{"id":6035,"date":"2011-06-28T21:59:17","date_gmt":"2011-06-28T21:59:17","guid":{"rendered":"https:\/\/t2k-experiment.org\/t2k\/"},"modified":"2023-02-08T05:51:15","modified_gmt":"2023-02-08T05:51:15","slug":"t2k","status":"publish","type":"page","link":"https:\/\/t2k-experiment.org\/vi\/t2k\/","title":{"rendered":"Gi\u1edbi thi\u1ec7u v\u1ec1 T2K<\/strong>"},"content":{"rendered":"
\"Map

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T2K (Tokai to Kamioka) l\u00e0 m\u1ed9t th\u00ed nghi\u1ec7m neutrino v\u1edbi \u0111\u01b0\u1eddng c\u01a1 s\u1edf d\u00e0i, \u0111\u01b0\u1ee3c \u0111\u1eb7t t\u1ea1i Nh\u1eadt B\u1ea3n, nghi\u00ean c\u1ee9u v\u1ec1 hi\u1ec7n t\u01b0\u1ee3ng dao \u0111\u1ed9ng neutrino. Neutrino l\u00e0 h\u1ea1t c\u01a1 b\u1ea3n c\u00f3 ba \u201ch\u01b0\u01a1ng v\u1ecb\u201d: electron, muon v\u00e0 tau (t\u01b0\u01a1ng \u1ee9ng v\u1edbi neutrino electron, neutrino muon v\u00e0 neutrino tau). Ch\u00fang ch\u1ec9 t\u01b0\u01a1ng t\u00e1c v\u1edbi v\u1eadt ch\u1ea5t ph\u1ea7n l\u1edbn th\u00f4ng qua l\u1ef1c y\u1ebfu v\u00e0 v\u00ec v\u1eady r\u1ea5t kh\u00f3 ph\u00e1t hi\u1ec7n. M\u1eb7t tr\u1eddi l\u00e0 m\u1ed9t trong nh\u1eefng ngu\u1ed3n neutrino electron \u0111\u01b0\u1ee3c t\u1ea1o ra v\u1edbi s\u1ed1 l\u01b0\u1ee3ng l\u1edbn v\u00e0 ch\u00fang c\u00f3 th\u1ec3 \u0111i xuy\u00ean qua Tr\u00e1i \u0111\u1ea5t m\u00e0 g\u1ea7n nh\u01b0 kh\u00f4ng t\u01b0\u01a1ng t\u00e1c.<\/p>\n

T2K \u0111\u00e3 ti\u1ebfn h\u00e0nh t\u00ecm ki\u1ebfm c\u00e1c dao \u0111\u1ed9ng neutrino t\u1eeb neutrino muon \u0111\u1ebfn neutrino electron v\u00e0 c\u00f4ng b\u1ed1 c\u00e1c d\u1ea5u hi\u1ec7u th\u1ef1c nghi\u1ec7m \u0111\u1ea7u ti\u00ean v\u00e0o th\u00e1ng 6 n\u0103m 2011. Nh\u1eefng dao \u0111\u1ed9ng n\u00e0y ch\u01b0a t\u1eebng \u0111\u01b0\u1ee3c quan s\u00e1t b\u1edfi b\u1ea5t k\u1ef3 th\u00ed nghi\u1ec7m n\u00e0o tr\u01b0\u1edbc \u0111\u00f3. T2K c\u0169ng \u0111ang th\u1ef1c hi\u1ec7n c\u00e1c ph\u00e9p \u0111o dao \u0111\u1ed9ng t\u1eeb neutrino muon \u0111\u1ebfn neutrino tau (\u0111\u00e3 \u0111\u01b0\u1ee3c quan s\u00e1t tr\u01b0\u1edbc \u0111\u00f3). \u0110\u00e2y s\u1ebd l\u00e0 nh\u1eefng ph\u00e9p \u0111o ch\u00ednh x\u00e1c nh\u1ea5t hi\u1ec7n nay v\u1ec1 x\u00e1c su\u1ea5t c\u1ee7a nh\u1eefng dao \u0111\u1ed9ng n\u00e0y v\u00e0 v\u1ec1 s\u1ef1 ch\u00eanh l\u1ec7ch gi\u1eefa kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a hai trong s\u1ed1 c\u00e1c neutrino (ch\u00ednh x\u00e1c l\u00e0 T2K \u0111o hi\u1ec7u gi\u1eefa b\u00ecnh ph\u01b0\u01a1ng c\u1ee7a nh\u1eefng kh\u1ed1i l\u01b0\u1ee3ng n\u00e0y).<\/p>\n

