phys. Rev. A 73 012708) has been applied to the M-shell ionization of neutral and ionic atoms to deduce the `generalized' parameters of the 3s, 3p and 3d orbits. A single set of parameters for each of these orbits and that previously determined for each of 1s, 2s and 2p orbits can reproduce satisf...

Experimental differential cross sections for elastic scattering of two α particles have been fitted with an l-independent non-monotonic real potential up to 34.2 MeV (lab) and a complex potential with non-monotonic real part from 35.1 to 47.3 MeV (lab). The calculated phase shifts, in general, agree with those derived from the phase shift analyses...

The parameters of our recent modification of BELI formula (MBELL) [A.K.F. Haque, M.A. Uddin, A.K. Basak, K.R. Karim, B.C. Saha, Phys. Rev. A 73 (2006) 012708] are generalized in terms of the orbital quantum numbers nl to evaluate the electron impact ionization (EII) cross sections of a wide range of isoelectronic targets (H to Ne series) and incide...

The electron impact ionization cross-sections of mono- and di-positive ionic targets are calculated using a second version of the modified binary-encounter-dipole (MBED) model, previously reported [M A Uddinet al, J. Phys.
B37, 1909 (2004)]. The present version differs from the previous one in the scale factor of the Burgess denominator and is appl...

The 16O + 12C elastic scattering data have been well described, for the first time, with a shallow folded potential obtained from a single folding method. The constituent parameters of the potential, excepting one, for its real part are generated from the nucleon–16O and α–16O potentials, and the cluster structure of 12C. Only the repulsive part of...

Electron impact ionization cross sections �EIICS� of 30 L-shell targets, with open- and closed-shell configurations
in the isoelectronic sequences ranging from Li to Ne, are evaluated using the generalized parameters of
our recent modification of BELL formula �MBELL� �Haque et al., Phys. Rev. A 73, 012708 �2006��. Three
sets of parameters, one each...

A modification of the Kolbensvedt model, MKLV, in terms of ionic, correlation
(between the incident and target electrons) and relativistic corrections, is
proposed to calculate the K-shell electron impact ionization cross-sections
of neutral and ionic targets. The modified model, with a single set of
parameters, is found to reproduce satisfactorily...

The total cross-sections of electron impact single K-shell ionization of C, N, O, Cr, Mn, Fe, Cu, Ga, Ge and Zr atoms are computed using the previously propounded relativistic and non-relativistic BED, relativistic DM and Gryzinski models. We also propose a hybrid RDM model combining the relativistic component of the Gryzinski model with the non-re...

Previously developed BEB, RBEB, DM and recently developed RDM models are employed for the computation of cross-sections of electron impact single K-shell ionization of atoms with atomic numbers from Z = 19 to 103 to augment the work recently done involving atoms with Z = 6 to 40. The calculated cross-sections are compared with the available experim...

The cross-sections for electron impact ionization of hydrogenic atoms from Z = 1 to 92 are calculated using a newly propounded parameter-free relativistic binary encounter (RBEA) model. The predictions from the RBEA model are compared with those of the previously developed analytical BEQ-RBEQ and DM models, and distorted wave calculations along wit...

A simple modification of the empirical model of Hombourger (HEMP) [1998 J. Phys. B 31 3693] is proposed with ionic and relativistic corrections in it. The modified HEMP (MHEMP) model has been applied to 11 H- and He-like ionic targets with a wide range of atomic numbers Z = 5–92 to calculate the electron impact single ionization (EISI) cross sectio...

The total cross sections of electron-impact single-K-shell ionization of 14 atomic targets ranging from H to U 1 Z 92 are calculated using a modified version of the BELI formula Bell et al., J. Phys. Chem. Ref. Data 12, 891 1983 by incorporating both ionic and relativistic corrections in it. The proposed modified Bell model with a single set of par...