{"id":9322,"date":"2021-06-10T11:02:06","date_gmt":"2021-06-10T09:02:06","guid":{"rendered":"http:\/\/localhost:8888\/igfae-ber\/?p=9322"},"modified":"2024-04-12T14:23:11","modified_gmt":"2024-04-12T12:23:11","slug":"neutrino-detector-dune","status":"publish","type":"post","link":"https:\/\/igfae.usc.es\/igfae\/neutrino-detector-dune\/","title":{"rendered":"Tecnolox\u00eda do IGFAE para desenmascarar aos escorregadizos neutrinos"},"content":{"rendered":"

Un equipo do Instituto Galego de F\u00edsica de Altas Enerx\u00edas (IGFAE) traballa no desenvolvemento dunha nova t\u00e9cnica de detecci\u00f3n para o experimento DUNE, o m\u00e1is sofisticado do mundo no estudo dos neutrinos, situado entre o acelerador de part\u00edculas PIP-II, en Fermilab, e o laboratorio subterr\u00e1neo de Sanford (EE. UU.). Entre os obxectivos cient\u00edficos de DUNE at\u00f3pase a observaci\u00f3n, cunha precisi\u00f3n sen precedentes, de como os neutrinos cambian de identidade ou \u2018sabor\u2019 mentres se desprazan, o que poder\u00eda axudar a explicar a asimetr\u00eda observada entre a materia e antimateria no noso universo.<\/strong><\/p>\n

Os neutrinos son fantasmas extremadamente veloces do mundo subat\u00f3mico. Como a s\u00faa masa \u00e9 tan pequena e non te\u00f1en carga el\u00e9ctrica \u2012de a\u00ed o de neutrino\u2012 apenas interaccionan con outras part\u00edculas. De feito, son tan lixeiros e debilmente interactuantes que o mundo en que vivimos res\u00faltalles altamente transparente. Hainos de 3 tipos \u2012electr\u00f3nicos, mu\u00f3nicos e tau\u00f3nicos\u2012 e mentres viaxan polo espazo van mutando de identidade (\u2018sabor\u2019, na xerga do campo) segundo a diferenza de masa entre eles. Determinar as propiedades dos neutrinos de forma directa \u00e9 ademais moi dif\u00edcil, pero existen m\u00e9todos indirectos para co\u00f1ecer a s\u00faa natureza e comportamento escorregadizo que poden ser claves para responder a unha das grandes cuesti\u00f3ns actuais da f\u00edsica: por que hai m\u00e1is materia que antimateria no universo?<\/p>\n

Para contribu\u00edr a este obxectivo nace ND-GAr, un detector de neutrinos<\/strong> en cuxo dese\u00f1o est\u00e1 a participar un equipo do IGFAE liderado polo investigador Diego Gonz\u00e1lez-D\u00edaz. ND-GAr instalarase nos pr\u00f3ximos anos nun dos maiores experimentos de neutrinos xamais constru\u00eddo, DUNE (Deep Underground Neutrino Experiment<\/em>) do Laboratorio Nacional Fermi, pr\u00f3ximo a Chicago. O acelerador PIP-II de Fermilab disparar\u00e1 prot\u00f3ns acelerados a case a velocidade da luz contra un branco, creando o chorro de neutrinos m\u00e1is potente do mundo ata a data. Preto da fonte de neutrinos situarase o detector pr\u00f3ximo (\u2018Near Detector<\/em>\u2019), onde se instalar\u00e1 o ND-GAr, e a 1.300 quil\u00f3metros de distancia recibiraos outro detector, o detector afastado (\u2018Far Detector<\/em>\u2019). Durante esa viaxe a m\u00e1is dun quil\u00f3metro baixo terra, os neutrinos cambian as s\u00faas propiedades e o obxectivo de ND-GAr \u00e9 contribu\u00edr \u00e1 determinaci\u00f3n, coa maior precisi\u00f3n ata a data, de cantos neutrinos conv\u00e9rtense en antineutrinos durante a viaxe, e viceversa. A comunidade cient\u00edfica cre que, se conseguimos caracterizar suficientemente ben estas min\u00fasculas oscilaci\u00f3ns de neutrinos<\/strong>, poderemos resolver o misterio polo que cal a materia goberna sobre a antimateria no noso universo.<\/p>\n