Ch\u00f9m tia neutrino t\u1ea1i T2K<\/strong><\/h2>\n

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Th\u00ed nghi\u1ec7m T2K g\u1eedi m\u1ed9t ch\u00f9m neutrino muon c\u1ef1c m\u1ea1nh t\u1eeb Tokai, \u1edf b\u1edd bi\u1ec3n ph\u00eda \u0111\u00f4ng Nh\u1eadt B\u1ea3n, \u0111\u1ebfn Kamioka \u1edf kho\u1ea3ng c\u00e1ch 295 km \u1edf ph\u00eda t\u00e2y Nh\u1eadt B\u1ea3n. Ch\u00f9m neutrino \u0111\u01b0\u1ee3c t\u1ea1o ra trong c\u00e1c va ch\u1ea1m gi\u1eefa ch\u00f9m proton v\u00e0 bia than ch\u00ec; nh\u1eefng va ch\u1ea1m n\u00e0y t\u1ea1o ra pion, sau \u0111\u00f3 \u0111\u01b0\u1ee3c h\u1ed9i t\u1ee5 th\u00e0nh m\u1ed9t ch\u00f9m b\u1edfi c\u00e1c thi\u1ebft b\u1ecb g\u1ecdi l\u00e0 \u201chorns\u201d th\u00f4ng qua t\u1eeb tr\u01b0\u1eddng . C\u00e1c \u00a0h\u1ea1t pion nhanh ch\u00f3ng ph\u00e2n h\u1ee7y th\u00e0nh muon v\u00e0 neutrino muon. C\u00e1c h\u1ea1t muon v\u00e0 b\u1ea5t k\u1ef3 proton v\u00e0 pion n\u00e0o c\u00f2n l\u1ea1i \u0111\u1ec1u b\u1ecb ch\u1eb7n b\u1edfi l\u1edbp than ch\u00ec th\u1ee9 hai (\u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 bia ch\u1eafn ch\u00f9m tia), nh\u01b0ng c\u00e1c h\u1ea1t neutrino v\u1eabn c\u00f3 th\u1ec3 \u0111i qua l\u1edbp n\u00e0y. N\u0103ng l\u01b0\u1ee3ng c\u1ee7a neutrino trong ch\u00f9m neutrino r\u1ea5t quan tr\u1ecdng v\u00ec dao \u0111\u1ed9ng neutrino ph\u1ee5 thu\u1ed9c v\u00e0o n\u00f3: neutrino n\u0103ng l\u01b0\u1ee3ng th\u1ea5p dao \u0111\u1ed9ng trong kho\u1ea3ng c\u00e1ch ng\u1eafn h\u01a1n so v\u1edbi neutrino n\u0103ng l\u01b0\u1ee3ng cao. Ch\u00f9m neutrino t\u1ea1i T2K c\u00f3 d\u1ea3i n\u0103ng l\u01b0\u1ee3ng ch\u1ee7 y\u1ebfu t\u1eadp trung \u1edf 600 MeV v\u00ec neutrino muon v\u1edbi n\u0103ng l\u01b0\u1ee3ng n\u00e0y c\u00f3 nhi\u1ec1u kh\u1ea3 n\u0103ng dao \u0111\u1ed9ng nh\u1ea5t sau khi di chuy\u1ec3n 295 km.<\/p>\n

