{"id":76559,"date":"2005-06-10T00:00:00","date_gmt":"2005-06-10T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/measurement-of-the-u-234nf-cross-section-with-ppac-detectors-at-the-n_tof-facility\/"},"modified":"2005-06-10T00:00:00","modified_gmt":"2005-06-10T00:00:00","slug":"measurement-of-the-u-234nf-cross-section-with-ppac-detectors-at-the-n_tof-facility","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/measurement-of-the-u-234nf-cross-section-with-ppac-detectors-at-the-n_tof-facility\/","title":{"rendered":"Measurement of the u-234(n,f) cross section with ppac detectors at the n_tof facility"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Carlos Paradela Dobarro <\/strong><\/h2>\n<p>La creciente demanda de energ\u00eda ha hecho crecer el inter\u00e9s por  el desarrollo de los reactores nucleares de fisi\u00f3n. Tanto si se pretende mejorar el rendimiento de los reactores actualmente en explotaci\u00f3n (ciclos del u y del th), como si se busca un procedimiento para la trasmutaci\u00f3n de los desechos radiactivos de larga vida media, es necesario disponer de datos m\u00e1s precisos sobre las secciones eficaces de interacci\u00f3n de neutrones sobre los act\u00ednidos menores y los productos de fisi\u00f3n de larga vida media.  los datos actualmente disponibles en las bases de datos nucleares (endf, jendl, &#8230;) Muestran grandes discrepancias y tanto la ocde-nea como la iaea han elaborado una serie de recomendaciones acerca de los datos m\u00e1s relevantes que han de ser medidos dentro de este contexto, entre los que se encuentra el  u-234, que es el principal objetivo de este trabajo de tesis.  el trabajo que se presenta en esta tesis se refiere a las medidas  realizadas dentro de la colaboraci\u00f3n n_tof del cern, con la finalidad de obtener datos precisos sobre las secciones eficaces de fisi\u00f3n de estos is\u00f3topos del uranio, con un haz de neutrones de muy alta  resoluci\u00f3n en energ\u00eda,  en el rango extendido desde 1 ev  hasta  1 gev.  1. Conceptos b\u00e1sicos de la fisi\u00f3n inducida por neutrones  la fisi\u00f3n es un proceso extraordinariamente complejo en el que el  comportamiento colectivo de los componentes de un n\u00faleo fuertemente deformado producen la ruptura nuclear en dos n\u00facleos m\u00e1s ligeros de masas comparables, que llamaremos fragmentos de fisi\u00f3n (ff). Estos ff se producen con unas distribuciones de masas y energ\u00edas cin\u00e9ticas que son dependientes de la energ\u00eda del neutr\u00f3n incidente. Tambi\u00e9n en funci\u00f3n de la energ\u00eda del neutr\u00f3n incidente, se observa una determinada distribuci\u00f3n angular de los ff.  en el cap\u00edtulo 2 de esta memoria se analizan estos conceptos, profundizando \u00fanicamente en aquellos puntos que son relevantes para la interpreta<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Measurement of the u-234(n,f) cross section with ppac detectors at the n_tof facility<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Measurement of the u-234(n,f) cross section with ppac detectors at the n_tof facility <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Carlos Paradela Dobarro <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Santiago de compostela<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 06\/10\/2005<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Ignacio Dur\u00e1n Escribano<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: rui Ferreira marques <\/li>\n<li>roberto Capone noy (vocal)<\/li>\n<li>laurent Tassan-got (vocal)<\/li>\n<li>daniel Cano ott (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Carlos Paradela Dobarro La creciente demanda de energ\u00eda ha hecho crecer el inter\u00e9s por el desarrollo de [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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