\"\"<\/a>

Esquema do Near Detector (Detector Cercano) que se instalar\u00e1 en DUNE e os seus distintos subcompo\u00f1entes. En vermello, a c\u00e1mara TPC que est\u00e1 a ser dese\u00f1ada por un equipo do IGFAE. Cr\u00e9dito: colaboraci\u00f3n DUNE.<\/p><\/div>\n

A clave poder\u00eda estar no diferente comportamento de neutrinos e antineutrinos fronte ao fen\u00f3meno de oscilaci\u00f3n que, no baleiro, caracter\u00edzase a trav\u00e9s do denominado \u201c\u00e1ngulo (fase) de violaci\u00f3n carga-paridade (CP) no sector lept\u00f3nico\u201d. Unha vez confirmado e, especialmente, cuantificado, este diferente comportamento entre neutrinos e antineutrinos, resulta posible establecer relaci\u00f3ns te\u00f3ricas entre fen\u00f3menos an\u00e1logos para outras part\u00edculas\/antipart\u00edculas fundamentais do Modelo Est\u00e1ndar de f\u00edsica de part\u00edculas. En particular, as s\u00faas interacci\u00f3ns e, en \u00faltima instancia, a maneira na que a materia e antimateria creouse e destru\u00edu durante a orixe do universo, facendo prevalecer de maneira asim\u00e9trica unha das d\u00faas.<\/p>\n

Tras a pegada dos neutrinos con c\u00e1maras TPC<\/strong><\/p>\n

ND-GAr \u00e9 unha c\u00e1mara de proxecci\u00f3n temporal (TPC), un tipo de detector que combina campos el\u00e9ctricos e magn\u00e9ticos con gases ricos en arg\u00f3n no caso de DUNE, permitindo as\u00ed reconstru\u00edr en 3D a traxectoria das part\u00edculas producidas nas interacci\u00f3ns dos neutrinos. O equipo do IGFAE est\u00e1 a dese\u00f1ar un m\u00e9todo para ler a escintilaci\u00f3n ou brillo inicial que se produce cando o feixe de neutrinos interacciona co gas do detector. Isto permitir\u00e1 suprimir eventos que non estean asociados co feixe de neutrinos, as\u00ed como mellorar a reconstruci\u00f3n das part\u00edculas cargadas emerxentes. En concreto, mellorar\u00e1 a estimaci\u00f3n da enerx\u00eda e o \u00e1ngulo de dispersi\u00f3n dos neutr\u00f3ns e raios-gamma que se producen en interacci\u00f3ns de ‘corrente neutra’, un tipo de interacci\u00f3n do neutrino que presenta unhas caracter\u00edsticas de reconstruci\u00f3n especialmente complicadas e que por iso est\u00e1 moito menos estudada ata a data.<\/p>\n

\"\"<\/a>

Esquema do ND-GAr, mostrando a c\u00e1mara TPC (HPgTPC), rodeada do calor\u00edmetro electromagn\u00e9tico (ECAL). Cr\u00e9dito: colaboraci\u00f3n DUNE.<\/p><\/div>\n

\u201cUn aspecto particularmente interesante deste proxecto \u00e9 que agora estamos a empezar a comprender o potencial do detector para reconstru\u00edr part\u00edculas producidas en conxunci\u00f3n co feixe de neutrinos e preditas en diferentes extensi\u00f3ns do Modelo Est\u00e1ndar\u201d, sinala Diego Gonz\u00e1lez-D\u00edaz, coordinador do proxecto. \u201cPara conseguilo \u00e9 esencial poder obter o tempo da interacci\u00f3n, e a detecci\u00f3n en fase gasosa representa significativas melloras en comparaci\u00f3n con outras t\u00e9cnicas existentes\u201d.<\/p>\n

\u201cA\u00ednda necesitamos comprender mellor os aspectos t\u00e9cnicos, pero a demostraci\u00f3n experimental da existencia dunha mestura de gas fortemente centeladora a 10 atmosferas de presi\u00f3n, xunto coa estabilidade operacional dun mini ND-GAr constru\u00eddo no IGFAE, marcou un antes e un despois. O traballo persistente de Pablo Amedo e Sara Leardini, estudantes de doutoramento do IGFAE, xunto con apoio t\u00e9cnico de David Jos\u00e9 Fern\u00e1ndez e David Gonz\u00e1lez Caama\u00f1o (t\u00e9cnico de IGFAE) nos \u00faltimos meses foi incrible\u201d.<\/p>\n