T2K c\u0169ng \u0111\u00e3 b\u1eaft \u0111\u1ea7u (v\u00e0o n\u0103m 2014) l\u1ea5y d\u1eef li\u1ec7u v\u1edbi ch\u00f9m ph\u1ea3n neutrino muon. Ng\u01b0\u1eddi ta tin r\u1eb1ng l\u01b0\u1ee3ng v\u1eadt ch\u1ea5t v\u00e0 ph\u1ea3n v\u1eadt ch\u1ea5t \u0111\u01b0\u1ee3c t\u1ea1o ra trong v\u1ee5 n\u1ed5 Big Bang l\u00e0 b\u1eb1ng nhau v\u00e0 ng\u01b0\u1eddi ta kh\u00f4ng hi\u1ec3u t\u1ea1i sao V\u0169 tr\u1ee5 ng\u00e0y nay \u0111\u01b0\u1ee3c c\u1ea5u t\u1ea1o ho\u00e0n to\u00e0n b\u1eb1ng v\u1eadt ch\u1ea5t. M\u1ee5c \u0111\u00edch c\u1ee7a vi\u1ec7c s\u1eed d\u1ee5ng ch\u00f9m ph\u1ea3n neutrino l\u00e0 \u0111\u1ec3 t\u00ecm ki\u1ebfm gi\u1ea3i ph\u00e1p cho v\u1ea5n \u0111\u1ec1 n\u00e0y b\u1eb1ng c\u00e1ch so s\u00e1nh dao \u0111\u1ed9ng ph\u1ea3n neutrino v\u1edbi dao \u0111\u1ed9ng neutrino.<\/p>\n

H\u1ec7 th\u1ed1ng t\u01b0\u01a1ng t\u00e1c v\u00e0 thu nh\u1eadn t\u00edn hi\u1ec7u t\u1ea1i T2K<\/strong><\/h2>\n
\"Components

\u00a0The caption in the figure should be modified to: Componentes del detector cercano ND280<\/p><\/div>\n

\u0110i\u1ec1u c\u1ea7n thi\u1ebft l\u00e0 h\u01b0\u1edbng c\u1ee7a ch\u00f9m neutrino ph\u1ea3i \u1ed5n \u0111\u1ecbnh trong ph\u1ea1m vi 1\/20 \u0111\u1ed9 v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a ch\u00f9m kh\u00f4ng \u0111\u1ed5i theo th\u1eddi gian. Vi\u1ec7c ki\u1ec3m tra h\u01b0\u1edbng v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a ch\u00f9m tia \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n h\u00e0ng ng\u00e0y qua s\u1ef1 t\u01b0\u01a1ng t\u00e1c c\u1ee7a neutrino v\u1edbi s\u1eaft trong h\u1ec7 m\u00e1y INGRID (Interactive Neutrino GRID). H\u1ec7 n\u00e0y \u0111\u1eb7t c\u00e1ch bia 280 m\u00e9t tr\u00ean \u0111\u01b0\u1eddng \u0111i c\u1ee7a ch\u00f9m neutrino.<\/p>\n

