Results 1 - 10 of 2827
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[en] We propose a simple experiment to measure the speed of gravity in the laboratory. A moving body induces changes in the gravitational field that travel to the detector with a finite time delay. Moving two bodies causes changes to the gravitational field. These changes can add or subtract, and observing this interference allows for the measurement of the speed of gravity. (author)
[en] Analytical expansions for the radial density function D(r) and expectation values of rsup(n), -2<=n<=5, as calculated within the Hartree-Fock approximation, are reported for a large number of ions of the first 54 elements. (author)
[en] The propagation of weakly nonlinear ion-acoustic waves in an inhomogeneous plasma is studied taking into account the effect of finite ion temperature. It is found that, whereas both the amplitude and the velocity of propagation decrease as the ion-acoustic solitary wave propagates into regions of higher density, the effect of a finite ion temperature is to reduce the amplitude but enhance the velocity of propagation of the solitary wave. (author)
[en] The present paper deals with the interactions of O (16) and Si (28) nuclei with emulsion heavy target nuclei (silver (Ag) and bromine (Br)) at 4.5A GeV/c. The results have been analyzed to identify interesting characteristics of the total disintegration (TD) events produced in these interactions. Events having a number of heavily ionizing particles N(h) ≥ 28 have been selected in this study. The integral multiplicity distributions for the disintegrated particles from the target nuclei have been used to separate the inelastic interactions with the free hydrogen (H), the light (CNO), and the heavy (AgBr) nuclei. The average multiplicities of the different secondary particles emitted in these interactions have been compared with the corresponding ones of different projectiles nearly at the same momentum. The average multiplicity of the grey particles is found to increase with the mass of the projectile, while the average multiplicity of the black particles is found to decrease with increasing mass of the projectile; this result agrees with the prediction of the fireball model. Also, the dependence of the shower, grey, and black particles produced in the (TD) events on the mass of the projectile has been studied. Moreover, the dependence of the probability of the TD for the projectile mass as well as the target fragments has also been discussed. The results show that the multiplicity distributions of the shower, grey, and black particles present a Gaussian distribution. Finally, the linear dependence of the grey and compound multiplicities on the black, heavy, and shower particles has also been observed.
[en] The diffusion constant D for H atoms bound to the surface of liquid sup(4)He is calculated from the Boltzmann equation in the relaxation time approximation. The dominant process for momentum relaxation is found to be the emission and absorption of ripplons. Long wavelength ripplons are shown to couple very weakly to bound H atoms, implying a strong temperature dependence of the relaxation time at low T, (tau) approximately 2 x 10sup(-14)Tsup(-9/2) s for T < 10sup(-3) K. For the experimental temperature range, 0.1 < T < 0.3 K, (tau) is rather long, by which we mean that the mean free path I=anti v(tau) is several thermal De Broglie wavelengths, Λ, i.e. l > 30 Λ for T < 0.3 K. We conclude that surface spin relaxation calculations based on binary collisions of freely propagating H atoms are appropriate for H on liquid sup(4)He and that the hydrodynamic contribution to 1/Tsub(l), due to interactions with ripplons, is negligible