{"id":1530,"date":"2018-06-05T14:47:05","date_gmt":"2018-06-05T07:47:05","guid":{"rendered":"http:\/\/vinatom.gov.vn\/?p=1530"},"modified":"2023-11-28T08:51:56","modified_gmt":"2023-11-28T01:51:56","slug":"ket-qua-thuc-hien-de-tai-cap-co-so-nghien-cuu-ky-thuat-nhan-dien-hat-cua-he-pho-ke-tu-bigrips-va-zerodegree-tai-riken-thong-qua-cac-so-lieu-thuc-nghiem-seastar","status":"publish","type":"post","link":"https:\/\/vinatom.gov.vn\/ket-qua-thuc-hien-de-tai-cap-co-so-nghien-cuu-ky-thuat-nhan-dien-hat-cua-he-pho-ke-tu-bigrips-va-zerodegree-tai-riken-thong-qua-cac-so-lieu-thuc-nghiem-seastar\/","title":{"rendered":"K\u1ebft qu\u1ea3 th\u1ef1c hi\u1ec7n \u0111\u1ec1 t\u00e0i c\u1ea5p C\u01a1 s\u1edf \u201cNghi\u00ean c\u1ee9u k\u1ef9 thu\u1eadt nh\u1eadn di\u1ec7n h\u1ea1t c\u1ee7a h\u1ec7 ph\u1ed5 k\u1ebf t\u1eeb BigRIPS v\u00e0 ZeroDegree t\u1ea1i RIKEN th\u00f4ng qua c\u00e1c s\u1ed1 li\u1ec7u th\u1ef1c nghi\u1ec7m SEASTAR\u201d"},"content":{"rendered":"

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\u0110\u00e2y l\u00e0 \u0111\u1ec1 t\u00e0i nghi\u00ean c\u1ee9u v\u1edbi m\u1ee5c ti\u00eau ch\u00ednh l\u00e0: Nghi\u00ean c\u1ee9u nh\u1eadn di\u1ec7n c\u00e1c \u0111\u1ed3ng v\u1ecb ph\u00f3ng x\u1ea1 gi\u00e0u n\u01a1tron n\u1eb1m xa v\u00f9ng b\u1ec1n c\u00f3 Z t\u1eeb 25 \u0111\u1ebfn 28 s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p B\u03c1 – \u2206E – TOF <\/em>(B\u03c1 l\u00e0 \u0111\u1ed9 c\u1ee9ng t\u1eeb tr\u01b0\u1eddng, \u0394E l\u00e0 \u0111\u1ed9 m\u1ea5t n\u0103ng l\u01b0\u1ee3ng\u00a0 v\u00e0 TOF l\u00e0 th\u1eddi gian bay) c\u1ee7a h\u1ec7 ph\u1ed5 k\u1ebf t\u1eeb BigRIPS v\u00e0 ZeroDegree t\u1ea1i vi\u1ec7n nghi\u00ean c\u1ee9u H\u00f3a L\u00fd RIKEN, Nh\u1eadt B\u1ea3n. B\u00ean c\u1ea1nh \u0111\u00f3, qu\u00e1 tr\u00ecnh th\u1ef1c hi\u1ec7n \u0111\u1ec1 t\u00e0i gi\u00fap n\u00e2ng cao k\u1ef9 n\u0103ng ph\u00e2n t\u00edch v\u00e0 x\u1eed l\u00fd s\u1ed1 li\u1ec7u th\u1ef1c nghi\u1ec7m c\u1ee7a c\u00e1c c\u00e1n b\u1ed9 tr\u1ebb trong nh\u00f3m v\u1eadt l\u00fd h\u1ea1t nh\u00e2n th\u1ef1c nghi\u1ec7m c\u1ee7a Trung t\u00e2m V\u1eadt l\u00fd H\u1ea1t nh\u00e2n, Vi\u1ec7n Khoa h\u1ecdc v\u00e0 K\u1ef9 thu\u1eadt h\u1ea1t nh\u00e2n. S\u1ed1 li\u1ec7u th\u1ef1c nghi\u1ec7m s\u1eed d\u1ee5ng ph\u00e2n t\u00edch trong \u0111\u1ec1 t\u00e0i \u0111\u01b0\u1ee3c nh\u00f3m tr\u1ef1c ti\u1ebfp tham gia \u0111o \u0111\u1ea1c n\u0103m 2014 trong chi\u1ebfn d\u1ecbch th\u00ed nghi\u1ec7m l\u1ea7n th\u1ee9 nh\u1ea5t c\u1ee7a d\u1ef1 \u00e1n SEASTAR (vi\u1ebft t\u1eaft c\u1ee7a Shell Evolution And Search for Two-plus energies At RIBF – S\u1ef1 ti\u1ebfn tri\u1ec3n c\u1ee7a l\u1edbp v\u1ecf v\u00e0 cu\u1ed9c t\u00ecm ki\u1ebfm m\u1ed9t c\u00e1ch h\u1ec7 th\u1ed1ng c\u00e1c tr\u1ea1ng th\u00e1i hai c\u1ed9ng t\u1ea1i RIBF <\/em>). \u0110\u1ec3 th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c m\u1ee5c ti\u00eau n\u00e0y, nh\u00f3m t\u00e1c gi\u1ea3 \u0111\u00e3 \u0111\u1ec1 xu\u1ea5t v\u00e0 th\u1ef1c hi\u1ec7n c\u00e1c n\u1ed9i dung nh\u01b0 sau:<\/p>\n

