Signature of void probability scaling in multipion production at a few GeV∕nucleon

Ghosh, Dipak; Deb, Argha; Bhattacharyya, Swarnapratim; Ghosh, Jayita

doi:10.1103/physrevc.69.027901

Cited by 18 publications

(40 citation statements)

References 15 publications

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“…We measured the mass distributions of fission fragments and pre-scission neutron multiplicity for the 16 O + 238 U system [14]. While the pre-scission neutron multiplicity was found to be consistent with the statistical model prediction, we found anomalous increase in the width of mass distribution near the Coulomb barrier energies (figure 1), signifying the presence of quasifission reaction.…”

Section: Mass Distribution As a Probe To Study Quasifissionmentioning

confidence: 63%

“…In fact, measurement of ER cross-section and fragment angular anisotropy provided contradictory conclusions regarding the presence/absence of QF in the 16 O + 238 U reaction. The system is highly fissile and target is deformed and therefore is a probable candidate for quasifission at near-barrier energies.…”

Section: Mass Distribution As a Probe To Study Quasifissionmentioning

confidence: 99%

“…Anomalous increase of fission fragment angular anisotropy compared to statistical model has been observed for this system at near-barrier energies, which indicates a significant contribution from quasifission reaction. By assuming that the effect of quasifission is predominant in the sub-barrier region, where the orientation of the deformed target-projectile system is crucial to determine the fusion trajectory, Hinde et al [4] explained the anomalous energy dependence of fragment anisotropy for the 16 O + 238 U system and concluded that there is a quasifission reaction at sub-barrier energies. On the contrary, the crosssections of the evaporation residues measured for the same system at the near and subbarrier energies were reported [13] to be consistent with the statistical theory, indicating that the contribution from quasifission is not significant.…”

Section: Mass Distribution As a Probe To Study Quasifissionmentioning

confidence: 99%

“…While the pre-scission neutron multiplicity was found to be consistent with the statistical model prediction, we found anomalous increase in the width of mass distribution near the Coulomb barrier energies (figure 1), signifying the presence of quasifission reaction. It is evident from the extensive study of the 16 O + 238 U system that mass and angular distributions of fission fragments are more sensitive probes than the to ER cross-section or neutron multiplicity measurement in concluding the presence/absence of quasifission in heavy-ion-induced fission reaction with highly fissile targets.…”

Section: Mass Distribution As a Probe To Study Quasifissionmentioning

confidence: 99%

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Fusion–fission dynamics studies using mass distribution as a probe

et al. 2015

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Study of quasifission reaction mechanism and shell effects in compound nuclei has important implications on the synthesis of superheavy elements (SHE). Using the major accelerator facilities available in India, quasifission reaction mechanism and shell effects in compound nuclei were studied extensively. Fission fragment mass distribution was used as a probe. Two factors, viz., nuclear orientation and direction of mass flow of the initial dinuclear system after capture were seen to determine the extent of quasifission. From the measurement of fragment mass distribution in α-induced reaction on actinide targets, it was possible to constrain the excitation energy at which nuclear shell effect washed out.

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Section: Mass Distribution As a Probe To Study Quasifissionmentioning

confidence: 63%

Section: Mass Distribution As a Probe To Study Quasifissionmentioning

confidence: 99%

Section: Mass Distribution As a Probe To Study Quasifissionmentioning

confidence: 99%

Section: Mass Distribution As a Probe To Study Quasifissionmentioning

confidence: 99%

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Fusion–fission dynamics studies using mass distribution as a probe

et al. 2015

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“…The nature and energy of the newly formed BOL bond play a pivotal role in the energetics of the donoracceptor complex formation reaction by boron trifluoride molecule. Recently we reported a detailed molecular orbital and density functional study [7] of the event and consequence of the structural reorganization of BF 3 before the event of a chemical reaction, as well as the mechanism and the rationale of charge transfer between the interacting fragments BF 3 and NH 3 , leading to the formation of the coordination compound, F 3 B-NH 3 .…”

