First Indication of Solar8BNeutrinos through Coherent Elastic Neutrino-Nucleus Scattering in PandaX-4T

IF 8.1 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Zihao Boet al.(PandaX Collaboration)
{"title":"First Indication of Solar8BNeutrinos through Coherent Elastic Neutrino-Nucleus Scattering in PandaX-4T","authors":"Zihao Boet al.(PandaX Collaboration)","doi":"10.1103/physrevlett.133.191001","DOIUrl":null,"url":null,"abstract":"The PandaX-4T liquid xenon detector at the China Jinping Underground Laboratory is used to measure the solar <mjx-container ctxtmenu_counter=\"242\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(5 0 1 2 3 4)\"><mjx-mrow><mjx-mmultiscripts data-semantic-children=\"0,1,2,3,4\" data-semantic-collapsed=\"(5 0 1 2 3 4)\" data-semantic- data-semantic-owns=\"0 1 2 3 4\" data-semantic-role=\"latinletter\" data-semantic-speech=\"Superscript 8 Baseline normal upper B\" data-semantic-type=\"tensor\"><mjx-prescripts style=\"vertical-align: 0.363em;\"><mjx-row><mjx-cell><mjx-mrow size=\"s\"><mjx-mn data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"leftsuper\" data-semantic-type=\"number\"><mjx-c>8</mjx-c></mjx-mn></mjx-mrow></mjx-cell></mjx-row><mjx-row style=\"height: 0.602em;\"></mjx-row><mjx-row><mjx-cell><mjx-none data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"leftsub\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row></mjx-prescripts><mjx-mrow><mjx-mi data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"latinletter\" data-semantic-type=\"identifier\"><mjx-c>B</mjx-c></mjx-mi></mjx-mrow><mjx-scripts style=\"vertical-align: 0.363em;\"><mjx-row><mjx-cell><mjx-none data-semantic-added=\"true\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"rightsuper\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row><mjx-row style=\"height: 0.61em;\"></mjx-row><mjx-row><mjx-cell><mjx-none data-semantic-added=\"true\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"rightsub\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row></mjx-scripts></mjx-mmultiscripts></mjx-mrow></mjx-math></mjx-container> neutrino flux by detecting neutrinos through coherent scattering with xenon nuclei. Data samples requiring the coincidence of scintillation and ionization signals (paired), as well as unpaired ionization-only signals (US2), are selected with energy threshold of approximately 1.1 keV (0.33 keV) nuclear recoil energy. Combining the commissioning run and the first science run of PandaX-4T, a total exposure of 1.20 and <mjx-container ctxtmenu_counter=\"243\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(10 0 1 2 (6 3 4 5))\"><mjx-mrow data-semantic-children=\"0,1,2,6\" data-semantic-collapsed=\"(10 (c 7 8 9) 0 1 2 6)\" data-semantic- data-semantic-owns=\"0 1 2 6\" data-semantic-role=\"text\" data-semantic-speech=\"1.04 t o n n e dot y e a r\" data-semantic-type=\"punctuated\"><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"10\" data-semantic-role=\"float\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.645em;\">1</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.645em;\">.</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.645em;\">0</mjx-c><mjx-c style=\"padding-top: 0.645em;\">4</mjx-c></mjx-mn><mjx-mtext data-semantic-annotation=\"clearspeak:unit\" data-semantic- data-semantic-parent=\"10\" data-semantic-role=\"space\" data-semantic-type=\"text\" style='font-family: MJX-STX-ZERO, \"Helvetica Neue\", Helvetica, Roboto, Arial, sans-serif;'><mjx-utext style=\"font-size: 90.6%; padding: 0.828em 0px 0.221em; width: 3px;\" variant=\"-explicitFont\"> </mjx-utext></mjx-mtext><mjx-mtext data-semantic-annotation=\"clearspeak:unit\" data-semantic- data-semantic-parent=\"10\" data-semantic-role=\"space\" data-semantic-type=\"text\" style='font-family: MJX-STX-ZERO, \"Helvetica Neue\", Helvetica, Roboto, Arial, sans-serif;'><mjx-utext style=\"font-size: 90.6%; padding: 0.828em 0px 0.221em; width: 3px;\" variant=\"-explicitFont\"> </mjx-utext></mjx-mtext><mjx-mrow data-semantic-added=\"true\" data-semantic-children=\"3,5\" data-semantic-content=\"4\" data-semantic- data-semantic-owns=\"3 4 5\" data-semantic-parent=\"10\" data-semantic-role=\"multiplication\" data-semantic-type=\"infixop\"><mjx-mi data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"6\" data-semantic-role=\"unknown\" data-semantic-type=\"identifier\"><mjx-c noic=\"true\" style=\"padding-top: 0.61em;\">t</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.61em;\">o</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.61em;\">n</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.61em;\">n</mjx-c><mjx-c style=\"padding-top: 0.61em;\">e</mjx-c></mjx-mi><mjx-mo data-semantic- data-semantic-operator=\"infixop,·\" data-semantic-parent=\"6\" data-semantic-role=\"multiplication\" data-semantic-type=\"operator\" space=\"3\"><mjx-c>·</mjx-c></mjx-mo><mjx-mi data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"6\" data-semantic-role=\"unknown\" data-semantic-type=\"identifier\" space=\"3\"><mjx-c noic=\"true\" style=\"padding-top: 0.488em;\">y</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.488em;\">e</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.488em;\">a</mjx-c><mjx-c style=\"padding-top: 0.488em;\">r</mjx-c></mjx-mi></mjx-mrow></mjx-mrow></mjx-math></mjx-container> are collected for the paired and US2, respectively. After unblinding, 3 and 332 events are observed with an expectation of <mjx-container ctxtmenu_counter=\"244\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(3 0 1 2)\"><mjx-mrow data-semantic-children=\"0,2\" data-semantic-content=\"1\" data-semantic- data-semantic-owns=\"0 1 2\" data-semantic-role=\"addition\" data-semantic-speech=\"2.8 plus or minus 0.5\" data-semantic-type=\"infixop\"><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"3\" data-semantic-role=\"float\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.647em;\">2</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.647em;\">.</mjx-c><mjx-c style=\"padding-top: 0.647em;\">8</mjx-c></mjx-mn><mjx-mo data-semantic- data-semantic-operator=\"infixop,±\" data-semantic-parent=\"3\" data-semantic-role=\"addition\" data-semantic-type=\"operator\" space=\"3\"><mjx-c>±</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"3\" data-semantic-role=\"float\" data-semantic-type=\"number\" space=\"3\"><mjx-c noic=\"true\" style=\"padding-top: 0.642em;\">0</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.642em;\">.</mjx-c><mjx-c style=\"padding-top: 0.642em;\">5</mjx-c></mjx-mn></mjx-mrow></mjx-math></mjx-container> and <mjx-container ctxtmenu_counter=\"245\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math breakable=\"true\" data-semantic-children=\"0,2\" data-semantic-content=\"1\" data-semantic- data-semantic-owns=\"0 1 2\" data-semantic-role=\"addition\" data-semantic-speech=\"251 plus or minus 32\" data-semantic-structure=\"(3 0 1 2)\" data-semantic-type=\"infixop\"><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"3\" data-semantic-role=\"integer\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.644em;\">2</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.644em;\">5</mjx-c><mjx-c style=\"padding-top: 0.644em;\">1</mjx-c></mjx-mn><mjx-break size=\"3\"></mjx-break><mjx-mo data-semantic- data-semantic-operator=\"infixop,±\" data-semantic-parent=\"3\" data-semantic-role=\"addition\" data-semantic-type=\"operator\"><mjx-c>±</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"3\" data-semantic-role=\"integer\" data-semantic-type=\"number\" space=\"3\"><mjx-c