{"id":3535,"date":"2019-07-11T14:38:39","date_gmt":"2019-07-11T07:38:39","guid":{"rendered":"https:\/\/vinatom.gov.vn\/?p=3535"},"modified":"2019-07-11T14:38:39","modified_gmt":"2019-07-11T07:38:39","slug":"ket-qua-thuc-hien-de-tai-co-so-nghien-cuu-hieu-ung-phi-dinh-xu-cua-the-quang-hoc-nucleon-bang-phuong-phap-r-matrix","status":"publish","type":"post","link":"https:\/\/vinatom.gov.vn\/ket-qua-thuc-hien-de-tai-co-so-nghien-cuu-hieu-ung-phi-dinh-xu-cua-the-quang-hoc-nucleon-bang-phuong-phap-r-matrix\/","title":{"rendered":"K\u1ebft qu\u1ea3 th\u1ef1c hi\u1ec7n \u0111\u1ec1 t\u00e0i c\u01a1 s\u1edf \u201cNghi\u00ean c\u1ee9u hi\u1ec7u \u1ee9ng phi \u0111\u1ecbnh x\u1ee9 c\u1ee7a th\u1ebf quang h\u1ecdc nucleon b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p R-matrix\u201d"},"content":{"rendered":"<p style=\"text-align: justify\">\u0110\u1ec1 t\u00e0i khoa h\u1ecdc v\u00e0 c\u00f4ng ngh\u1ec7 c\u1ea5p c\u01a1 s\u1edf: \u201c<strong>Nghi\u00ean c\u1ee9u hi\u1ec7u \u1ee9ng phi \u0111\u1ecbnh x\u1ee9 c\u1ee7a th\u1ebf quang h\u1ecdc nucleon b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p R-matrix<\/strong>\u201d do CN. Do\u00e3n Th\u1ecb Loan, nghi\u00ean c\u1ee9u vi\u00ean 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 l\u00e0m ch\u1ee7 nhi\u1ec7m \u0111\u01b0\u1ee3c ph\u00ea duy\u1ec7t giao th\u1ef1c hi\u1ec7n t\u1eeb th\u00e1ng 1\/2018 \u0111\u1ebfn h\u1ebft th\u00e1ng 12\/2018.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify\">M\u1ee5c ti\u00eau nghi\u00ean c\u1ee9u c\u1ee7a \u0111\u1ec1 t\u00e0i l\u00e0 \u0111\u00e1nh gi\u00e1 s\u1ef1 \u1ea3nh h\u01b0\u1edfng c\u1ee7a hi\u1ec7u \u1ee9ng phi \u0111\u1ecbnh x\u1ee9 (non-locality) c\u1ee7a th\u1ebf quang h\u1ecdc (OP) nucleon l\u00ean ti\u1ebft di\u1ec7n t\u00e1n x\u1ea1 \u0111\u00e0n h\u1ed3i nucleon-h\u1ea1t nh\u00e2n s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p R-matrix, c\u1ee5 th\u1ec3 l\u00e0 c\u00e1c h\u1ea1t nh\u00e2n bia <sup>40<\/sup>Ca, <sup>90<\/sup>Zr v\u00e0 <sup>208<\/sup>Pb. \u0110\u00e2y s\u1ebd l\u00e0 ti\u1ec1n \u0111\u1ec1 cho c\u00e1c nghi\u00ean c\u1ee9u ti\u1ebfp theo v\u1ec1 \u1ea3nh h\u01b0\u1edfng c\u1ee7a hi\u1ec7u \u1ee9ng phi \u0111\u1ecbnh x\u1ee9 trong c\u00e1c ph\u1ea3n \u1ee9ng b\u1eaft nucleon nh\u01b0 (p,g), (n,g).