摘要:

Two independent measurements of cross sections for the19F+93Nbstrongly dissipative heavy-ion collisions have been performed at incident energies from 102 to 108 MeV in steps of 250 keV. In the two measurements we used different, independently prepared,93Nbtarget foils with the thickness ≃70 &mgr;g/cm2. All other experimental conditions were identical in both experiments. The data indicate non-reproducibility of the non-self-averaging oscillating yields in the two measurements. This supports recent theoretical predictions of spontaneous coherence, slow phase randomization and extreme sensitivity in highly-excited complex quantum systems. ©2001 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1427482

出版商:AIP    

年代:1901

数据来源: AIP

摘要:

The resonant periodic trajectories in time-dependent Hartree-Fock phase space are found to be bifurcated from simple vibrational trajectories in a three-level model Hamiltonian. Corresponding to the bifurcated periodic trajectories, there are series of resonant eigenstates with characteristic profile function shapes. In terms of resonant basis system, it is pointed out that the quantum mechanical resonance overlap mechanism determines the stability of the eigenstates. ©2001 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1427483

出版商:AIP    

年代:1901

数据来源: AIP

摘要:

The chaotic properties for six particles interacting by delta force in a two-j model coupled with a deformed core are studied by replacing the scalar rotation energy of particles-rotor model by a one-body cranking term. The nearest-neighbor distribution of energy levels and spectral rigidity are studied as the function of the spin or cranking frequency, respectively. The results of single-j shell are compared with those in two-j case. The system becomes more regular when single-j(i13/2)space is replaced by two-j(g7/2+d5/2)shell although the basis size of the configuration space is unchanged. However, the degree of chaoticity of the system changes slightly when configuration space is enlarged by extending single-j(i13/2)shell to two-j(i13/2+g9/2)shell. ©2001 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1427484

出版商:AIP    

年代:1901

数据来源: AIP

摘要:

Based on the energy levels of the odd-odd nucleus84Yat low spins calculated by using two quasi-particles plus rotor model and the distribution of the nearest-neighbor spacing (NNS) and the spectral rigidity (SR)&Dgr;3got from random matrix theory (RMT), the effect of quasi-particle treatment upon spectra statistics are studied. We find that the quasi-particle characteristic makes the energy spectra statistics tends to chaotic and the chaos of the spectra mainly comes from the common action of the quasiparticles in the Coriolis and recoil terms of the collective Hamiltonian. ©2001 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1427485

出版商:AIP    

年代:1901

数据来源: AIP

摘要:

We have systematically studied the characteristic features of nonequilibrium transport processes for a microscopic Hamilton system with finite degrees of freedom without introducing any statistical ansatz. It is found that the dissipation of collective motion nonlinearly coupled with the finite intrinsic system is realized through the dephasing, the statistical relaxation and the equilibrium stages. Dominant stage changes depending on the number of intrinsic degrees of freedom. It turns out that the statistical relaxation in the finite system is the anomalous diffusion and the fluctuation effects have finite correlation time. ©2001 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1427486

出版商:AIP    

年代:1901

数据来源: AIP

摘要:

We introduce the discrete variational principle in the framework of multi-parameter differential approach by regarding the forward difference as an entire geometric object. By virtue of this variational principle, we get the difference discrete Euler-Lagrange equations for the difference discrete classical mechanics and classical field theory. We also explore the difference discrete versions for the Euler-Lagrange cohomology and apply to the symplectic or multisymplectic geometry and preserving property in discrete mechanics and field theory. In terms of the difference discrete Euler-Lagrange cohomological concepts, we show that the symplectic or multisymplectic geometry and their difference discrete structure preserving properties can always be established not only in the solution spaces of the discrete Euler-Lagrange equations but also in the function space in each case if and only if the relevant closed Euler-Lagrange cohomological conditions are satisfied. ©2001 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1427487

出版商:AIP    

年代:1901

数据来源: AIP

摘要:

We apply the concept of factorial moments (FM) to the analysis of long range co-relations in several kinds of series, such as DNA sequence, heartbeat interval time series, and gait time series. It is found that FM is effective to describe the dynamical fluctuations embedded in these series. ©2001 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1427488

出版商:AIP    

年代:1901

数据来源: AIP

摘要:

We will show that 2-dimensionalN=2-extended supersymmetric theory has solitonic solution using the Hamilton-Jacobi method of classical mechanics. Then it is shown that the Bogomol’nyi mass bound is saturated by these solutions and triangular mass inequality is satisfied. At the end, we will mention domain-wall structure in 3-dimensional spacetime. ©2001 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1427489

出版商:AIP    

年代:1901

数据来源: AIP

摘要:

Within the new framework of &agr;-cluster wave function which is of the &agr;-particle condensate type, we study12Cand16O.The results show that states of low density close to the &agr;-particle threshold in both nuclei are possibly of this kind. It is conjectured that all self-conjugate4nnuclei may show similar features. ©2001 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1427490

出版商:AIP    

年代:1901

数据来源: AIP

摘要:

©2001 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1427491

出版商:AIP    

年代:1901

数据来源: AIP