noic=\"true\" style=\"padding-top: 0.644em;\">3</mjx-c><mjx-c style=\"padding-top: 0.644em;\">2</mjx-c></mjx-mn></mjx-math></mjx-container> background events, for the paired and US2 data, respectively. A combined analysis yields a best-fit <mjx-container ctxtmenu_counter=\"246\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(5 0 1 2 3 4)\"><mjx-mrow><mjx-mmultiscripts data-semantic-children=\"0,1,2,3,4\" data-semantic-collapsed=\"(5 0 1 2 3 4)\" data-semantic- data-semantic-owns=\"0 1 2 3 4\" data-semantic-role=\"latinletter\" data-semantic-speech=\"Superscript 8 Baseline normal upper B\" data-semantic-type=\"tensor\"><mjx-prescripts style=\"vertical-align: 0.363em;\"><mjx-row><mjx-cell><mjx-mrow size=\"s\"><mjx-mn data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"leftsuper\" data-semantic-type=\"number\"><mjx-c>8</mjx-c></mjx-mn></mjx-mrow></mjx-cell></mjx-row><mjx-row style=\"height: 0.602em;\"></mjx-row><mjx-row><mjx-cell><mjx-none data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"leftsub\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row></mjx-prescripts><mjx-mrow><mjx-mi data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"latinletter\" data-semantic-type=\"identifier\"><mjx-c>B</mjx-c></mjx-mi></mjx-mrow><mjx-scripts style=\"vertical-align: 0.363em;\"><mjx-row><mjx-cell><mjx-none data-semantic-added=\"true\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"rightsuper\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row><mjx-row style=\"height: 0.61em;\"></mjx-row><mjx-row><mjx-cell><mjx-none data-semantic-added=\"true\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"rightsub\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row></mjx-scripts></mjx-mmultiscripts></mjx-mrow></mjx-math></mjx-container> neutrino signal of 3.5 (75) events from the paired (US2) data sample, with <mjx-container ctxtmenu_counter=\"247\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math breakable=\"true\" data-semantic-children=\"4,2\" data-semantic-content=\"2\" data-semantic- data-semantic-owns=\"4 2\" data-semantic-role=\"endpunct\" data-semantic-speech=\"tilde 37 percent sign\" data-semantic-structure=\"(5 (4 3 0 1) 2)\" data-semantic-type=\"punctuated\"><mjx-mrow data-semantic-added=\"true\" data-semantic-children=\"3,1\" data-semantic-content=\"0\" data-semantic- data-semantic-owns=\"3 0 1\" data-semantic-parent=\"5\" data-semantic-role=\"equality\" data-semantic-type=\"relseq\" inline-breaks=\"true\"><mjx-mrow data-semantic-added=\"true\" data-semantic- data-semantic-parent=\"4\" data-semantic-role=\"unknown\" data-semantic-type=\"empty\"></mjx-mrow><mjx-break size=\"0\"></mjx-break><mjx-mo data-semantic- data-semantic-operator=\"relseq,∼\" data-semantic-parent=\"4\" data-semantic-role=\"equality\" data-semantic-type=\"relation\"><mjx-c>∼</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"4\" data-semantic-role=\"integer\" data-semantic-type=\"number\" space=\"4\"><mjx-c noic=\"true\" style=\"padding-top: 0.644em;\">3</mjx-c><mjx-c style=\"padding-top: 0.644em;\">7</mjx-c></mjx-mn></mjx-mrow><mjx-mo data-semantic- data-semantic-operator=\"punctuated\" data-semantic-parent=\"5\" data-semantic-role=\"unknown\" data-semantic-type=\"punctuation\"><mjx-c>%</mjx-c></mjx-mo></mjx-math></mjx-container> uncertainty, and the background-only hypothesis is disfavored at <mjx-container ctxtmenu_counter=\"248\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(3 0 2 1)\"><mjx-mrow data-semantic-annotation=\"clearspeak:simple;clearspeak:unit\" data-semantic-children=\"0,1\" data-semantic-content=\"2\" data-semantic- data-semantic-owns=\"0 2 1\" data-semantic-role=\"implicit\" data-semantic-speech=\"2.64 sigma\" data-semantic-type=\"infixop\"><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"3\" data-semantic-role=\"float\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.646em;\">2</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.646em;\">.