<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify\">Th\u1ebf quang h\u1ecdc phi \u0111\u1ecbnh x\u1ee9 \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng vi m\u00f4 theo m\u1eabu folding, s\u1eed d\u1ee5ng t\u01b0\u01a1ng t\u00e1c nucleon-nucleon hi\u1ec7u d\u1ee5ng CDM3Yn \u0111\u01b0\u1ee3c nh\u00f3m nghi\u00ean c\u1ee9u s\u1eed d\u1ee5ng hi\u1ec7u qu\u1ea3 trong nh\u1eefng n\u0103m g\u1ea7n \u0111\u00e2y. Th\u1ebf quang h\u1ecdc n\u00e0y \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o code R-matrix \u0111\u1ec3 gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh t\u00e1n x\u1ea1 nh\u1eb1m t\u00ecm ra \u0111\u1ed9 l\u1ec7ch pha, ti\u1ebft di\u1ec7n t\u00e1n x\u1ea1 v\u00e0 so s\u00e1nh v\u1edbi s\u1ed1 li\u1ec7u th\u1ef1c nghi\u1ec7m. D\u1ef1a tr\u00ean vi\u1ec7c so s\u00e1nh k\u1ebft qu\u1ea3 trong hai tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng th\u1ebf quang h\u1ecdc \u0111\u1ecbnh x\u1ee9 v\u00e0 phi \u0111\u1ecbnh x\u1ee9 v\u1edbi s\u1ed1 li\u1ec7u th\u1ef1c nghi\u1ec7m c\u00f3 th\u1ec3 \u0111\u00e1nh gi\u00e1 d\u01b0\u1ee3c s\u1ef1 \u1ea3nh h\u01b0\u1edfng c\u1ee7a hi\u1ec7u \u1ee9ng phi \u0111\u1ecbnh.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify\">\u0110\u1ec3 ki\u1ec3m tra \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a ph\u01b0\u01a1ng ph\u00e1p R-matrix, nh\u00f3m nghi\u00ean c\u1ee9u \u0111\u00e3 so s\u00e1nh k\u1ebft qu\u1ea3 ti\u1ebft di\u1ec7n t\u00e1n x\u1ea1 \u0111\u00e0n h\u1ed3i nucleon s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p R-matrix v\u1edbi k\u1ebft qu\u1ea3 thu \u0111\u01b0\u1ee3c khi s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p l\u1eb7p, ph\u01b0\u01a1ng ph\u00e1p \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong vi\u1ec7c gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh Schr\u00f6dinger v\u1edbi th\u1ebf quang h\u1ecdc phi \u0111\u1ecbnh x\u1ee9. H\u00ecnh 1 bi\u1ec3u di\u1ec5n \u00a0k\u1ebft qu\u1ea3 t\u00ednh to\u00e1n ti\u1ebft di\u1ec7n vi ph\u00e2n theo ph\u00e2n b\u1ed1 g\u00f3c c\u1ee7a t\u00e1n x\u1ea1 \u0111\u00e0n h\u1ed3i neuton l\u00ean <sup>208<\/sup>Pb t\u1ea1i n\u0103ng l\u01b0\u1ee3ng neutron 14.6, 20, 26, 30.3, v\u00e0 40 MeV s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p <em>R<\/em>-matrix v\u00e0 ph\u01b0\u01a1ng ph\u00e1p l\u1eb7p (NLAT), d\u00f9ng chung th\u1ebf quang h\u1ecdc phi \u0111\u1ecbnh x\u1ee9 Perey-Buck (PB). Hai ph\u01b0\u01a1ng ph\u00e1p \u0111\u1ec1u cho c\u00e1c k\u1ebft qu\u1ea3 ti\u1ebft di\u1ec7n t\u00e1n x\u1ea1 g\u1ea7n nh\u01b0 tr\u00f9ng kh\u1edbp nhau \u1ee9ng v\u1edbi t\u1ea5t c\u1ea3 c\u00e1c g\u00f3c t\u1eeb [0:180<sup>o<\/sup>].