{"id":17396,"date":"2020-06-12T09:31:58","date_gmt":"2020-06-12T09:31:58","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/o-que-e-aniquilacao-de-positron-definicao\/"},"modified":"2020-07-20T06:27:50","modified_gmt":"2020-07-20T06:27:50","slug":"o-que-e-aniquilacao-de-positron-definicao","status":"publish","type":"post","link":"http:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-aniquilacao-de-positron-definicao\/","title":{"rendered":"O que \u00e9 aniquila\u00e7\u00e3o de Positron &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-u-clearfix su-u-trim\">A aniquila\u00e7\u00e3o el\u00e9tron-p\u00f3sitron ocorre quando um el\u00e9tron carregado negativamente e um p\u00f3sitron carregado positivamente colidem. Quando um el\u00e9tron de baixa energia aniquila um p\u00f3sitron de baixa energia.\u00a0Dosimetria de Radia\u00e7\u00e3o<\/div>\n<\/div>\n<div class=\"su-divider su-divider-style-dotted\"><\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<h2>Aniquila\u00e7\u00e3o de Positrons<\/h2>\n<figure id=\"attachment_11717\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-11717\"><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/positron-annihilation.png\"><img loading=\"lazy\" class=\"size-medium wp-image-11717 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/positron-annihilation-300x165.png\" alt=\"aniquila\u00e7\u00e3o de p\u00f3sitrons\" width=\"300\" height=\"165\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/positron-annihilation-300x165.png\" \/><\/a><figcaption id=\"caption-attachment-11717\" class=\"wp-caption-text\">Quando um p\u00f3sitron (part\u00edcula de antimat\u00e9ria) p\u00e1ra, ele interage com um el\u00e9tron, resultando na aniquila\u00e7\u00e3o de ambas as part\u00edculas e na convers\u00e3o completa de sua massa de repouso em energia pura na forma de dois f\u00f3tons de 0,511 MeV direcionados de maneira oposta.<\/figcaption><\/figure>\n<p>A aniquila\u00e7\u00e3o el\u00e9tron-p\u00f3sitron ocorre quando um el\u00e9tron carregado negativamente e um positr\u00e3o carregado positivamente colidem. Quando um el\u00e9tron de baixa energia aniquila um p\u00f3sitron de baixa energia (antipart\u00edcula de el\u00e9tron), ele pode produzir apenas dois ou mais f\u00f3tons (raios gama).\u00a0<strong>\u00c9 proibida a<\/strong>\u00a0produ\u00e7\u00e3o de\u00a0<strong>apenas um f\u00f3ton<\/strong>\u00a0por causa da conserva\u00e7\u00e3o do momento linear e da energia total.\u00a0A produ\u00e7\u00e3o de outra part\u00edcula tamb\u00e9m \u00e9 proibida porque ambas as part\u00edculas (el\u00e9tron-p\u00f3sitron) juntas n\u00e3o carregam energia de massa suficiente para produzir part\u00edculas mais pesadas.\u00a0Quando um el\u00e9tron e um p\u00f3sitron colidem, eles se aniquilam, resultando na convers\u00e3o completa de sua massa em repouso em energia pura (de acordo com a\u00a0\u00a0f\u00f3rmula\u00a0E = mc\u00a0<sup>2<\/sup>\u00a0) na forma de dois raios gama de 0,511 MeV gama dirigidos de maneira oposta (f\u00f3tons).<\/p>\n<p><strong>e\u00a0<sup>&#8211;<\/sup>\u00a0+ e\u00a0<sup>+<\/sup>\u00a0\u2192 \u03b3 + \u03b3 (2x 0,511 MeV)<\/strong><\/p>\n<p>Esse processo deve atender a v\u00e1rias leis de conserva\u00e7\u00e3o, incluindo:<\/p>\n<ul>\n<li>Conserva\u00e7\u00e3o de carga el\u00e9trica.\u00a0A carga l\u00edquida antes e depois \u00e9 zero.<\/li>\n<li>Conserva\u00e7\u00e3o do momento linear e energia total.\u00a0T<\/li>\n<li>Conserva\u00e7\u00e3o do momento angular.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<p>&nbsp;<\/p>\n<p>&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;.<\/p>\n<p>Este artigo \u00e9 baseado na tradu\u00e7\u00e3o autom\u00e1tica do artigo original em ingl\u00eas. Para mais informa\u00e7\u00f5es, consulte o artigo em ingl\u00eas. Voc\u00ea pode nos ajudar. Se voc\u00ea deseja corrigir a tradu\u00e7\u00e3o, envie-a para: translations@nuclear-power.com ou preencha o formul\u00e1rio de tradu\u00e7\u00e3o on-line. Agradecemos sua ajuda, atualizaremos a tradu\u00e7\u00e3o o mais r\u00e1pido poss\u00edvel. Obrigado.<\/p>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights lgc-first\">\n<div class=\"inside-grid-column\"><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>A aniquila\u00e7\u00e3o el\u00e9tron-p\u00f3sitron ocorre quando um el\u00e9tron carregado negativamente e um p\u00f3sitron carregado positivamente colidem. Quando um el\u00e9tron de baixa energia aniquila um p\u00f3sitron de baixa energia.\u00a0Dosimetria de Radia\u00e7\u00e3o Aniquila\u00e7\u00e3o de Positrons Quando um p\u00f3sitron (part\u00edcula de antimat\u00e9ria) p\u00e1ra, ele interage com um el\u00e9tron, resultando na aniquila\u00e7\u00e3o de ambas as part\u00edculas e na convers\u00e3o completa &#8230; <a title=\"O que \u00e9 aniquila\u00e7\u00e3o de Positron &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"http:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-aniquilacao-de-positron-definicao\/\" aria-label=\"More on O que \u00e9 aniquila\u00e7\u00e3o de Positron &#8211; Defini\u00e7\u00e3o\">Ler mais<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[51],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>O que \u00e9 aniquila\u00e7\u00e3o de Positron - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"A aniquila\u00e7\u00e3o el\u00e9tron-p\u00f3sitron ocorre quando um el\u00e9tron carregado negativamente e um p\u00f3sitron carregado positivamente colidem. 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