</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.646em;\">6</mjx-c><mjx-c style=\"padding-top: 0.646em;\">4</mjx-c></mjx-mn><mjx-mo data-semantic-added=\"true\" data-semantic- data-semantic-operator=\"infixop,⁢\" data-semantic-parent=\"3\" data-semantic-role=\"multiplication\" data-semantic-type=\"operator\"><mjx-c>⁢</mjx-c></mjx-mo><mjx-mi data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"italic\" data-semantic- data-semantic-parent=\"3\" data-semantic-role=\"greekletter\" data-semantic-type=\"identifier\"><mjx-c>𝜎</mjx-c></mjx-mi></mjx-mrow></mjx-math></mjx-container> significance. This gives a solar <mjx-container ctxtmenu_counter=\"249\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(5 0 1 2 3 4)\"><mjx-mrow><mjx-mmultiscripts data-semantic-children=\"0,1,2,3,4\" data-semantic-collapsed=\"(5 0 1 2 3 4)\" data-semantic- data-semantic-owns=\"0 1 2 3 4\" data-semantic-role=\"latinletter\" data-semantic-speech=\"Superscript 8 Baseline normal upper B\" data-semantic-type=\"tensor\"><mjx-prescripts style=\"vertical-align: 0.363em;\"><mjx-row><mjx-cell><mjx-mrow size=\"s\"><mjx-mn data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"leftsuper\" data-semantic-type=\"number\"><mjx-c>8</mjx-c></mjx-mn></mjx-mrow></mjx-cell></mjx-row><mjx-row style=\"height: 0.602em;\"></mjx-row><mjx-row><mjx-cell><mjx-none data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"leftsub\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row></mjx-prescripts><mjx-mrow><mjx-mi data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"latinletter\" data-semantic-type=\"identifier\"><mjx-c>B</mjx-c></mjx-mi></mjx-mrow><mjx-scripts style=\"vertical-align: 0.363em;\"><mjx-row><mjx-cell><mjx-none data-semantic-added=\"true\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"rightsuper\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row><mjx-row style=\"height: 0.61em;\"></mjx-row><mjx-row><mjx-cell><mjx-none data-semantic-added=\"true\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"rightsub\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row></mjx-scripts></mjx-mmultiscripts></mjx-mrow></mjx-math></mjx-container> neutrino flux of <mjx-container ctxtmenu_counter=\"250\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(30 (6 0 (5 1 2 3) 4) 7 (29 (10 8 9) 11 12 (17 13 (16 14 15)) 18 (23 19 (22 20 21))))\"><mjx-mrow data-semantic-children=\"6,29\" data-semantic-content=\"7\" data-semantic- data-semantic-owns=\"6 7 29\" data-semantic-role=\"multiplication\" data-semantic-speech=\"left parenthesis 8.4 plus or minus 3.1 right parenthesis times 10 Superscript 6 Baseline c m Superscript negative 2 Baseline normal s Superscript negative 1\" data-semantic-type=\"infixop\"><mjx-mrow data-semantic-children=\"5\" data-semantic-content=\"0,4\" data-semantic- data-semantic-owns=\"0 5 4\" data-semantic-parent=\"30\" data-semantic-role=\"leftright\" data-semantic-type=\"fenced\"><mjx-mo data-semantic- data-semantic-operator=\"fenced\" data-semantic-parent=\"6\" data-semantic-role=\"open\" data-semantic-type=\"fence\" style=\"vertical-align: -0.02em;\"><mjx-c>(</mjx-c></mjx-mo><mjx-mrow data-semantic-added=\"true\" data-semantic-children=\"1,3\" data-semantic-content=\"2\" data-semantic- data-semantic-owns=\"1 2 3\" data-semantic-parent=\"6\" data-semantic-role=\"addition\" data-semantic-type=\"infixop\"><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"float\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.647em;\">8</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.647em;\">.