{"id":11821,"date":"2022-07-11T10:55:06","date_gmt":"2022-07-11T08:55:06","guid":{"rendered":"http:\/\/localhost:8888\/igfae-ber\/?p=11821"},"modified":"2024-04-12T14:23:31","modified_gmt":"2024-04-12T12:23:31","slug":"as-investigadoras-do-igfae-dolores-cortina-e-beatriz-fernandez-articipan-no-descubrimento-dun-novo-estado-exotico-da-materia-o-tetraneutron","status":"publish","type":"post","link":"https:\/\/igfae.usc.es\/igfae\/as-investigadoras-do-igfae-dolores-cortina-e-beatriz-fernandez-articipan-no-descubrimento-dun-novo-estado-exotico-da-materia-o-tetraneutron\/","title":{"rendered":"As investigadoras do IGFAE Dolores Cortina e Beatriz Fern\u00e1ndez participan no descubrimento dun novo estado ex\u00f3tico da materia: o tetraneutr\u00f3n"},"content":{"rendered":"<p><strong>O resultado publicouse na revista Nature e sup\u00f3n a primeira observaci\u00f3n compatible cun sistema da materia formado exclusivamente por neutr\u00f3ns. Este achado, clave para entender como funciona a forza nuclear, foi presentado en exclusiva no congreso DREB2022, organizado polo Instituto Galego de F\u00edsica de Altas Enerx\u00edas a semana pasada en Santiago de Compostela<\/strong><\/p>\n<p>Unha das procuras continuas desde fai seis d\u00e9cadas en f\u00edsica nuclear foi saber se poden existir sistemas case-ligados formados unicamente por neutr\u00f3ns.\u00a0 Para manter un n\u00facleo ligado, a materia visible necesita de prot\u00f3ns e neutr\u00f3ns. Excepto as estrelas de neutr\u00f3ns, que est\u00e1n compostas exclusivamente por neutr\u00f3ns, nunca fora posible identificar sistemas ligados multineutr\u00f3nicos.<\/p>\n<p>Con todo, un novo traballo publicado en <a href=\"https:\/\/www.nature.com\/articles\/s41586-022-04827-6\"><em>Nature<\/em><\/a>, no que participaron as investigadoras do IGFAE <strong>Dolores Cortina Gil<\/strong> e <strong>Beatriz Fern\u00e1ndez Dom\u00ednguez<\/strong>, anuncia a primeira observaci\u00f3n dun estado de materia ex\u00f3tica formado por s\u00f3 catro neutr\u00f3ns: o <strong>tetraneutr\u00f3n<\/strong>. Os resultados present\u00e1ronse en primicia a semana pasada no congreso internacional DREB2022 organizado polo IGFAE, centro mixto da Universidade de Santiago de Compostela e a Xunta de Galicia.<\/p>\n<p>Este descubrimento \u00e9 <strong>clave para entender como funciona a forza nuclear<\/strong> que permite aos nucleones (os prot\u00f3ns e neutr\u00f3ns) manterse unidos no interior do n\u00facleo at\u00f3mico. Tam\u00e9n \u00e9 <strong>fundamental para entender a estrutura e composici\u00f3n das estrellas de neutr\u00f3ns<\/strong>. Nestes corpos os neutr\u00f3ns est\u00e1n ligados pola extrema forza gravitatoria do seu interior: concentran unha masa un pouco maior \u00e1 do Sol nun radio de apenas 10 km. Son ultra compactos e densos.<\/p>\n<p>O experimento realizouno unha colaboraci\u00f3n internacional na instalaci\u00f3n RIBF (<a href=\"https:\/\/www.nishina.riken.jp\/facility\/RIBFfacility.html\"><em>Radioactive Ion Beam Factory<\/em><\/a>) en RIKEN (Xap\u00f3n) e consid\u00e9rase un dos resultados da fase previa do <a href=\"https:\/\/fair-center.eu\/user\/experiments\/nustar\/experiments\/r3b\">experimento R3B<\/a> (do ingl\u00e9s, Reacci\u00f3ns con Feixes Relativistas Radioactivos). \u201cPara producir este novo estado de materia f\u00edxose interaccionar un feixe de n\u00facleos dun is\u00f3topo ex\u00f3tico do helio, o helio-8, acelerado a enerx\u00edas