T2K nghi\u00ean c\u1ee9u dao \u0111\u1ed9ng neutrino b\u1eb1ng hai h\u1ec7 th\u1ed1ng t\u01b0\u01a1ng t\u00e1c v\u00e0 thu t\u00edn hi\u1ec7u ri\u00eang bi\u1ec7t, c\u1ea3 hai \u0111\u01b0\u1ee3c \u0111\u1eb7t l\u1ec7ch ch\u00f9m neutrino m\u1ed9t g\u00f3c 2,5 \u0111\u1ed9. H\u1ec7 t\u01b0\u01a1ng t\u00e1c v\u00e0 thu t\u00edn hi\u1ec7u \u201cg\u1ea7n\u201d ND280 c\u00e1ch bia 280 m\u00e9t, gi\u00fap x\u00e1c \u0111\u1ecbnh s\u1ed1 l\u01b0\u1ee3ng neutrino muon trong ch\u00f9m tia tr\u01b0\u1edbc khi b\u1ea5t k\u1ef3 dao \u0111\u1ed9ng n\u00e0o x\u1ea3y ra. Neutrino s\u1eed d\u1ee5ng t\u1ea1i T2K c\u00f3 n\u0103ng l\u01b0\u1ee3ng cao h\u01a1n nhi\u1ec1u so v\u1edbi neutrino t\u1eeb M\u1eb7t tr\u1eddi, v\u00e0 neutrino n\u0103ng l\u01b0\u1ee3ng cao c\u00f3 nhi\u1ec1u kh\u1ea3 n\u0103ng t\u01b0\u01a1ng t\u00e1c h\u01a1n. M\u1ed9t s\u1ed1 l\u01b0\u1ee3ng nh\u1ecf neutrino muon t\u01b0\u01a1ng t\u00e1c v\u1edbi v\u1eadt li\u1ec7u nh\u1ea5p nh\u00e1y ho\u1eb7c n\u01b0\u1edbc trong h\u1ec7 ND280, v\u00e0 nhi\u1ec1u t\u01b0\u01a1ng t\u00e1c trong s\u1ed1 n\u00e0y t\u1ea1o ra muon. Muon l\u00e0 m\u1ed9t h\u1ea1t t\u00edch \u0111i\u1ec7n c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e1t hi\u1ec7n v\u00ec n\u00f3 ion h\u00f3a ch\u1ea5t kh\u00ed \u0111\u01b0\u1ee3c \u0111\u1eb7t ngay sau c\u00e1c \u0111i\u1ec3m t\u01b0\u01a1ng t\u00e1c. C\u00e1c ph\u00e9p \u0111o n\u00e0y \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 d\u1ef1 \u0111o\u00e1n s\u1ed1 l\u01b0\u1ee3ng neutrino muon s\u1ebd \u0111\u01b0\u1ee3c nh\u00ecn th\u1ea5y trong h\u1ec7 t\u01b0\u01a1ng t\u00e1c v\u00e0 thu t\u00edn hi\u1ec7u \u201cxa\u201d Super Kamiokande n\u1ebfu kh\u00f4ng c\u00f3 dao \u0111\u1ed9ng. H\u1ea7u h\u1ebft c\u00e1c h\u1ea1t neutrino \u0111i qua ND280 m\u00e0 kh\u00f4ng t\u01b0\u01a1ng t\u00e1c, v\u00e0 ch\u00fang di chuy\u1ec3n v\u1edbi t\u1ed1c \u0111\u1ed9 g\u1ea7n b\u1eb1ng t\u1ed1c \u0111\u1ed9 \u00e1nh s\u00e1ng t\u1edbi h\u1ec7 Super Kamiokande (Super K). N\u00f3 n\u1eb1m \u1edf \u0111\u1ed9 s\u00e2u 1000 m\u00e9t d\u01b0\u1edbi l\u00f2ng \u0111\u1ea5t \u1edf ph\u00eda t\u00e2y Nh\u1eadt B\u1ea3n v\u00e0 c\u00e1ch bia \u1edf Tokai 295 km. T\u1ea1i h\u1ec7 Super K, c\u00e1c h\u1ea1t neutrino \u0111i v\u00e0o m\u1ed9t bu\u1ed3ng h\u00ecnh tr\u1ee5 ch\u1ee9a n\u01b0\u1edbc si\u00eau tinh khi\u1ebft r\u1ea5t l\u1edbn. L\u00fac n\u00e0y, h\u1ea7u h\u1ebft neutrino \u0111i qua m\u00e0 kh\u00f4ng t\u01b0\u01a1ng t\u00e1c, nh\u01b0ng do n\u0103ng l\u01b0\u1ee3ng c\u1ee7a neutrino cao v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a ch\u00f9m tia l\u1edbn, v\u00ec v\u1eady v\u1eabn c\u00f3 m\u1ed9t l\u01b0\u1ee3ng h\u1ea1t t\u01b0\u01a1ng t\u00e1c v\u1edbi n\u01b0\u1edbc.<\/p>\n

La mayor\u00eda de los neutrinos atraviesan el ND280 sin interactuar, y \u00e9stos viajan a una velocidad cercana a la de la luz hasta Super Kamiokande (Super K). Este detector se encuentra a 1.000 metros bajo tierra en el oeste de Jap\u00f3n, a 295 km del blanco de grafito donde se producen los neutrinos en Tokai. En el detector Super K, los neutrinos entran en un cilindro muy grande de agua ultrapura. Una vez m\u00e1s, la mayor\u00eda de los neutrinos pasan sin interactuar pero, debido a las altas energ\u00edas de los neutrinos y a la intensidad del haz, algunos interact\u00faan con el agua.<\/span><\/p>\n

\"\"