– T\u00ecm hi\u1ec3u c\u1ea5u t\u1ea1o, nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a c\u00e1c h\u1ec7 ph\u1ed5 k\u1ebf t\u1eeb BigRIPS, ZeroDegree, v\u00e0 c\u00e1c h\u1ec7 detector ghi nh\u1eadn h\u1ea1t nh\u01b0 MUSIC, Plastic Scintillator.<\/p>\n

– Ph\u00e2n t\u00edch c\u00e1c tham s\u1ed1 th\u1eddi gian bay (TOF<\/em>) v\u00e0 \u0111\u1ed9 m\u1ea5t n\u0103ng l\u01b0\u1ee3ng \u0394E<\/em> trong b\u1ed9 s\u1ed1 li\u1ec7u c\u1ee7a chi\u1ebfn d\u1ecbch SEASTAR l\u1ea7n th\u1ee9 nh\u1ea5t \u0111\u00e3 \u0111\u01b0\u1ee3c \u0111o \u0111\u1ea1c, k\u1ebft h\u1ee3p v\u1edbi k\u1ebft qu\u1ea3 ph\u00e2n t\u00edch \u0111\u1ed9 c\u1ee9ng t\u1eeb tr\u01b0\u1eddng (B\u03c1<\/em>) nh\u1eb1m x\u00e1c \u0111\u1ecbnh c\u00e1c gi\u00e1 tr\u1ecb Z v\u00e0 t\u1ef7 s\u1ed1 A\/Q c\u1ee7a c\u00e1c h\u1ea1t.<\/p>\n

– Nghi\u00ean c\u1ee9u ph\u01b0\u01a1ng ph\u00e1p v\u00e0 th\u1ef1c hi\u1ec7n hi\u1ec7u ch\u1ec9nh \u0111\u1ec3 l\u00e0m t\u0103ng \u0111\u1ed9 ph\u00e2n gi\u1ea3i nh\u1eadn di\u1ec7n h\u1ea1t \u0111\u1ea1t \u0111\u1ebfn t\u1ed1i \u01b0u nh\u1ea5t trong h\u1ec7 \u0111o ZeroDegree.<\/p>\n

– Nh\u1eadn di\u1ec7n h\u1ea1t d\u1ef1a tr\u00ean t\u01b0\u01a1ng quan hai chi\u1ec1u c\u1ee7a Z v\u00e0 t\u1ef7 s\u1ed1 A\/Q \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng t\u1eeb c\u00e1c tham s\u1ed1 th\u1eddi gian bay (TOF<\/em>), \u0111\u1ed9 c\u1ee9ng t\u1eeb tr\u01b0\u1eddng (B\u03c1<\/em>) v\u00e0 \u0111\u1ed9 m\u1ea5t n\u0103ng l\u01b0\u1ee3ng (\u0394E<\/em>) \u0111\u00e3 nghi\u00ean c\u1ee9u \u1edf tr\u00ean.<\/p>\n

