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91.
P. Pawłowski B. Borderie G. Auger Ch.O. Bacri N. Bellaize F. Bocage R. Bougault R. Brou P. Buchet J.L. Charvet A. Chbihi J. Colin D. Cussol R. Dayras A. Demeyer D. Doré D. Durand J.D. Frankland E. Galichet E. Genouin-Duhamel E. Gerlic D. Guinet P. Lautesse J.L. Laville J.F. Lecolley R. Legrain N. Le Neindre O. Lopez M. Louvel A.M. Maskay L. Nalpas A.D. Nguyen M. Pârlog J. Péter E. Plagnol M.F. Rivet E. Rosato F. Saint-Laurent S. Salou J.C. Steckmeyer M. Stern G. Tăbăcaru B. Tamain L. Tassan-Got O. Tirel E. Vient C. Volant J.P. Wieleczko 《The European Physical Journal A - Hadrons and Nuclei》2000,9(3):371-383
The prompt component at intermediate velocity of light charged particles is investigated. An improved coalescence model coupled
to the intra-nuclear cascade code ISABEL is used to obtain light complex particle energy spectra and multiplicities as a function
of impact parameter. The results are compared with experimental data from the 36Ar + 58Ni experiment at 95 MeV/nucleon, performed with the INDRA 4π detection system. The calculated prompt component is found to
rather well reproduce proton spectra. For complex light charged particles the calculated components well populate the high
energy part of spectra. Prompt emission can therefore explain the large transverse energies experimentally observed at mid-rapidity.
Received: 27 July 2000 / Accepted: 20 November 2000 相似文献
92.
The interplay of diffraction dissociation and nuclear shakeoff is considered in a schematic but still realistic model for
the case of the break-up of halo nuclei on light targets. We demonstrate that the shakeoff effect, arising from the momentum
imparted by the core diffraction, is small but still identifiable in the experimental data for the dissociation of the one-
and two-neutron halo nuclei 11Be and 11Li.
Received: 29 October 1999 / Revised version: 15 January 2000 相似文献
93.
M. Ibañes J. García-Ojalvo R. Toral J.M. Sancho 《The European Physical Journal B - Condensed Matter and Complex Systems》2000,18(4):663-673
The domain growth processes originating from noise-induced nonequilibrium phase transitions are analyzed, both for non-conserved
and conserved dynamics. The existence of a dynamical scaling regime is established in the two cases, and the corresponding
growth laws are determined. The resulting universal dynamical scaling scenarios are those of Allen-Cahn and Lifshitz-Slyozov,
respectively. Additionally, the effect of noise sources on the behaviour of the pair correlation function at short distances
is studied.
Received 28 June 2000 and Received in final form 29 September 2000 相似文献
94.
M. Hengsberger P. Segovia M. Garnier D. Purdie Y. Baer 《The European Physical Journal B - Condensed Matter and Complex Systems》2000,17(4):603-608
We present high-resolution photoemission data from the Bi(111)-surface. The electronic structure of the semimetal close to
the Fermi level has been found to change dramatically with respect to the well established bulk band structure. The Fermi
surfaces observed for the electron and hole bands resemble those of the next group-V element, antimony, probably as a consequence
of surface relaxation. This results in a relatively high surface charge density. The observed temperature dependence of the
electron Fermi energy confirms this result.
Received 8 June 2000 相似文献
95.
