W. Scheid

Search of systematic behavior of breakup probability in reactions with weakly bound projectiles at energies around Coulomb barrier

V. V. Sargsyan, G. G. Adamian, N. V. Antonenko +2

Comparing the capture cross sections calculated without the breakup effect and experimental complete fusion cross sections, the breakup was analyzed in reactions with weakly bound…

Quasifission at extreme sub-barrier energies

V. V. Sargsyan, G. G. Adamian, N. V. Antonenko +2

With the quantum diffusion approach the behavior of the capture cross-section is investigated in the reactions $^{92, 94}$ Mo + $^{92, 94}$ Mo, $^{100}$ Ru + $^{100}$ Ru, $^{104}$ Pd + $^…

Quantum decoherence and classical correlations of the harmonic oscillator in the Lindblad theory

A. Isar, W. Scheid

In the framework of the Lindblad theory for open quantum systems we determine the degree of quantum decoherence and classical correlations of a harmonic oscillator interacting with…

nucl-th2004

1S0 Proton and Neutron Superfluidity in beta-stable Neutron Star Matter

W. Zuo, Z. H. Li, G. C. Lu +5

We investigate the effect of a microscopic three-body force on the proton and neutron superfluidity in the $^{1} S_{0}$ channel in $I^^{2}$ -stable neutron star matter. It is found that the…

nucl-th2010

Multiple reflection-asymmetric type band structures in $^{220} T h$ and dinuclear model

T. M. Shneidman, G. G. Adamian, N. V. Antonenko +2

The negative parity bands in $^{220}$ Th are analyzed within the dinuclear system model which was previously used for describing the alternating-parity bands in deformed actinides.…

nucl-th2001

Breakup of $^{9}$ Be on $^{209}$ Bi above and near the Coulomb barrier as a molecular single-particle effect: its influence on complete fusion and scattering

A. Diaz-Torres, I. J. Thompson, W. Scheid

The breakup of the $^{9}$ Be projectile on the $^{209}$ Bi target at bombarding energies above and near the Coulomb barrier is studied in the adiabatic two-center shell model approac…

Collinear cluster tripartition as sequential binary fission in the $^{235}$ U(n $_{th}$ ,f) reaction

R. B. Tashkhodjaev, A. K. Nasirov, W. Scheid

The mechanism leading to the formation of the observed products of the collinear cluster tripartition is carried out within the framework of the model based on the dinuclear system…

quant-ph2004

Open quantum systems

A. Isar, A. Sandulescu, H. Scutaru +2

The damping of the harmonic oscillator is studied in the framework of the Lindblad theory for open quantum systems. A generalization of the fundamental constraints on quantum mecha…

Sub-barrier capture reactions with $^{16, 18}$ O and $^{40, 48}$ Ca beams

V. V. Sargsyan, G. G. Adamian, N. V. Antonenko +2

Various sub-barrier capture reactions with beams $^{16, 18}$ O and $^{40, 48}$ Ca are treated within the quantum diffusion approach. The role of neutron transfer in these capture react…

math-ph1999

An approximate method for solving inverse scattering problem with fixed-energy phase shifts

A. G. Ramm, W. Scheid

An approximate method is proposed for the recovery of a compactly supported spherically-symmetric potential from the set of fixed-energy phase-shifts known for all angular momenta.…

Dynamics of dinuclear system formation and its decay in heavy ion collisions

A. K. Nasirov, G. Giardina, G. Mandaglio +2

A variety of phenomena connected with the formation of a dinuclear complex is observed in the heavy ion collisions at low energies. The dinuclear system model allows us to analyze…

quant-ph1996

Phase Space Representation for Open Quantum Systems within the Lindblad Theory

A. Isar, A. Sandulescu, W. Scheid

The Lindblad master equation for an open quantum system with a Hamiltonian containing an arbitrary potential is written as an equation for the Wigner distribution function in the p…

Lindblad master equation for the damped harmonic oscillator with deformed dissipation

A. Isar, A. Sandulescu, W. Scheid

In the framework of the Lindblad theory for open quantum systems, a master equation for the quantum harmonic oscillator interacting with a dissipative environment, in particular wi…

Dissipative tunneling through a parabolic potential in the Lindblad theory of open quantum systems

A. Isar, A. Sandulescu, W. Scheid

By using the Lindblad theory for open quantum systems, an analytical expression of the tunneling probability through an inverted parabola is obtained. This penetration probability…

Sub-barrier capture with quantum diffusion approach

V. V. Sargsyan, R. A. Kuzyakin, G. G. Adamian +3

With the quantum diffusion approach the behavior of capture cross sections and mean-square angular momenta of captured systems are revealed in the reactions with deformed and spher…

Triple coalescence singularity in a dynamical atomic process

E. G. Drukarev, A. I. Mikhailov, I. A. Mikhailov +1

We show that the high energy limit for the amplitude of the double electron capture to the bound state of the Coulomb field of a nucleus with emission of a single photon is determi…

Melting or nucleon transfer in fusion of heavy nuclei?