Section: Introductionmentioning

confidence: 99%

Computation of quantum mechanical hybridization and dipole correlation of the electronic structure of the F₃B–NH₃supermolecule

Ghosh

Bhattacharyya

2005

Int J of Quantum Chemistry

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ABSTRACT:A valence bond description of the electronic structure and the process of the formation of the adduct supermolecule, F 3 B-NH 3 by charge transfer interactions between a Lewis acid, BF 3 , and a Lewis base, NH 3 , is computed in terms of the quantum mechanical localized molecular orbital (LMO) method. A dipole correlation of electronic structure is also reported. The valence bond description in terms of bond pair and lone pair is transparent in the generated LMOs of the donor, acceptor, and adduct supermolecule. It is transparent in the computed LMOs that the lone pair of N in NH 3 is actually involved in forming a new dative bond between B and N atoms. The present work reports the evaluated hybridization status of the boron, nitrogen, and fluorine atoms in the interesting donor-acceptor compound, F 3 B-NH 3 . It is transparent in the computed results that the quantum mechanical hybridization automatically incorporates the effect of change of environment in the pattern of hybridization perfectly in accordance with Bent's rule. The calculated dipole moment of the supermolecule is high; it is partitioned into contributions resulting from bond moments and atomic dipoles, as contributions from hybrid orbitals accommodating lone pairs of electrons. The magnitude of atomic dipole is small compared with the bond dipole component. A rationale of the bond moment of the molecule is attempted in terms of the charge density distribution on atomic sites and the atomic dipole is correlated in terms of the pattern of hybridization of lone pairs on the F atoms. The generated LMOs reveal that only one lone pair on each F atom is in a hybrid orbital, and the remaining two lone pairs are in pure p orbitals. The small lone pair contribution to molecular dipole is thus transparent in computed quantum mechanical hybridization that shows that, out of three, only one lone pair on the F atoms can set in atomic dipole. This study demonstrates that atomic dipole can be used as a descriptor of the hybridization status of lone pairs on atoms in the molecules.

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Wave Modes Trapped in Rotating Nonlinear Potentials

Pang

Malomed

2013

Nonlinear Systems and Complexity

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We study modes trapped in a rotating ring with the local strength of the nonlinearity modulated as cos (2θ), where θ is the azimuthal angle. This modulation pattern may be of three different types: self-focusing (SF), self-defocusing (SDF), and alternating SF-SDF. The model, based on the nonlinear Schrödinger (NLS) equation with periodic boundary conditions, applies to the light propagation in a twisted pipe waveguide, and to a Bose-Einstein condensate (BEC) loaded into a toroidal trap, under the action of the rotating nonlinear pseudopotential induced by means of the Feshbach resonance in an inhomogeneous external field. In the SF, SDF, and alternating regimes, four, three, and five different types of stable trapped modes are identified, respectively: even, odd, second-harmonic (2H), symmetry-breaking, and 2H-breaking ones. The shapes and stability of these modes, together with transitions between them, are investigated in the first rotational Brillouin zone. Ground-state modes are identified in each regime. Boundaries between symmetric and asymmetric modes are also obtained in an analytical form, by of a two-mode approximation.

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Signature of void probability scaling in multipion production at a few GeV∕nucleon

Cited by 18 publications

References 15 publications

Fusion–fission dynamics studies using mass distribution as a probe

Fusion–fission dynamics studies using mass distribution as a probe

Computation of quantum mechanical hybridization and dipole correlation of the electronic structure of the F₃B–NH₃supermolecule

Wave Modes Trapped in Rotating Nonlinear Potentials

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Signature of void probability scaling in multipion production at a few GeV∕nucleon

Cited by 18 publications

References 15 publications

Fusion–fission dynamics studies using mass distribution as a probe

Fusion–fission dynamics studies using mass distribution as a probe

Computation of quantum mechanical hybridization and dipole correlation of the electronic structure of the F3B–NH3supermolecule

Wave Modes Trapped in Rotating Nonlinear Potentials

Contact Info

Product

Resources

About

Computation of quantum mechanical hybridization and dipole correlation of the electronic structure of the F₃B–NH₃supermolecule