<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify\">\u0110\u1ec3 \u0111\u00e1nh gi\u00e1 s\u1ef1 \u1ea3nh h\u01b0\u1edfng c\u1ee7a hi\u1ec7u \u1ee9ng phi \u0111\u1ecbnh x\u1ee9, nh\u1eefng k\u1ebft qu\u1ea3 thu \u0111\u01b0\u1ee3c \u0111\u1ed1i v\u1edbi th\u1ebf phi \u0111\u1ecbnh x\u1ee9 \u0111\u01b0\u1ee3c so s\u00e1nh v\u1edbi k\u1ebft qu\u1ea3 thu \u0111\u01b0\u1ee3c khi s\u1eed d\u1ee5ng th\u1ebf \u0111\u1ecbnh x\u1ee9 theo g\u1ea7n \u0111\u00fang BR. H\u00ecnh 2 m\u00f4 t\u1ea3 ti\u1ebft di\u1ec7n t\u00e1n x\u1ea1 \u0111\u00e0n h\u1ed3i c\u1ee7a neutron l\u00ean h\u1ea1t nh\u00e2n <sup>208<\/sup>Pb t\u1ea1i n\u0103ng l\u01b0\u1ee3ng 26, 30.4 v\u00e0 40 MeV c\u1ee7a neutron t\u1edbi. K\u1ebft qu\u1ea3 thu \u0111\u01b0\u1ee3c \u0111\u1ed1i v\u1edbi OP \u0111\u1ecbnh x\u1ee9 v\u00e0 phi \u0111\u1ecbnh x\u1ee9 kh\u00e1 g\u1ea7n nhau v\u00e0 \u0111\u1ec1u m\u00f4 t\u1ea3 t\u1ed1t \u0111\u01b0\u1ee3c s\u1ed1 li\u1ec7u th\u1ef1c nghi\u1ec7m. T\u00ednh ch\u00ednh x\u00e1c c\u1ee7a ph\u01b0\u01a1ng ph\u00e1p \u0111\u1ecbnh x\u1ee9 c\u0169ng \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n qua k\u1ebft qu\u1ea3 thu \u0111\u01b0\u1ee3c \u0111\u1ed1i t\u00e1n x\u1ea1 \u0111\u00e0n h\u1ed3i neutron l\u00ean h\u1ea1t nh\u00e2n <sup>40<\/sup>Ca (H\u00ecnh 3). Tuy nhi\u00ean, k\u1ebft qu\u1ea3 thu \u0111\u01b0\u1ee3c \u0111\u1ed1i v\u1edbi th\u1ebf quang h\u1ecdc phi \u0111\u1ecbnh x\u1ee9 g\u1ea7n h\u01a1n v\u1edbi c\u00e1c \u0111i\u1ec3m th\u1ef1c nghi\u1ec7m t\u1ea1i nh\u1eefng gi\u00e1 tr\u1ecb g\u00f3c l\u1edbn q\u2265100<sup>o<\/sup>. \u0110i\u1ec1u n\u00e0y cho th\u1ea5y r\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p x\u1ea5p x\u1ec9 \u0111\u1ecbnh x\u1ee9 c\u1ee7a th\u1ebf quang h\u1ecdc v\u1eabn t\u1ed1t \u0111\u1ed1i v\u1edbi ph\u00e2n t\u00edch t\u00e1n x\u1ea1 \u0111\u00e0n h\u1ed3i nucleon-h\u1ea1t nh\u00e2n.<\/p>\n<p style=\"text-align: center\"><strong><em><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3536 aligncenter\" src=\"https:\/\/vinatom.gov.vn\/wp-content\/uploads\/2019\/07\/INST-1.jpg\" alt=\"\" width=\"642\" height=\"468\" \/>H\u00ecnh 1<\/em><\/strong><em>. Ti\u1ebft di\u1ec7n t\u00e1n x\u1ea1 \u0111\u00e0n h\u1ed3i n+<sup>208<\/sup>Pb theo ph\u00e2n b\u1ed1 g\u00f3c t\u1ea1i n\u0103ng l\u01b0\u1ee3ng 14.6, 20, 26, 30.3 v\u00e0 40 MeV thu \u0111\u01b0\u1ee3c t\u1eeb m\u1eabu quang h\u1ecdc s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p R-matrix v\u00e0 ph\u01b0\u01a1ng ph\u00e1p l\u1eb7p (NLAT), s\u1eed d\u1ee5ng th\u1ebf quang h\u1ecdc phi \u0111\u1ecbnh x\u1ee9 PB<\/em><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center\"><strong><em><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3537 aligncenter\" src=\"https:\/\/vinatom.gov.vn\/wp-content\/uploads\/2019\/07\/INST-2.jpg\" alt=\"\" width=\"449\" height=\"468\" \/>H\u00ecnh 2<\/em><\/strong><em>. <\/em><em>Ti\u1ebft di\u1ec7n t\u00e1n x\u1ea1 \u0111\u00e0n h\u1ed3i n+<sup>208<\/sup>Pb t\u1ea1i n\u0103ng l\u01b0\u1ee3ng 26, 30.4 v\u00e0 40 MeV theo m\u1eabu quang h\u1ecdc