{"id":3605,"date":"2013-09-15T03:01:46","date_gmt":"2013-09-15T01:01:46","guid":{"rendered":"http:\/\/www.ilkkimbuldu.com\/?p=3605"},"modified":"2016-12-25T13:49:47","modified_gmt":"2016-12-25T11:49:47","slug":"pozitronu-kim-buldu","status":"publish","type":"post","link":"https:\/\/www.ilkkimbuldu.com\/?p=3605","title":{"rendered":"Pozitron&#8217;u kim buldu"},"content":{"rendered":"<p>Pozitron elektronun k\u00fctlesi kadar k\u00fctleye s\u00e2hip, fakat\u00a0pozitif elektrik y\u00fck\u00fc ta\u015f\u0131yan elemanter tanecik. <b>Pozitron<\/b>, elektronun kar\u015f\u0131 par\u00e7ac\u0131\u011f\u0131 olan art\u0131 y\u00fckl\u00fc leptondur. Bu taneci\u011fin mevcudiyeti ilk def\u00e2 \u0130ngiliz fizik\u00e7isi <strong>Dirac\u00a0<\/strong>taraf\u0131ndan teklif edilmi\u015f; ancak Amerikal\u0131 fizik\u00e7i <strong>Anderson<\/strong> 1932\u2019de pozitronlar\u0131n kozmik \u0131\u015f\u0131nlar\u00a0i\u00e7erisinde bulundu\u011funu tespit etmi\u015ftir.<\/p>\n<p>Antipar\u00e7ac\u0131k kavram\u0131n\u0131n ilk \u00f6rne\u011fi &#8220;pozitrondur&#8221;. Pozitronun varl\u0131\u011f\u0131 deneysel olarak kan\u0131tlanmadan \u00f6nce bir hipotez olarak ortaya at\u0131lm\u0131\u015ft\u0131. 1928&#8217;de \u0130ngiliz fizik\u00e7isi Paul Dirac, Schr\u00f6dinger denklemini geni\u015fletti. Dirac&#8217;\u0131n amac\u0131 Schr\u00f6dinger denkleminin g\u00f6relilik teorisiyle uyumlu hale getirmekti ama daha fazlas\u0131n\u0131 elde etti.Dirac&#8217;\u0131n denklemi spin kuantum say\u0131s\u0131n\u0131 s=1\/2 olarak veriyordu ve b\u00f6ylece elektron spini \u00f6ng\u00f6r\u00fclm\u00fc\u015f oluyordu.<\/p>\n<p>Dirac denklemi elektrona uyguland\u0131\u011f\u0131nda, y\u00fck\u00fc +e olan ikinci bir par\u00e7ac\u0131\u011f\u0131n da ayn\u0131 denklemi sa\u011flayaca\u011f\u0131 g\u00f6r\u00fcld\u00fc.Y\u00fck\u00fc pozitif olarak bilinen tek par\u00e7ac\u0131k proton oldu\u011fundan, Dirac \u00f6nce yazd\u0131\u011f\u0131 denklemin protonuda kapsad\u0131\u011f\u0131n\u0131 zannetti. Fakat k\u0131sa s\u00fcrede,+e y\u00fckl\u00fc bu par\u00e7ac\u0131\u011f\u0131n elektronla ayn\u0131 k\u00fctleli ve ayn\u0131 spinli olmas\u0131 gerekti\u011fi anla\u015f\u0131ld\u0131. Bug\u00fcn bu par\u00e7ac\u0131\u011f\u0131n &#8220;pozitron&#8221; oldu\u011funu biliyoruz. (<i>pozitif elektron<\/i> da denir), 1932 y\u0131l\u0131nda ABD&#8217;li fizik\u00e7i Carl David Anderson taraf\u0131ndan kozmik \u0131\u015f\u0131nlarla g\u00f6zlenmi\u015f ve ke\u015ffedilmi\u015ftir.<\/p>\n<p>Pozitronlar serbest h\u00e2lde atomlar i\u00e7inde bulunmazlar. Ortalama\u00a0\u00f6m\u00fcrleri \u00e7ok k\u0131sad\u0131r. Bu y\u00fczden t\u00e2kibi \u00e7ok zordur. Pozitronlar\u0131n meydana gelmesi bir fotonun maddeye\u00a0d\u00f6n\u00fc\u015fmesi neticesi olur. Aksi durumda, y\u00e2ni maddeden fotona ge\u00e7i\u015f esn\u00e2s\u0131nda yok olurlar.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pozitron elektronun k\u00fctlesi kadar k\u00fctleye s\u00e2hip, fakat\u00a0pozitif elektrik y\u00fck\u00fc ta\u015f\u0131yan elemanter tanecik. Pozitron, elektronun kar\u015f\u0131 par\u00e7ac\u0131\u011f\u0131 olan art\u0131 y\u00fckl\u00fc leptondur. Bu taneci\u011fin mevcudiyeti ilk def\u00e2 \u0130ngiliz fizik\u00e7isi Dirac\u00a0taraf\u0131ndan teklif edilmi\u015f;&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[92],"tags":[2708,2707,2218],"class_list":["post-3605","post","type-post","status-publish","format-standard","hentry","category-bilim","tag-carl-david-anderson","tag-paul-dirac","tag-pozitron"],"_links":{"self":[{"href":"https:\/\/www.ilkkimbuldu.com\/index.php?rest_route=\/wp\/v2\/posts\/3605"}],"collection":[{"href":"https:\/\/www.ilkkimbuldu.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ilkkimbuldu.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ilkkimbuldu.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ilkkimbuldu.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3605"}],"version-history":[{"count":4,"href":"https:\/\/www.ilkkimbuldu.com\/index.php?rest_route=\/wp\/v2\/posts\/3605\/revisions"}],"predecessor-version":[{"id":6553,"href":"https:\/\/www.ilkkimbuldu.com\/index.php?rest_route=\/wp\/v2\/posts\/3605\/revisions\/6553"}],"wp:attachment":[{"href":"https:\/\/www.ilkkimbuldu.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3605"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ilkkimbuldu.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3605"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ilkkimbuldu.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3605"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}