<\/p>\n

K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u \u0111\u00e3 nh\u1eadn di\u1ec7n \u0111\u01b0\u1ee3c c\u00e1c \u0111\u1ed3ng v\u1ecb c\u00f3 Z = 25 \u2013 28 bao g\u1ed3m: 13 \u0111\u1ed3ng v\u1ecb trong BigRIPS bao g\u1ed3m ^{69,70,71<\/sup>Ni, ^{68-70<\/sup> Co, ^{66- 69<\/sup>Fe, ^{65-67<\/sup>Mn; 18 \u0111\u1ed3ng v\u1ecb trong ZeroDegree g\u1ed3m ^{70<\/sup>Ni, ^{68-70<\/sup>Co, ^{65-69<\/sup>Fe, ^{62-67<\/sup>Mn. \u0110\u1ec1 t\u00e0i c\u0169ng \u0111\u00e3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c \u0111\u1ed9 ph\u00e2n gi\u1ea3i trung b\u00ecnh c\u1ee7a Z v\u00e0 t\u1ef7 s\u1ed1 A\/Q \u1edf BigRIPS t\u01b0\u01a1ng \u1ee9ng l\u00e0 0.94% v\u00e0 0.081%. \u0110\u1ed1i v\u1edbi\u00a0 ZeroDegree \u0111\u1ed9 ph\u00e2n gi\u1ea3i t\u01b0\u01a1ng \u0111\u1ed1i c\u1ee7a Z v\u00e0 A\/Q sau khi hi\u1ec7u ch\u1ec9nh l\u00e0 0.57% v\u00e0 0.145%.<\/p>\n}}}}}}}}

$\"\"$ <\/p>\n

H\u00ecnh 1: K\u1ebft qu\u1ea3 nh\u1eadn di\u1ec7n c\u00e1c h\u1ea1t c\u00f3 Z = 25-28 tr\u00ean h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1ch h\u1ea1t BigRIPS<\/em><\/p>\n

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Nh\u00f3m t\u00e1c gi\u1ea3 \u0111\u00e3 \u0111\u01b0a ra m\u1ed9t s\u1ed1 k\u1ebft lu\u1eadn nh\u01b0 sau: K\u1ef9 thu\u1eadt nh\u1eadn di\u1ec7n h\u1ea1t t\u1ea1i BigRIPS v\u00e0 ZeroDegree trong khu\u00f4n kh\u1ed5 th\u00ed nghi\u1ec7m SEASTAR d\u1ef1a tr\u00ean ph\u01b0\u01a1ng ph\u00e1p B\u03c1 \u2013 \u0394E – TOF l\u00e0 ph\u01b0\u01a1ng ph\u00e1p nh\u1eadn di\u1ec7n h\u1ea1t d\u1ef1a tr\u00ean c\u00e1c \u0111\u1eb7c t\u00ednh \u0111\u1ed9ng h\u1ecdc \u0111\u1ec3 nh\u1eadn di\u1ec7n v\u00e0 ph\u00e2n t\u00e1ch c\u00e1c \u0111\u1ed3ng v\u1ecb, \u0111\u00e2y l\u00e0 ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u hi\u1ec7n \u0111\u1ea1i, c\u00f3 \u0111\u1ed9 tin c\u1eady cao. \u0110\u1ec1 t\u00e0i nghi\u00ean c\u1ee9u \u0111\u00e3 th\u1ef1c hi\u1ec7n vi\u1ec7c hi\u1ec7u ch\u1ec9nh nh\u1eb1m c\u1ea3i thi\u1ec7n \u0111\u1ed9 ph\u00e2n gi\u1ea3i nh\u1eadn di\u1ec7n h\u1ea1t \u1edf ZeroDegree. C\u00e1c k\u1ebft qu\u1ea3 nh\u1eadn di\u1ec7n h\u1ea1t t\u1ea1i BigRIPS v\u00e0 ZerogDegree l\u00e0 c\u00e1c k\u1ebft qu\u1ea3 \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng trong qu\u00e1 tr\u00ecnh ph\u00e2n t\u00edch s\u1ed1 li\u1ec7u th\u1ef1c nghi\u1ec7m SEASTAR. T\u01b0\u01a1ng quan Z – A\/Q c\u1ee7a c\u00e1c h\u1ea1t nh\u00e2n quan t\u00e2m c\u1ee7a th\u00ed nghi\u1ec7m trong d\u1ea3i Z = 25 – 28 \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00e2n t\u00edch v\u00e0 hi\u1ec3n th\u1ecb r\u00f5 r\u00e0ng \u1edf c\u1ea3 BigRIPS (k\u00eanh v\u00e0o) v\u00e0 ZeroDegree (k\u00eanh ra). Trong \u0111\u00f3, ph\u1ed5 nh\u1eadn di\u1ec7n cho ph\u00e9p nh\u1eadn di\u1ec7n \u0111\u01b0\u1ee3c 13 \u0111\u1ed3ng v\u1ecb \u1edf k\u00eanh v\u00e0o v\u00e0 18 \u0111\u1ed3ng v\u1ecb \u1edf k\u00eanh ra. Ngo\u00e0i c\u00e1c \u0111\u1ed3ng v\u1ecb ^{67<\/sup>Mn, ^{67-69<\/sup>Fe, ^{68,69<\/sup>Co v\u00e0 ^{70<\/sup>Ni \u0111\u01b0\u1ee3c \u0111\u1ec1 xu\u1ea5t trong thuy\u1ebft minh, nh\u00f3m c\u00f2n nh\u1eadn di\u1ec7n \u0111\u01b0\u1ee3c th\u00eam nhi\u1ec1u c\u00e1c h\u1ea1t nh\u00e2n kh\u00e1c nh\u01b0 ^{62\u221266<\/sup>Mn, ^{64\u221266<\/sup>Fe, ^{67<\/sup>Co v\u00e0 ^{71<\/sup>Ni.<\/p>\n}}}}}}}}

