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131.
132.
The problem of scattering from an assembly of non-overlapping spherical potentials is solved in partial-wave basis for each of the constituent potentials. The resulting scattering operator is a quotient of two infinite matrices and depends on “on-shell” partial wave amplitudes of the individual potentials. It suggests in general a truncation scheme which essentially considers only those partial waves effective for each collision at the given energy. The multiple-scattering series is recovered and limiting cases of low energy and high energy are considered. Applications to high-energy scattering of elementary particles on nuclei are briefly discussed. 相似文献
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The elastic scattering in the 3,3 resonance region is discussed in the framework of the nonoverlapping potentials model. Single and double scattering terms are considered together with their modification by reflection terms, which allow the projectile to oscillate back and forth an arbitrary number of times within a pair of nucleons. Reflections and spin and isospin flips are found to constitute a determining factor in a qualitative reproduction of the correct shape of observed angular distributions, in particular for backward scattering angles. Reflections are probably unimportant in πd scattering. 相似文献
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G.M. Rozenblat 《Journal of Applied Mathematics and Mechanics》2011,75(2):176-179
The problem of the motion of a heavy rigid body, supported on a rough horizontal plane at three of its points, is considered. The contacts at the support points are assumed to be unilateral and subject to the law of dry (Coulomb) friction. The dynamics of possible motions of such a body under the action of gravity forces and dry friction is investigated. In the case of a plane body, it is possible to obtain particular integrals of the equations of motion. 相似文献
138.
Huo Q Yuasa T Akatsuka T Takeda T Wu J Thet-Thet-Lwin Hyodo K Dilmanian FA 《Optics letters》2008,33(21):2494-2496
We propose a fluorescent x-ray computed tomography method using an array of detectors with an incident sheet beam, aimed at providing molecular imaging with high sensitivity and good spatial resolution. In this study, we prove the feasibility of this concept and investigate its imaging properties, including spatial and contrast resolutions and quantitativeness, by imaging an acrylic phantom and a normal mouse brain using a preliminary imaging system with monochromatic synchrotron x rays. 相似文献
139.
Spontaneous instabilities of nanoparticles are known to be influenced by the temperature, and strongly depend on the particle
size. However, it is not clear what is the role of the surrounding material that is in contact with the particle. Here we
report on the difference between spontaneous rotations of Bi nanoparticles embedded in amorphous SiO and those embedded in
liquid Ga. The phenomenon was studied quantitatively by time resolved transmission electron microscopy using Fourier Transform
analysis of highresolution electron microscopy images. While rotations of Bi nanoparticles embedded in amorphous SiO occur
by all angles, the rotations of Bi nanoparticles embedded in liquid Ga occur by discrete angles. Our results point quantitatively,
for the first time, to the role and importance of the contacting surrounding surface during the rotation of nanoparticles. 相似文献