relativistas \u2012a velocidades pr\u00f3ximas \u00e1s da luz\u2012 contra un branco de hidr\u00f3xeno l\u00edquido\u201d, explica Dolores Cortina, unha das autoras do artigo, catedr\u00e1tica da Universidade de Santiago de Compostela e coordinadora do experimento R3B. \u201cTras a reacci\u00f3n, o n\u00facleo de helio-8 se fragmenta nunha part\u00edcula alfa e 4 neutr\u00f3ns. A partir dese momento a forza nuclear permite a interacci\u00f3n entre estes neutr\u00f3ns, dando lugar a este estado denominado tetraneutr\u00f3n e que agora caracterizamos medindo con moita precisi\u00f3n a part\u00edcula alfa arrancada\u201d.<\/p>\n<p>\u201cA medida permitir\u00e1 dar un paso adiante na comprensi\u00f3n da forza nuclear e representa un reto \u00e1 hora de poder explicala coas teor\u00edas ab-initio actuais\u201d, sinala a investigadora do IGFAE que tam\u00e9n asinou este traballo, Beatriz Fern\u00e1ndez Dom\u00ednguez. O pr\u00f3ximo obxectivo ser\u00e1 detectar directamente o sistema de catro neutr\u00f3ns e estudar eventuais correlaci\u00f3ns entre eles. \u201cUnha vez final\u00edcese a instalaci\u00f3n de FAIR, un novo centro de investigaci\u00f3n de f\u00edsica nuclear en Darmstadt (Alema\u00f1a), o experimento R3B permitir\u00e1 confirmar estes resultados mediante a detecci\u00f3n directa dos catro neutr\u00f3ns\u201d, apunta Cortina.<\/p>\n<p>Referencias:<\/p>\n<p>Duer, M., Aumann, T., Gernh\u00e4user, R.\u00a0<em>et al.<\/em>\u00a0Observation of a correlated free four-neutron system.\u00a0<em>Nature<\/em>\u00a0<strong>606,\u00a0<\/strong>678\u2013682 (2022). DOI: <a href=\"https:\/\/doi.org\/10.1038\/s41586-022-04827-6\">https:\/\/doi.org\/10.1038\/s41586-022-04827-6<\/a><\/p>\n<p>Imaxe: Dolores Cortina Gil e Beatriz Fern\u00e1ndez Dom\u00ednguez, investigadoras do IGFAE e profesoras da USC firmantes do art\u00edculo de Nature. Cr\u00e9dito: Elena Mora (IGFAE).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>O resultado publicouse na revista Nature e sup\u00f3n a primeira observaci\u00f3n compatible cun sistema da materia formado exclusivamente por neutr\u00f3ns. Este achado, clave para entender como funciona a forza nuclear, foi presentado en exclusiva no congreso DREB2022, organizado polo Instituto Galego de F\u00edsica de Altas Enerx\u00edas a semana pasada en Santiago de Compostela Unha das [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":11817,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[166,217],"class_list":["post-11821","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novas-2","category-novas-cientificas-2"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>As investigadoras do IGFAE Dolores Cortina e Beatriz Fern\u00e1ndez participan no descubrimento dun novo estado ex\u00f3tico da materia: o tetraneutr\u00f3n - IGFAE<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/igfae.usc.es\/igfae\/as-investigadoras-do-igfae-dolores-cortina-e-beatriz-fernandez-articipan-no-descubrimento-dun-novo-estado-exotico-da-materia-o-tetraneutron\/\" \/>\n<meta property=\"og:locale\" content=\"gl_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Investigadoras do IGFAE participan no descubrimento do tetraneutr\u00f3n\" \/>\n<meta property=\"og:description\" content=\"O resultado publicouse na revista Nature e sup\u00f3n a primeira observaci\u00f3n compatible cun sistema da materia formado exclusivamente por neutr\u00f3ns. 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