Existence Of Radiation Research Articles

Gravitational Radiation

In this paper, we investigate the existence of gravitational radiation within the framework of the EIH approximation method. Following a prescription introduced by Infeld, the radiation terms of the EIH expansion are begun with functions of the time alone. We find that these terms do not have physical significance if they are introduced in the scalar or longitudinal components of the gravitational potentials. However, if the radiation terms are introduced in the fifth order of the transverse-transverse components, one finds a contribution to the curvature tensor in the seventh order, a contribution to the equations of motion in the ninth order, and radiation in the tenth order. The existence of radiation is determined by calculating the energy passing through a spherical surface which is an infinite distance from all source points. This definition of radiation agrees with that used in the theory of electromagnetism.

Disintegration of Lithium by Swift Protons

IN a previous letter to this journal1 we have described a method of producing a steady stream of swift protons of energies up to 600 kilovolts by the application of high potentials, and have described experiments to measure the range of travel of these protons outside the tube. We have employed the same method to examine the effect of the bombardment of a layer of lithium by a stream of these ions, the lithium being placed inside the tube at 45° to the beam. A mica window of stopping power of 2 cm. of air was sealed on to the side of the tube, and the existence of radiation from the lithium was investigated by the scintillation method outside the tube. The thickness of the mica window was much more than sufficient to prevent any scattered protons from escaping into the air even at the highest voltages used.