v\u1edbi th\u1ebf folding ph\u1ee9c s\u1eed d\u1ee5ng t\u01b0\u01a1ng t\u00e1c CDM3Y6. K\u1ebft qu\u1ea3 thu \u0111\u01b0\u1ee3c khi gi\u1ea3i ch\u00ednh x\u00e1c ph\u01b0\u01a1ng tr\u00ecnh t\u00e1n x\u1ea1 v\u1edbi th\u1ebf folding phi \u0111\u1ecbnh x\u1ee9 \u0111\u01b0\u1ee3c so s\u00e1nh v\u1edbi tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng th\u1ebf \u0111\u1ecbnh x\u1ee9 theo g\u1ea7n \u0111\u00fang BR<\/em><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center\"><strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3538 aligncenter\" src=\"https:\/\/vinatom.gov.vn\/wp-content\/uploads\/2019\/07\/INST-3.jpg\" alt=\"\" width=\"449\" height=\"468\" \/> <em>H\u00ecnh 3. <\/em><\/strong><em>Ti\u1ebft di\u1ec7n t\u00e1n x\u1ea1 \u0111\u00e0n h\u1ed3i proton l\u00ean h\u1ea1t nh\u00e2n <\/em><em><sup>40<\/sup><\/em><em>Ca t\u1ea1i n\u0103ng l\u01b0\u1ee3ng 30,35 v\u00e0 40 MeV<\/em><em> theo m\u1eabu quang h\u1ecdc v\u1edbi th\u1ebf folding ph\u1ee9c s\u1eed d\u1ee5ng t\u01b0\u01a1ng t\u00e1c CDM3Y6<\/em><\/p>\n<p style=\"text-align: justify\"><strong>\u00a0<\/strong><\/p>\n<p style=\"text-align: justify\">Trong \u0111\u1ec1 t\u00e0i n\u00e0y, nh\u00f3m nghi\u00ean c\u1ee9u \u0111\u00e3 \u00e1p d\u1ee5ng th\u00e0nh c\u00f4ng ph\u01b0\u01a1ng ph\u00e1p <em>R<\/em>-matrix \u0111\u1ec3 m\u00f4 t\u1ea3 t\u00e1n x\u1ea1 \u0111\u00e0n h\u1ed3i nucleon l\u00ean h\u1ea1t nh\u00e2n s\u1eed d\u1ee5ng th\u1ebf quang h\u1ecdc phi \u0111\u1ecbnh x\u1ee9 \u0111\u01b0\u1ee3c \u0111\u1ec1 xu\u1ea5t b\u1edfi Perey v\u00e0 Buck, v\u00e0 m\u1ed9t s\u1ed1 phi\u00ean b\u1ea3n th\u1ebf t\u01b0\u01a1ng t\u1ef1 PB \u0111\u01b0\u1ee3c tham s\u1ed1 h\u00f3a g\u1ea7n \u0111\u00e2y. S\u1ef1 so s\u00e1nh k\u1ebft qu\u1ea3 thu \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng t\u01b0\u01a1ng t\u00e1c <em>R<\/em>-matrix v\u1edbi ph\u01b0\u01a1ng ph\u00e1p l\u1eb7p \u0111\u00e3 kh\u1eb3ng \u0111\u1ecbnh r\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p <em>R<\/em>-matrix l\u00e0 c\u00f4ng c\u1ee5 hi\u1ec7u qu\u1ea3 \u0111\u1ec3 s\u1eed d\u1ee5ng trong c\u00e1c t\u00ednh to\u00e1n t\u00e1n x\u1ea1 \u0111\u00e0n h\u1ed3i nucleon-h\u1ea1t nh\u00e2n v\u1edbi th\u1ebf quang h\u1ecdc phi \u0111\u1ecbnh x\u1ee9.\u00a0Hi\u1ec7u \u1ee9ng phi \u0111\u1ecbnh x\u1ee9 c\u1ee7a th\u1ebf quang h\u1ecdc nucleon \u0111\u00e3 \u0111\u01b0\u1ee3c kh\u1ea3o s\u00e1t c\u1ee5 th\u1ec3 qua so s\u00e1nh c\u00e1c k\u1ebft qu\u1ea3 t\u00ednh to\u00e1n ti\u1ebft di\u1ec7n t\u00e1n x\u1ea1 \u0111\u00e0n h\u1ed3i c\u1ee7a nucleon tr\u00ean c\u00e1c h\u1ea1t nh\u00e2n bia kh\u00e1c nhau s\u1eed d\u1ee5ng th\u1ebf quang h\u1ecdc \u0111\u1ecbnh