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Anisotropy of the angular distribution of fission fragments in heavy-ion fusion-fission reactions: The influence of the level-density parameter and the neck thickness (2013)

D. Naderi, M. R. Pahlavani, and S. A. Alavi

American Physical Society (APS)

In: Physical Review C

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Publikationsdatum: 2013-05-24

Beschreibung: Author(s): D. Naderi, M. R. Pahlavani, and S. A. Alavi Using the Langevin dynamical approach, the neutron multiplicity and the anisotropy of angular distribution of fission fragments in heavy ion fusion-fission reactions were calculated. We applied one- and two-dimensional Langevin equations to study the decay of a hot excited compound nucleus. The infl... [Phys. Rev. C 87, 054618] Published Thu May 23, 2013

Schlagwort(e): Nuclear Reactions

Print ISSN: 0556-2813

Digitale ISSN: 1089-490X

Thema: Physik

Publiziert von American Physical Society (APS)

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Projector Quantum Monte Carlo Method for Nonlinear Wave Functions (2017)

Lauretta R. Schwarz, A. Alavi, and George H. Booth

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2017-04-27

Beschreibung: Author(s): Lauretta R. Schwarz, A. Alavi, and George H. Booth We reformulate the projected imaginary-time evolution of the full configuration interaction quantum Monte Carlo method in terms of a Lagrangian minimization. This naturally leads to the admission of polynomial complex wave function parametrizations, circumventing the exponential scaling of the appro… [Phys. Rev. Lett. 118, 176403] Published Tue Apr 25, 2017

Schlagwort(e): Condensed Matter: Electronic Properties, etc.

Print ISSN: 0031-9007

Digitale ISSN: 1079-7114

Thema: Physik

Publiziert von American Physical Society (APS)

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Investigation of heavy-ion fusion with deformed surface diffuseness: Actinide and lanthanide targets (2017)

S. A. Alavi and V. Dehghani

American Physical Society (APS)

In: Physical Review C

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Publikationsdatum: 2017-05-04

Beschreibung: Author(s): S. A. Alavi and V. Dehghani By using a deformed Broglia-Winther nuclear interaction potential in the framework of the WKB method, the near- and above-barrier heavy-ion-fusion cross sections of O 16 with some lanthanides and actinides have been calculated. The effect of deformed surface diffuseness on the nuclear interaction pot… [Phys. Rev. C 95, 054602] Published Tue May 02, 2017

Schlagwort(e): Nuclear Reactions

Print ISSN: 0556-2813

Digitale ISSN: 1089-490X

Thema: Physik

Publiziert von American Physical Society (APS)

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Digitale Medien

Displacement and distortion of the ammonium ion in rotational transition states in ammonium fluoride and ammonium chloride (1999)

Alavi, A. ; Lynden-Bell, R. M.

College Park, Md. : American Institute of Physics (AIP)

The Journal of Chemical Physics 110 (1999), S. 5861-5865

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ISSN: 1089-7690

Quelle: AIP Digital Archive

Thema: Physik , Chemie und Pharmazie

Notizen: Ab initio density functional calculations have been carried out on ammonium fluoride to determine the equilibrium structure and the transition state for rotation of the ammonium ion. The calculated equilibrium geometry agrees satisfactorily with crystallographic data. Optimization of the crystal geometry in the transition state for rotation results in significant distortion and displacement of the ammonium ion within the unit cell. Upon reexamination of the rotational transition states in ammonium chloride, similar distortion and displacement of the ammonium ion are found. The rotation process is similar to a carousel motion, in which the ion moves along the rotation axis and changes shape as it rotates. These results show that rigid ion models for ammonium ion rotational dynamics in crystals are, at best, incomplete. © 1999 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.478485

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Digitale Medien

Grand-canonical simulations of solvated ideal fermions. Evidence for phase separation (1992)

Alavi, A. ; Frenkel, D.

College Park, Md. : American Institute of Physics (AIP)

The Journal of Chemical Physics 97 (1992), S. 9249-9257

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ISSN: 1089-7690

Quelle: AIP Digital Archive

Thema: Physik , Chemie und Pharmazie

Notizen: A novel scheme to perform finite-temperature grand-canonical simulations of ideal fermions in arbitrary external potentials is introduced. This scheme is based on the evaluation of the grand-canonical function of lattice fermions. As an application, we present results on the phase behavior of a mixture of fermions and hard spheres. A simple analytic model of solvated fermions in a hard-sphere fluid is also studied. We address here the possibility of phase separation between a pure delocalized phase of fermions and a homogeneous solution of solvated fermions. These calculations indicate that the homogeneous phase is expected to be stable only at low fermion concentration and low thermal wavelengths. The fermion simulations indicate that such phase separation is a likely scenario.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.463300

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The structure and spectroscopy of monolayers of water on MgO: An ab initio study (2000)

Delle Site, L. ; Alavi, A. ; Lynden-Bell, R. M.

College Park, Md. : American Institute of Physics (AIP)

The Journal of Chemical Physics 113 (2000), S. 3344-3350

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ISSN: 1089-7690

Quelle: AIP Digital Archive

Thema: Physik , Chemie und Pharmazie

Notizen: The structure and energetics of a monolayer of water on a perfect MgO substrate is investigated by ab initio calculations. Several minima in the potential energy surface were found including both physisorbed and chemisorbed states in which one third of the water molecules were dissociated. In the more stable of the physisorbed states, the water molecules were not all parallel to the surface, but some showed hydrogen bonding with surface oxygen ions. Even in the physisorbed state, the geometry of these surface H-bonded water molecules were distorted relative to the bulk. One of the stable chemisorbed states was the same as that found in earlier work by Giordano et al. [Phys. Rev. Lett. 81, 1271 (1998)]. Two more stable chemisorbed structures were found in which strong hydrogen bonds to the hydroxide ions in the water layer were formed. The existence of different minima appears to be the result of a subtle interplay between hydrogen bonding between adsorbed species and with the surface oxide ions. Harmonic vibrational frequencies were determined for both a chemisorbed and a physisorbed states and spectroscopic features which should discriminate between chemisorbed and physisorbed states are identified. © 2000 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1287276

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