A. Diaz-Torres, G. G. Adamian, N. V. Antonenko +1

The time-dependent transition between a diabatic interaction potential in the entrance channel and an adiabatic potential during the fusion process is investigated within the two-c…

Dynamical restriction for a growing neck due to mass parameters in a dinuclear system

G. G. Adamian, N. V. Antonenko, A. Diaz-Torres +1

Mass parameters for collective variables of a dinuclear system and strongly deformed mononucleus are microscopically formulated with the linear response theory making use of the wi…

Sub-barrier capture with quantum diffusion approach: actinide-based reactions

V. V. Sargsyan, G. G. Adamian, N. V. Antonenko +2

With the quantum diffusion approach the behavior of capture cross sections and mean-square angular momenta of captured systems are revealed in the reactions with deformed nuclei at…

cond-mat1997

Tunneling with dissipation in open quantum systems

G. G. Adamian, N. V. Antonenko, W. Scheid

Based on the general form of the master equation for open quantum systems the tunneling is considered. Using the path integral technique a simple closed form expression for the tun…

math-ph2001

Inverse Scattering by the Stability Index Method

S. Gutman, A. G. Ramm, W. Scheid

A novel numerical method for solving inverse scattering problem with fixed-energy data is proposed. The method contains a new important concept: the stability index of the inversio…

The formation and decay of superheavy nuclei produced in $^{48} C a$ -induced reactions

Sushil Kumar, M. Balasubramaniam, Raj K. Gupta +2

The formation of superheavy nuclei in $^{48} C a +^{232} T h$ , $^{238} U$ , $^{242, 244} P u$ and $^{248} C m$ reactions and their subsequent decay are studied within the quantum mechanical fr…

quant-ph2006

Purity and decoherence in the theory of a damped harmonic oscillator

A. Isar, A. Sandulescu, W. Scheid

For the generalized master equations derived by Karrlein and Grabert for the microscopic model of a damped harmonic oscillator, the conditions for purity of states are written, in…

nucl-th2014

Why does neutron transfer play different roles in sub-barrier fusion reactions $^{32}$ S+ $^{94, 96}$ Zr and $^{40}$ Ca+ $^{94, 96}$ Zr?

V. V. Sargsyan, G. G. Adamian, N. V. Antonenko +2

The sub-barrier capture (fusion) reactions $^{32}$ S+ $^{90, 94, 96}$ Zr, $^{36}$ S+ $^{90, 96}$ Zr, $^{40}$ Ca+ $^{90, 94, 96}$ Zr, and $^{48}$ Ca+ $^{90, 96}$ Zr with positive and negative $Q$ -val…

q-alg1996

Complex su_q(2) Dynamical Symmetry, Limiting Cases and 1-Dimensional Potential Realisation

A. Ludu, W. Scheid

Using a complex deformation q=exp(is) of su(2) we obtain extensions of the finite-dimensional representations towards the infinite-dimensional ones. A generalised q-deformation of…

cond-mat1999

Effect of transport coefficients on the time-dependence of density matrix

Yu. V. Palchikov, G. G. Adamian, N. V. Antonenko +1

For Lindblad's master equation of open quantum systems with a general quadratic form of the Hamiltonian, the propagator of the density matrix is analytically calculated by using pa…

Effects of nuclear deformation and neutron transfer in capture process, and origin of fusion hindrance at deep sub-barrier energies

V. V. Sargsyan, G. G. Adamian, N. V. Antonenko +2

The roles of nuclear deformation and neutron transfer in sub-barrier capture process are studied within the quantum diffusion approach. The change of the deformations of colliding…

nucl-th2004

Alpha particle production by molecular single-particle effect in reactions of $^{9}$ Be just above the Coulomb barrier

A. Diaz-Torres, I. J. Thompson, W. Scheid

The $I^\pm$ -particle production in the dissociation of $^{9}$ Be on $^{209}$ Bi and $^{64}$ Zn at energies just above the Coulomb barrier is studied within the two-center shell model app…

nucl-th2016

Application of the triaxial quadrupole-octupole rotor to the ground and negative-parity levels of actinide nuclei

M. S. Nadirbekov, N. Minkov, M. Strecker +1

In this work we examine the possibility to describe yrast positive- and negative-parity excitations of deformed even-even nuclei through a collective rotation model in which the nu…

Sub-barrier capture reactions with $^{16, 18}$ O beams

V. V. Sargsyan, G. G. Adamian, N. V. Antonenko +2

Various sub-barrier capture reactions with beams $^{16, 18}$ O are treated within the quantum diffusion approach. The role of neutron transfer in these capture reactions is discussed…

Non-yrast nuclear spectra in a model of coherent quadrupole-octupole motion

N. Minkov, S. Drenska, M. Strecker +2

A model assuming coherent quadrupole-octupole vibrations and rotations is applied to describe non-yrast energy sequences with alternating parity in several even-even nuclei from di…