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Nhi\u1ec1u t\u01b0\u01a1ng t\u00e1c c\u1ee7a neutrino muon t\u1ea1o ra muon, trong khi t\u01b0\u01a1ng t\u00e1c c\u1ee7a neutrino electron th\u01b0\u1eddng t\u1ea1o ra electron. Muon v\u00e0 electron l\u00e0 nh\u1eefng h\u1ea1t t\u00edch \u0111i\u1ec7n, v\u00e0 ch\u00fang chi\u1ebfm ch\u1ed7 c\u1ee7a c\u00e1c electron trong n\u01b0\u1edbc khi ch\u00fang \u0111i qua. Khi c\u00e1c electron n\u01b0\u1edbc tr\u1edf v\u1ec1 tr\u1ea1ng th\u00e1i c\u00e2n b\u1eb1ng c\u1ee7a ch\u00fang sau khi h\u1ea1t t\u00edch \u0111i\u1ec7n \u0111i qua, photon \u0111\u01b0\u1ee3c ph\u00e1t ra. N\u1ebfu h\u1ea1t t\u00edch \u0111i\u1ec7n chuy\u1ec3n \u0111\u1ed9ng nhanh h\u01a1n t\u1ed1c \u0111\u1ed9 \u00e1nh s\u00e1ng trong n\u01b0\u1edbc (b\u1eb1ng 3\/4 t\u1ed1c \u0111\u1ed9 \u00e1nh s\u00e1ng trong ch\u00e2n kh\u00f4ng), c\u00e1c photon n\u00e0y s\u1ebd ph\u00e1t ra d\u01b0\u1edbi d\u1ea1ng h\u00ecnh n\u00f3n, ch\u00fang \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 b\u1ee9c x\u1ea1 Cherenkov. To\u00e0n b\u1ed9 c\u00e1c m\u1eb7t c\u1ee7a bu\u1ed3ng ch\u1ee9a n\u01b0\u1edbc t\u1ea1i Super K \u0111\u01b0\u1ee3c bao ph\u1ee7 b\u1edfi h\u01a1n 10.000 b\u1ed9 nh\u00e2n quang \u0111i\u1ec7n c\u1ef1c nh\u1ea1y, gi\u00fap ph\u00e1t hi\u1ec7n d\u1ea1ng h\u00ecnh n\u00f3n \u0111\u1eb7c tr\u01b0ng c\u1ee7a b\u1ee9c x\u1ea1 Cherenkov qua h\u00ecnh \u1ea3nh nh\u1eefng v\u00f2ng tr\u00f2n t\u1ef1a nh\u01b0 nh\u1eefng chi\u1ebfc nh\u1eabn. Super K c\u00f3 th\u1ec3 ph\u00e2n bi\u1ec7t muon (t\u1ea1o ra v\u00f2ng s\u1eafc n\u00e9t) v\u1edbi c\u00e1c electron (t\u1ea1o ra v\u00f2ng nh\u01b0ng nh\u00f2e h\u01a1n).<\/p>\n

\"Cerenkov

<\/p><\/div>\n

\u0110\u1ec3 xem m\u1ed9t s\u1ef1 ki\u1ec7n g\u1ea7n nh\u01b0 tr\u1ef1c ti\u1ebfp t\u1eeb Super K, h\u00e3y nh\u1ea5p v\u00e0o \u0111\u00e2y<\/a>. B\u1ea1n s\u1ebd th\u1ea5y m\u1ed9t b\u1ea3n \u0111\u1ed3 c\u00e1c \u1ed1ng nh\u00e2n quang \u0111i\u1ec7n b\u00ean trong h\u1ec7 Super K, t\u1eeb m\u1ed9t s\u1ef1 ki\u1ec7n \u0111\u01b0\u1ee3c ghi l\u1ea1i c\u00e1ch \u0111\u00e2y kh\u00f4ng l\u00e2u. M\u00e0n h\u00ecnh s\u1ebd c\u1eadp nh\u1eadt v\u00e0i gi\u00e2y m\u1ed9t l\u1ea7n. \u0110\u00e2y ch\u1ec9 l\u00e0 m\u1ed9t m\u1eabu ng\u1eabu nhi\u00ean c\u1ee7a c\u00e1c s\u1ef1 ki\u1ec7n \u0111\u01b0\u1ee3c ghi l\u1ea1i m\u1ed7i gi\u00e2y t\u1ea1i Super K. (\u0110\u1ec3 \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch v\u1ec1 m\u00e0n h\u00ecnh hi\u1ec3n th\u1ecb s\u1ef1 ki\u1ec7n, nh\u1ea5n v\u00e0o \u0111\u00e2y<\/a>). H\u1ea7u h\u1ebft c\u00e1c s\u1ef1 ki\u1ec7n b\u1ea1n th\u1ea5y s\u1ebd l\u00e0 c\u00e1c v\u1ec7t muon \u0111i t\u1eeb tr\u00ean xu\u1ed1ng Tr\u00e1i \u0111\u1ea5t, KH\u00d4NG PH\u1ea2I neutrino t\u1eeb ch\u00f9m tia c\u1ee7a T2K! Tr\u00ean th\u1ef1c t\u1ebf, h\u1ea7u h\u1ebft c\u00e1c t\u01b0\u01a1ng t\u00e1c neutrino m\u00e0 ch\u00fang ta s\u00e0ng l\u1ecdc trong s\u1ed1 h\u00e0ng tri\u1ec7u s\u1ef1 ki\u1ec7n \u0111\u01b0\u1ee3c ghi l\u1ea1i t\u1ea1i Super K \u0111\u1ec1u do neutrino t\u1eeb M\u1eb7t tr\u1eddi ho\u1eb7c b\u1ea7u kh\u00ed quy\u1ec3n c\u1ee7a Tr\u00e1i \u0111\u1ea5t g\u00e2y ra. Ch\u1ec9 c\u00f3 v\u00e0i tr\u0103m t\u01b0\u01a1ng t\u00e1c neutrino m\u1ed7i n\u0103m l\u00e0 do c\u00e1c ch\u00f9m neutrino \u0111i t\u1eeb J-PARC.<\/p>\n