x\u1ee9 \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng t\u1eeb m\u1eabu folding s\u1eed d\u1ee5ng t\u01b0\u01a1ng t\u00e1c CDM3Y6 ph\u1ee9c. T\u00ednh ch\u00ednh x\u00e1c c\u1ee7a ph\u01b0\u01a1ng ph\u00e1p \u0111\u1ecbnh x\u1ee9 c\u0169ng \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n qua k\u1ebft qu\u1ea3 thu \u0111\u01b0\u1ee3c \u0111\u1ed1i t\u00e1n x\u1ea1 \u0111\u00e0n h\u1ed3i nucleon l\u00ean m\u1ed9t s\u1ed1 h\u1ea1t nh\u00e2n trung b\u00ecnh v\u00e0 n\u1eb7ng.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify\">K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u c\u1ee7a \u0111\u1ec1 t\u00e0i \u0111\u00e3 \u0111\u01b0\u1ee3c b\u00e1o c\u00e1o t\u1ea1i H\u1ed9i ngh\u1ecb Khoa h\u1ecdc v\u00e0 C\u00f4ng ngh\u1ec7 h\u1ea1t nh\u00e2n cho c\u00e1n b\u1ed9 tr\u1ebb ng\u00e0nh n\u0103ng l\u01b0\u1ee3ng nguy\u00ean t\u1eed, th\u00e1ng 10\/2018 v\u00e0 \u0111\u01b0\u1ee3c \u0111\u0103ng t\u1ea3i tr\u00ean t\u1ea1p ch\u00ed Communication in Physics 28, 4 (2018).<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify\"><strong><em>Do\u00e3n Th\u1ecb Loan \u2013 Trung t\u00e2m V\u1eadt l\u00fd h\u1ea1t nh\u00e2n \u2013 Vi\u1ec7n Khoa h\u1ecdc v\u00e0 K\u1ef9 thu\u1eadt h\u1ea1t nh\u00e2n<\/em><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u0110\u1ec1 t\u00e0i khoa h\u1ecdc v\u00e0 c\u00f4ng ngh\u1ec7 c\u1ea5p c\u01a1 s\u1edf: \u201cNghi\u00ean c\u1ee9u hi\u1ec7u \u1ee9ng phi \u0111\u1ecbnh x\u1ee9 c\u1ee7a th\u1ebf quang h\u1ecdc nucleon b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p R-matrix\u201d do CN. Do\u00e3n Th\u1ecb Loan, nghi\u00ean c\u1ee9u vi\u00ean 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 l\u00e0m ch\u1ee7 nhi\u1ec7m \u0111\u01b0\u1ee3c ph\u00ea duy\u1ec7t giao [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3539,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22],"tags":[],"class_list":["post-3535","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hoi-nghi-hoi-thao"],"_links":{"self":[{"href":"https:\/\/vinatom.gov.vn\/wp-json\/wp\/v2\/posts\/3535","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=3535"}],"version-history":[{"count":0,"href":"https:\/\/vinatom.gov.vn\/wp-json\/wp\/v2\/posts\/3535\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vinatom.gov.vn\/wp-json\/"}],"wp:attachment":[{"href":"https:\/\/vinatom.gov.vn\/wp-json\/wp\/v2\/media?parent=3535"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vinatom.gov.vn\/wp-json\/wp\/v2\/categories?post=3535"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vinatom.gov.vn\/wp-json\/wp\/v2\/tags?post=3535"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}