Shifts of Ry propagation speed in water kept in different dimension containers

• Autor(a) principal: Leite Neto, Osmar Flávio da Silveira
• Data de Publicação: 2012
• Outros Autores: Cavalcante, José T.P.D., Saitovitch, Henrique, Instituto de Engenharia Nuclear (IEN), Centro Brasileiro de Pesquisas Físicas (CBPF), Fundação Técnico-Educacional Souza Marques
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional do IEN
• Texto Completo: http://carpedien.ien.gov.br:8080/handle/ien/2758
• topic: Propagation speed; 22 Na-isotope; Eletronic coincidence method; Shifts in the fitted coinscidence peaks

The propagation speed (PS) of visible light -a small frequency range in the large frame of electromagnetic radiations (ER)- in air was measured, during the last hundred years(1), using a great deal of different methods, with high precision results being achieved. Further improvements of detection and electronic measuring systems allowed to determine such parameters as PS by using Rγ (2,3,4,5,6,7) order of magnitude values comparable to those measured for visible light- with context, an advantage that such experiments could also measuremed in larger variety of propagation media. In this contextm to compare with our already performed measurements in air, we extended such measurements in water propagation media. But in such case, it may happen that interactions of the propagating Rγ with the water conditioned in vessls with differents diameters, even with same long, could "shift" the PS. As already well settled (2-6,8), to perform such PS measurements the availability of a Rγ source in which two experiment, as far as no reflection techniques could be used. Such suitable source, in all cases, was the positron emitter 22Na placed in a metal container in which the positrons are stopped and annihilated when reacting with the medium electrons, in such way originating -as it is very well established from momentum/energy conservation laws(9)- two Rγ-511 keV each, both emitted simultaneously in opposite directions.