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A general solution of the equations of forced motion of a harmonic crystal or other vibrating system with arbitrary time-dependent forces acting on the atoms is given. The solution is given in terms of dynamical “response functions”, for which expressions in terms of the normal mode frequencies and eigenvectors (polarization vectors) are given. Numerical calculations of the response functions are described for (111) and (100) surfaces of face-centered cubic crystals interacting with Lennard-Jones 6–12 potentials, and the qualitative features of the surface and bulk response functions are discussed. The use of these functions in problems of atomic scattering from surfaces is outline, and conveneint parameterized forms for this application are given. 相似文献
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Z.E. Switkowski J.C.P. Heggie D.L. Kennedy D.G. Sargood F.C. Barker R.H. Spear 《Nuclear Physics A》1979,331(1):50-60
The cross section of the reaction 6Li(p, γ)7Be has been measured using Ge(Li) γ-ray spectrometers for proton bombarding energies Ep from 200 keV to 1200 keV. At Ep = 800 keV, the total (p, γ) integrated cross section is found to be 3.1 ± 0.4 μb. The cross section adopted from consideration of this and previous measurements is in good agreement with that predicted from the known thermal neutron cross section for 6Li(n, γ)7Li on the assumption that properties of mirror direct capture reactions can be well described by optical potentials that use the same parmeter values for the two reactions. 相似文献
36.
Monotone norms and tensor products 总被引:7,自引:0,他引:7
George Phillip Barker 《Linear and Multilinear Algebra》1976,4(3):191-199
Various refinements of orthant monotonicity for norms are studied. A partial order is induced in the tensor product of two partially ordered vector spaces. The induced norm in the tensor product is shown to be orthant monotone in certain cases. 相似文献
37.
The role of the finite, non-zero collision duration in high electric fields is examined for its effect on transient and overshoot response of carrier velocity and energy. A quantum kinetic equation approach is used to develop modifications of the balance equations obtained in a drifted Maxwellian approach for treating high-field transport. These result in corrections which require convolution integrals to be evaluated on the short-time scale. 相似文献
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Blank B Bey A Canchel G Dossat C Fleury A Giovinazzo J Matea I Adimi N De Oliveira F Stefan I Georgiev G Grévy S Thomas JC Borcea C Cortina D Caamano M Stanoiu M Aksouh F Brown BA Barker FC Richter WA 《Physical review letters》2005,94(23):232501
The nucleus 54Zn has been observed for the first time in an experiment at the SISSI/LISE3 facility of GANIL in the quasifragmentation of a 58Ni beam at 74.5 MeV/nucleon in a (nat)Ni target. The fragments were analyzed by means of the ALPHA-LISE3 separator and implanted in a silicon-strip detector where correlations in space and time between implantation and subsequent decay events allowed us to generate almost background free decay spectra for about 25 different nuclei at the same time. Eight 54Zn implantation events were observed. From the correlated decay events, the half-life of 54Zn is determined to be 3.2(+1.8)(-0.8) ms. Seven of the eight implantations are followed by two-proton emission with a decay energy of 1.48(2) MeV. The decay energy and the partial half-life are compared to model predictions and allow for a test of these two-proton decay models. 相似文献