$\"\"$ <\/p>\n

H\u00ecnh 2: K\u1ebft qu\u1ea3 nh\u1eadn di\u1ec7n h\u1ea1t b\u1eb1ng t\u01b0\u01a1ng quan Z- A\/Q c\u1ee7a c\u00e1c h\u1ea1t nh\u00e2n c\u00f3 Z = 25-28 t\u1ea1i ZeroDegree sau khi hi\u1ec7u ch\u1ec9nh<\/em><\/p>\n

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\u0110\u1ec1 t\u00e0i nghi\u00ean c\u1ee9u khoa h\u1ecdc c\u00f4ng ngh\u1ec7 c\u1ea5p c\u01a1 s\u1edf do c\u00e1c c\u00e1n b\u1ed9 tr\u1ebb thu\u1ed9c Trung t\u00e2m V\u1eadt l\u00fd h\u1ea1t nh\u00e2n th\u1ef1c hi\u1ec7n v\u00e0 c\u00e1c k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u \u0111\u00e3 \u0111\u01b0\u1ee3c c\u00f4ng b\u1ed1 trong 01 b\u00e1o c\u00e1o t\u1ea1i H\u1ed9i ngh\u1ecb Khoa h\u1ecdc v\u00e0 C\u00f4ng ngh\u1ec7 h\u1ea1t nh\u00e2n to\u00e0n qu\u1ed1c l\u1ea7n th\u1ee9 12, 2017 t\u1ea1i Nha Trang, \u00a0\u0111\u0103ng t\u1ea3i 01 b\u00e0i b\u00e1o tr\u00ean t\u1ea1p ch\u00ed Nuclear Science and Technology v\u00e0 ho\u00e0n th\u00e0nh 01 b\u00e1o c\u00e1o v\u1ec1 \u201cPh\u01b0\u01a1ng ph\u00e1p v\u00e0 k\u1ebft qu\u1ea3 nh\u1eadn di\u1ec7n h\u1ea1t c\u00f3 Z = 25 -28 c\u1ee7a BigRIPS v\u00e0 ZeroDgree\u201d. Ngo\u00e0i ra, c\u00e1c k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u c\u1ee7a nh\u00f3m t\u00e1c gi\u1ea3 li\u00ean quan \u0111\u1ebfn h\u01b0\u1edbng nghi\u00ean c\u1ee9u \u0111\u1ec1 t\u00e0i c\u00f2n c\u00f3 \u0111\u00f3ng g\u00f3p v\u00e0o m\u1ed9t s\u1ed1 c\u00f4ng b\u1ed1 qu\u1ed1c t\u1ebf c\u00f3 uy t\u00edn cao: \u00a0F. Flavigny, et al., Phys. Rev. Lett. 118, 242501 (2017), S. chen, et al., Phys. Rev. C 95, 041302(R) (2017), N. Paul, et al., Phys. Rev. Lett. 118, 032501 (2017), M. Lettmann, et al., Physics Review C 96, 011301 (R) (2017), C. M. Shand, et al., Physics Letters B 773, 492-497 (2017).<\/p>\n