Deformed quantum harmonic oscillator with diffusion and dissipation

A. Isar, W. Scheid

A master equation for the deformed quantum harmonic oscillator interacting with a dissipative environment, in particular with a thermal bath, is derived in the microscopic model by…

Uncertainty functions of the open quantum harmonic oscillator in the Lindblad theory

A. Isar, W. Scheid

In the framework of the Lindblad theory for open quantum systems, we derive closed analytical expressions of the Heisenberg and SchrÃ¶dinger generalized uncertainty functions for a…

Deformation of quantum oscillator and of its interaction with environment

A. Isar, W. Scheid

A master equation for the deformed quantum harmonic oscillator interacting with a dissipative environment, in particular with a thermal bath, is derived in the microscopic model by…

Structure effects in the region of superheavy elements via the $I^\pm$ -decay chain of $^{293}$ 118

Raj K. Gupta, Sushil Kumar, Rajesh Kumar +2

The $I^\pm$ -decay chain of $^{293}$ 118, first proposed in the Berkeley cold fusion experiment $^{208}$ Pb( $^{86}$ Kr,1n) and now retracted, is calculated by using the preformed cluster…

Isotopic dependence of fusion cross sections in reactions with heavy nuclei

G. G. Adamian, N. V. Antonenko, W. Scheid

The dependence of fusion cross section on the isotopic composition of colliding nuclei is analysed within the dinuclear system concept for compound nucleus formation. Probabilities…

nucl-th2008

Quasifission and fusion-fission in massive nuclei reactions. Comparison of reactions leading to the Z=120 element

A. K. Nasirov, G. Giardina, F. Hanappe +6

The yields of evaporation residues, fusion-fission and quasifission fragments in the $^{48}$ Ca+ $^{144, 154}$ Sm and $^{16}$ O+ $^{186}$ W reactions are analyzed in the framework of the…

nucl-th2000

Collective Modes of Tri-Nuclear Molecules

P. O. Hess, S. Misicu, W. Greiner +1

A geometrical model for tri-nuclear molecules is presented. An analytical solution is obtained provided the nuclei, which are taken to be prolately deformed, are connected in line…

Correlation between muonic levels and nuclear structure in muonic atoms

J. M. Dong, W. Zuo, H. F. Zhang +3

A method that deals with the nucleons and the muon unitedly is employed to investigate the muonic lead, with which the correlation between the muon and nucleus can be studied disti…

nucl-th1997

Treatment of competition between complete fusion and quasifission in collisions of heavy nuclei

G. G. Adamian, N. V. Antonenko, W. Scheid +1

A model of competition between complete fusion and quasifission channels in fusion of two massive nuclei is extended to include the influence of dissipative effects on the dynamics…

Dinuclear concept - cluster model of fusion

G. G. Adamian, N. V. Antonenko, E. A. Cherepanov +3

The synthesis of superheavy elements is analysed within the dinuclear system concept of compound nucleus formation. The perspectives for using radioactive beams in complete fusion…

Threshold energy for sub-barrier fusion hindrance phenomenon

V. V. Sargsyan, G. G. Adamian, N. V. Antonenko +2

The relationship between the threshold energy for a deep sub-barrier fusion hindrance phenomenon and the energy at which the regime of interaction changes (the turning-off of the n…

nucl-th2010

Peculiarities of sub-barrier fusion with quantum diffusion approach

V. V. Sargsyan, G. G. Adamian, N. V. Antonenko +1

With the quantum diffusion approach the unexpected behavior of fusion cross section, angular momentum, and astrophysical S-factor at sub-barrier energies has been revealed. Out of…

Non-yrast spectra of odd-A nuclei in a model of coherent quadrupole-octupole motion

N. Minkov, S. Drenska, K. Drumev +3

The model of coherent quadrupole and octupole motion (CQOM) is applied to describe non-yrast split parity-doublet spectra in odd-mass nuclei. The yrast levels are described as low-…

Relationship between dinuclear systems and nuclei in highly deformed states

T. M. Shneidman, G. G. Adamian, N. V. Antonenko +2

Potential energies, moments of inertia, quadrupole and octupole moments of dinuclear systems are compared with the corresponding quantities of strongly deformed nuclei. As dinuclea…

quant-ph2006

Formation of ions by high energy photons

E. G. Drukarev, A. I. Mikhailov, I. A. Mikhailov +2

We calculate the electron energy spectrum of ionization by a high energy photon, accompanied by creation of electron-positron pair. The total cross section of the process is also o…

Derivation of breakup probabilities from experimental elastic backscattering data

V. V. Sargsyan, G. G. Adamian, N. V. Antonenko +2

We suggest simple and useful method to extract breakup probabilities from the experimental elastic backscattering probabilities in the reactions with toughly and weakly bound nucle…