K. Boukheddaden J. Linares H. Spiering F. Varret 《The European Physical Journal B - Condensed Matter and Complex Systems》2000,15(2):317-326
We investigate the dynamical properties of the 1-D Ising-like Hamiltonian taking into account short and long range interactions,
in order to predict the static and dynamic behavior of spin crossover systems. The stochastic treatment is carried out within
the frame of the local equilibrium method [1]. The calculations yield, at thermodynamic equilibrium, the exact analytic expression
previously obtained by the transfer matrix technique [2]. We mainly discuss the shape of the relaxation curves: (i) for large
(positive) values of the short range interaction parameter, a saturation of the relaxation curves is observed, reminiscent
of the behavior of the width of the static hysteresis loop [3]; (ii) a sigmoidal (self-accelerated) behavior is obtained for
large enough interactions of any type; (iii) the relaxation curves exhibit a sizeable tail (with respect to the mean-field
curves) which is clearly associated with the transient onset of first-neighbor correlations in the system, due to the effect
of short-range interactions. The case of negative short-range interaction is briefly discussed in terms of two-step properties.
Received 29 October 1999 and Received in final form 30 December 1999 相似文献
96.
A. Hazareesing J.-P. Bouchaud 《The European Physical Journal B - Condensed Matter and Complex Systems》2000,14(4):713-724
We reconsider the problem of the static thermal roughening of an elastic manifold at the critical dimension d=2 in a periodic potential, using a perturbative Functional Renormalization Group approach. Our aim is to describe the effective
potential seen by the manifold below the roughening temperature on large length scales. We obtain analytically a flow equation
for the potential and surface tension of the manifold, valid for low temperatures. On a length scale L, the renormalized potential is made up of a succession of quasi parabolic wells, matching onto one another in a singular
region of width for large L. For strong periodic potential, the perturbation theory breaks down, and we argue, based on a variational calculation, that
the transition becomes first order. We also obtain numerically the step energy as a function of temperature, and relate our
results to the existing experimental data on 4He. Finally, we examine the case of a non local elasticity which is realized physically for the contact line.
Received 16 April 1999 and Received in final form 11 October 1999 相似文献
97.
E. Zerrad Y. Hahn 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2000,10(1):81-97
The conventional Hartree and Hartree-Fock approaches for treating many-electron bound systems have been extended recently
to positive energy scattering problems, in which both the bound and continuum orbitals are determined by the requirement of
full self-consistency. Serious consequences of such a theory are that the target orbitals become energy dependent and the
asymptotic boundary conditions are satisfied only approximately, in lowest order. It is important therefore to test the theory
for its convergence under configuration mixing. This self-consistent field (SCF) theory for scattering has been tested here
for scattering from hydrogenic target as a model where the target function is determined dynamically. Penetration of the projectile
inside the bound target orbital is manifest through the SCF for the bound state. Our results show that the theory converges
to the correct amplitudes and to the exact boundary conditions as more configurations are added. The use of the amputated
functions and the weak asymptotic condition (WAC) upon which the SCF theory is based, is justified as the WAC converges to
the correct limit. It is then applied to the positron-helium and electron-helium scattering systems where the helium function
is calculated simultaneously together with the scattering function. The resulting phase shifts and the SCF target functions
are compared with those obtained with the pre-determined target functions in the conventional approaches.
Received 22 September 1999 相似文献
98.
H.X. Yang 《Solid State Communications》2007,142(12):718-722
The ground state of Na0.5CoO2 has been calculated using the full potential local orbital method and local density approximation plus Hubbard U (); the results demonstrate that charge and orbital ordering evidently exist in the present system in association with the antiferromagnetic state. Notable structural features observed between 300 and 30 K have been carefully examined using in situ TEM investigations, a superstructure with a wave vector of Q1=a∗/2, becoming commonly visible below , can be interpreted as the charge/orbital ordering on the Co1 and Co2 sites. Moreover, we have also observed another notable superstructure with Q2=a∗/4 below the phase transition of , which suggests a more complicated orbital ordered state existing at lower temperatures. 相似文献
99.
The growing curve of light-induced dangling bonds under illumination has been observed for various intensities of illumination in a-Si:H. It is fitted to a stretched exponential function and then two parameters β and τ involved in the function are estimated as a function of saturated dangling bond density . The experimental values of β, τ, and are compared with those calculated based on our model of light-induced defect creation in a-Si:H. 相似文献
100.