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\u0110\u1ec1 t\u00e0i n\u00e0y l\u00e0 ph\u1ea7n quan tr\u1ecdng c\u1ee7a h\u01b0\u1edbng ph\u00e2n t\u00edch c\u00e1c b\u1ed9 s\u1ed1 li\u1ec7u trong d\u1ef1 \u00e1n SEASTAR c\u1ee7a nh\u00f3m t\u00e1c gi\u1ea3. C\u00e1c nghi\u00ean c\u1ee9u m\u1edf r\u1ed9ng sau \u0111\u1ec1 t\u00e0i l\u00e0 ph\u00e2n t\u00edch ph\u1ed5 gamma t\u1ee9c th\u1eddi v\u00e0 gamma tr\u1ec5 nh\u1eb1m x\u00e1c \u0111\u1ecbnh c\u00e1c d\u1ecbch chuy\u1ec3n gamma v\u00e0 x\u00e2y d\u1ef1ng c\u1ea5u tr\u00fac m\u1ee9c c\u1ee7a c\u00e1c h\u1ea1t nh\u00e2n l\u1ea1 n\u1eb1m xa v\u00f9ng b\u1ec1n ^{67,68,69,71<\/sup>Fe, ^{63,65<\/sup>Cr, ^{49<\/sup>Ar v\u00e0 ^{47,49<\/sup>Cl. C\u00e1c nghi\u00ean c\u1ee9u c\u0169ng l\u00e0 ph\u1ea7n n\u1ed9i dung quan tr\u1ecdng c\u1ee7a \u0111\u1ec1 t\u00e0i lu\u1eadn \u00e1n Ti\u1ebfn s\u0129 c\u1ee7a NCS B\u00f9i Duy Linh (ch\u1ee7 nhi\u1ec7m \u0111\u1ec1 t\u00e0i).<\/p>\n}}}}

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\u0110\u1ec1 t\u00e0i \u0111\u00e3 \u0111\u01b0\u1ee3c nghi\u1ec7m thu ch\u00ednh th\u1ee9c v\u00e0o ng\u00e0y 12\/4\/2018 v\u1edbi k\u1ebft qu\u1ea3 \u0111\u00e1nh gi\u00e1 lo\u1ea1i t\u1ed1t v\u00e0 \u0111ang trong qu\u00e1 tr\u00ecnh ho\u00e0n t\u1ea5t c\u00e1c th\u1ee7 t\u1ee5c \u0111\u1ec3 thanh l\u00fd h\u1ee3p \u0111\u1ed3ng.<\/p>\n

<\/p>\n

Ph\u00f2ng K\u1ebf ho\u1ea1ch v\u00e0 H\u1ee3p t\u00e1c qu\u1ed1c t\u1ebf – Vi\u1ec7n Khoa h\u1ecdc v\u00e0 K\u1ef9 thu\u1eadt h\u1ea1t nh\u00e2n<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Nhi\u1ec7m v\u1ee5 khoa h\u1ecdc v\u00e0 c\u00f4ng ngh\u1ec7 c\u1ea5p c\u01a1 s\u1edf: \u201cNghi\u00ean c\u1ee9u k\u1ef9 thu\u1eadt nh\u1eadn di\u1ec7n h\u1ea1t c\u1ee7a h\u1ec7 ph\u1ed5 k\u1ebf t\u1eeb BigRIPS v\u00e0 ZeroDegree t\u1ea1i RIKEN th\u00f4ng qua c\u00e1c s\u1ed1 li\u1ec7u th\u1ef1c nghi\u1ec7m SEASTAR\u201d do ThS. B\u00f9i Duy Linh l\u00e0m ch\u1ee7 nhi\u1ec7m \u0111\u01b0\u1ee3c ph\u00ea duy\u1ec7t giao th\u1ef1c hi\u1ec7n trong th\u1eddi gian 1 n\u0103m t\u1eeb […]<\/p>\n","protected":false},"author":1,"featured_media":12832,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,26],"tags":[],"class_list":["post-1530","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hoat-dong-nghien-cuu-trien-khai","category-tin-tong-hop"],"_links":{"self":[{"href":"https:\/\/vinatom.gov.vn\/wp-json\/wp\/v2\/posts\/1530","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vinatom.gov.vn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vinatom.gov.vn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vinatom.gov.vn\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/vinatom.gov.vn\/wp-json\/wp\/v2\/comments?post=1530"}],"version-history":[{"count":2,"href":"https:\/\/vinatom.gov.vn\/wp-json\/wp\/v2\/posts\/1530\/revisions"}],"predecessor-version":[{"id":12834,"href":"https:\/\/vinatom.gov.vn\/wp-json\/wp\/v2\/posts\/1530\/revisions\/12834"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vinatom.gov.vn\/wp-json\/wp\/v2\/media\/12832"}],"wp:attachment":[{"href":"https:\/\/vinatom.gov.vn\/wp-json\/wp\/v2\/media?parent=1530"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vinatom.gov.vn\/wp-json\/wp\/v2\/categories?post=1530"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vinatom.gov.vn\/wp-json\/wp\/v2\/tags?post=1530"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}