Na actualidade, est\u00e1 a avaliarse a resposta completa da TPC para determinar de forma m\u00e1is cuantitativa o impacto do sinal lum\u00ednica producida polos neutrinos ao interaccionar co gas nas diferentes canles de f\u00edsica. Este traballo real\u00edzase con simulaci\u00f3ns por computador, utilizando o software Geant4 e os datos das medidas experimentais que lidera a investigadora postdoutoral do IGFAE \u00c1ngela Saa. \u201cEste traballo tam\u00e9n permitir\u00e1 establecer como optimizar a lectura \u00f3ptica, en particular, que sensores usar e como configuralos. O noso obxectivo \u00e9, cara a final de ano, implementar no IGFAE a tecnolox\u00eda seleccionada para a detecci\u00f3n de luz nun mini- ND-GAr xa de tama\u00f1o medio (20 litros). Estamos a\u00ednda moi lonxe de entender de maneira completa as novas posibilidades que se nos est\u00e1n abrindo, pero o horizonte cient\u00edfico-tecnol\u00f3xico \u00e9 fascinante\u201d, apunta Diego G\u00f3nzalez-D\u00edaz.<\/p>\n

Proxecto internacional con participaci\u00f3n espa\u00f1ola<\/strong><\/p>\n

DUNE \u00e9 un consorcio internacional formado por m\u00e1is de 1000 cient\u00edficos, 200 instituci\u00f3ns e 30 pa\u00edses, onde o IGFAE participa con este proxecto no que traballan na actualidade \u00c1ngela Saa, Pablo Amedo, Sara Leardini, Miguel Morales, David Jos\u00e9 Fern\u00e1ndez, Alberto S\u00e1nchez e David Gonz\u00e1lez. Ademais de numerosos colaboradores internacionais, en Espa\u00f1a conta co apoio de investigadores do Instituto de F\u00edsica Corpuscular (IFIC), do Centro de Investigaci\u00f3ns Enerx\u00e9ticas, Ambientais e Tecnol\u00f3xicas (CIEMAT) e Universidade de Granada.<\/p>\n

Este proxecto est\u00e1 financiado polo programa IGNITE* do IGFAE e o programa H2020 a trav\u00e9s do proxecto AIDAinnova para o desenvolvemento e transferencia de novas tecnolox\u00edas de detectores de part\u00edculas en Europa durante os pr\u00f3ximos 4 anos e, en concreto, para a optimizaci\u00f3n de TPCs presurizadas de nova xeraci\u00f3n con lectura \u00f3ptica.<\/p>\n

Referencias:<\/p>\n

Preprint: \u201cDeep Underground Neutrino Experiment (DUNE) Near Detector Conceptual Design Report\u201d. <\/em>DUNE\u00a0Collaboration. arXiv:2103.13910v1<\/a><\/p>\n

Imaxe principal: Mini ND-GAr, prototipo construido no IGFAE do detector ND-GAr que se instalar\u00e1 en DUNE. Cr\u00e9dito: IGFAE.<\/p>\n","protected":false},"excerpt":{"rendered":"

Un equipo do Instituto Galego de F\u00edsica de Altas Enerx\u00edas (IGFAE) traballa no desenvolvemento dunha nova t\u00e9cnica de detecci\u00f3n para o experimento DUNE, o m\u00e1is sofisticado do mundo no estudo dos neutrinos, situado entre o acelerador de part\u00edculas PIP-II, en Fermilab, e o laboratorio subterr\u00e1neo de Sanford (EE. UU.). Entre os obxectivos cient\u00edficos de DUNE […]<\/p>\n","protected":false},"author":7,"featured_media":9306,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[166,217],"class_list":["post-9322","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novas-2","category-novas-cientificas-2"],"acf":[],"yoast_head":"\nTecnolox\u00eda do IGFAE para desenmascarar aos escorregadizos neutrinos - 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\/neutrino-detector-dune\/\" \/>\n<meta property=\"og:locale\" content=\"gl_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Tecnolox\u00eda do IGFAE para desenmascarar aos escorregadizos neutrinos\" \/>\n<meta property=\"og:description\" content=\"Un equipo do Instituto Galego de F\u00edsica de Altas Enerx\u00edas (IGFAE) traballa no desenvolvemento dunha nova t\u00e9cnica de detecci\u00f3n para o experimento DUNE, o m\u00e1is sofisticado do mundo no estudo dos neutrinos, situado entre o acelerador de part\u00edculas PIP-II, en Fermilab, e o laboratorio subterr\u00e1neo de Sanford (EE. 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