C\u00e1c dao \u0111\u1ed9ng t\u1eeb neutrino muon \u0111\u1ebfn neutrino electron \u0111\u01b0\u1ee3c nh\u00ecn th\u1ea5y trong Super K khi h\u00ecnh \u1ea3nh c\u00e1c v\u00f2ng tr\u00f2n kh\u00f4ng r\u00f5 n\u00e9t t\u1eeb c\u00e1c electron \u0111\u01b0\u1ee3c t\u1ea1o ra trong t\u01b0\u01a1ng t\u00e1c c\u1ee7a neutrino electron v\u1edbi n\u01b0\u1edbc. Hai m\u01b0\u01a1i t\u00e1m s\u1ef1 ki\u1ec7n electron- neutrino \u0111\u00e3 \u0111\u01b0\u1ee3c nh\u00ecn th\u1ea5y t\u1ea1i Super K, trong khi \u0111\u00f3 ch\u1ec9 c\u00f3 4,6 s\u1ef1 ki\u1ec7n \u0111\u01b0\u1ee3c mong \u0111\u1ee3i n\u1ebfu kh\u00f4ng c\u00f3 dao \u0111\u1ed9ng. X\u00e1c su\u1ea5t m\u00e0 28 s\u1ef1 ki\u1ec7n n\u00e0y x\u1ea3y ra kh\u00f4ng ph\u1ea3i do dao \u0111\u1ed9ng t\u1eeb neutrino muon \u0111\u1ebfn neutrino electron l\u00e0 r\u1ea5t nh\u1ecf, ch\u1ec9 \u1edf m\u1ee9c 10\u221213<\/sup> , v\u00e0 \u0111i\u1ec1u n\u00e0y x\u00e1c nh\u1eadn r\u1eb1ng nh\u1eefng dao \u0111\u1ed9ng n\u00e0y th\u01b0c s\u1ef1 \u0111\u00e3 x\u1ea3y ra.<\/p>\n

T2K c\u0169ng \u0111ang nghi\u00ean c\u1ee9u c\u00e1c dao \u0111\u1ed9ng t\u1eeb neutrino muon \u0111\u1ebfn neutrino tau v\u00e0 qu\u00e1 tr\u00ecnh n\u00e0y \u0111\u01b0\u1ee3c nh\u00ecn nh\u1eadn qua s\u1ef1 gi\u1ea3m s\u1ed1 l\u01b0\u1ee3ng neutrino muon \u0111\u01b0\u1ee3c ph\u00e1t hi\u1ec7n trong Super K so v\u1edbi d\u1ef1 \u0111o\u00e1n t\u1eeb ND280 v\u1edbi vi\u1ec7c kh\u00f4ng c\u00f3 dao \u0111\u1ed9ng.<\/p>\n

Nh\u1eefng \u01b0u \u0111i\u1ec3m c\u1ee7a th\u00ed nghi\u1ec7m ngo\u00e0i tr\u1ee5c ch\u00f9m tia<\/strong><\/h2>\n

T2K l\u00e0 th\u00ed nghi\u1ec7m neutrino ngo\u00e0i tr\u1ee5c ch\u00f9m tia \u0111\u1ea7u ti\u00ean tr\u00ean th\u1ebf gi\u1edbi, v\u1edbi ND280 v\u00e0 Super K \u0111\u01b0\u1ee3c \u0111\u1eb7t l\u1ec7ch ch\u00f9m neutrino 2,5 \u0111\u1ed9.<\/p>\n

V\u00f9ng ngo\u00e0i tr\u1ee5c c\u1ee7a ch\u00f9m tia c\u00f3 d\u1ea3i n\u0103ng l\u01b0\u1ee3ng h\u1eb9p h\u01a1n so v\u1edbi v\u00f9ng tr\u00ean tr\u1ee5c, v\u00ec th\u1ebf ph\u1ea7n l\u1edbn neutrino \u1edf v\u00f9ng ngo\u00e0i tr\u1ee5c thay \u0111\u1ed5i h\u01b0\u01a1ng v\u1ecb khi ch\u00fang \u0111i t\u1edbi Super K. Ngo\u00e0i ra, ph\u00e9p \u0111o quan tr\u1ecdng nh\u1ea5t l\u00e0 ph\u00e9p \u0111o n\u0103ng l\u01b0\u1ee3ng neutrino v\u00e0 ph\u00e9p \u0111o n\u00e0y \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n ch\u00ednh x\u00e1c nh\u1ea5t t\u1eeb c\u00e1c s\u1ef1 ki\u1ec7n trong \u0111\u00f3 m\u1ed9t neutrino t\u01b0\u01a1ng t\u00e1c v\u1edbi m\u1ed9t neutron trong h\u1ec7 m\u00e1y \u0111\u1ec3 t\u1ea1o ra m\u1ed9t muon v\u00e0 m\u1ed9t proton. M\u1eb7t kh\u00e1c, v\u00f9ng ngo\u00e0i tr\u1ee5c c\u1ee7a ch\u00f9m tia c\u00f3 t\u1ef7 l\u1ec7 c\u00e1c s\u1ef1 ki\u1ec7n n\u00e0y l\u1edbn h\u01a1n so v\u1edbi v\u00f9ng tr\u00ean tr\u1ee5c, cho ph\u00e9p T2K th\u1ef1c hi\u1ec7n c\u00e1c ph\u00e9p \u0111o n\u0103ng l\u01b0\u1ee3ng neutrino ch\u00ednh x\u00e1c h\u01a1n. \u0110i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn c\u00e1c ph\u00e9p \u0111o x\u00e1c su\u1ea5t dao \u0111\u1ed9ng neutrino v\u00e0 ch\u00eanh l\u1ec7ch kh\u1ed1i l\u01b0\u1ee3ng neutrino ch\u00ednh x\u00e1c h\u01a1n so v\u1edbi c\u00e1c ph\u00e9p \u0111o t\u1eeb c\u00e1c th\u00ed nghi\u1ec7m tr\u01b0\u1edbc \u0111\u00e2y.<\/p>\n","protected":false},"excerpt":{"rendered":"

T2K (Tokai to Kamioka) l\u00e0 m\u1ed9t th\u00ed nghi\u1ec7m neutrino v\u1edbi \u0111\u01b0\u1eddng c\u01a1 s\u1edf d\u00e0i, \u0111\u01b0\u1ee3c \u0111\u1eb7t t\u1ea1i Nh\u1eadt B\u1ea3n, nghi\u00ean c\u1ee9u v\u1ec1 hi\u1ec7n t\u01b0\u1ee3ng dao \u0111\u1ed9ng neutrino. Neutrino l\u00e0 h\u1ea1t c\u01a1 b\u1ea3n c\u00f3 ba \u201ch\u01b0\u01a1ng v\u1ecb\u201d: electron, muon v\u00e0 tau (t\u01b0\u01a1ng \u1ee9ng v\u1edbi neutrino electron, neutrino muon v\u00e0 neutrino tau). Ch\u00fang ch\u1ec9 t\u01b0\u01a1ng t\u00e1c v\u1edbi…<\/p>\n

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