</mjx-c><mjx-c style=\"padding-top: 0.647em;\">4</mjx-c></mjx-mn><mjx-mo data-semantic- data-semantic-operator=\"infixop,±\" data-semantic-parent=\"5\" data-semantic-role=\"addition\" data-semantic-type=\"operator\" space=\"3\"><mjx-c>±</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"float\" data-semantic-type=\"number\" space=\"3\"><mjx-c noic=\"true\" style=\"padding-top: 0.644em;\">3</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.644em;\">.</mjx-c><mjx-c style=\"padding-top: 0.644em;\">1</mjx-c></mjx-mn></mjx-mrow><mjx-mo data-semantic- data-semantic-operator=\"fenced\" data-semantic-parent=\"6\" data-semantic-role=\"close\" data-semantic-type=\"fence\" style=\"vertical-align: -0.02em;\"><mjx-c>)</mjx-c></mjx-mo></mjx-mrow><mjx-mo data-semantic- data-semantic-operator=\"infixop,×\" data-semantic-parent=\"30\" data-semantic-role=\"multiplication\" data-semantic-type=\"operator\" space=\"3\"><mjx-c>×</mjx-c></mjx-mo><mjx-mrow data-semantic-children=\"10,11,12,17,18,23\" data-semantic-collapsed=\"(29 (c 24 25 26 27 28) 10 11 12 17 18 23)\" data-semantic- data-semantic-owns=\"10 11 12 17 18 23\" data-semantic-parent=\"30\" data-semantic-role=\"text\" data-semantic-type=\"punctuated\" space=\"3\"><mjx-msup data-semantic-children=\"8,9\" data-semantic- data-semantic-owns=\"8 9\" data-semantic-parent=\"29\" data-semantic-role=\"integer\" data-semantic-type=\"superscript\"><mjx-mrow><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"10\" data-semantic-role=\"integer\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.642em;\">1</mjx-c><mjx-c style=\"padding-top: 0.642em;\">0</mjx-c></mjx-mn></mjx-mrow><mjx-script style=\"vertical-align: 0.369em;\"><mjx-mrow size=\"s\"><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"10\" data-semantic-role=\"integer\" data-semantic-type=\"number\"><mjx-c>6</mjx-c></mjx-mn></mjx-mrow></mjx-script></mjx-msup><mjx-mtext data-semantic-annotation=\"clearspeak:unit\" data-semantic- data-semantic-parent=\"29\" data-semantic-role=\"space\" data-semantic-type=\"text\" style='font-family: MJX-STX-ZERO, \"Helvetica Neue\", Helvetica, Roboto, Arial, sans-serif;'><mjx-utext style=\"font-size: 90.6%; padding: 0.828em 0px 0.221em; width: 3px;\" variant=\"-explicitFont\"> </mjx-utext></mjx-mtext><mjx-mtext data-semantic-annotation=\"clearspeak:unit\" data-semantic- data-semantic-parent=\"29\" data-semantic-role=\"space\" data-semantic-type=\"text\" style='font-family: MJX-STX-ZERO, \"Helvetica Neue\", Helvetica, Roboto, Arial, sans-serif;'><mjx-utext style=\"font-size: 90.6%; padding: 0.828em 0px 0.221em; width: 3px;\" variant=\"-explicitFont\"> </mjx-utext></mjx-mtext><mjx-msup data-semantic-children=\"13,16\" data-semantic- data-semantic-owns=\"13 16\" data-semantic-parent=\"29\" data-semantic-role=\"unknown\" data-semantic-type=\"superscript\"><mjx-mrow><mjx-mi data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"17\" data-semantic-role=\"unknown\" data-semantic-type=\"identifier\"><mjx-c noic=\"true\" style=\"padding-top: 0.485em;\">c</mjx-c><mjx-c style=\"padding-top: 0.485em;\">m</mjx-c></mjx-mi></mjx-mrow><mjx-script style=\"vertical-align: 0.363em;\"><mjx-mrow data-semantic-annotation=\"clearspeak:simple\" data-semantic-children=\"15\" data-semantic-content=\"14\" data-semantic- data-semantic-owns=\"14 15\" data-semantic-parent=\"17\" data-semantic-role=\"negative\" data-semantic-type=\"prefixop\" size=\"s\"><mjx-mo data-semantic- data-semantic-operator=\"prefixop,−\" data-semantic-parent=\"16\" data-semantic-role=\"subtraction\" data-semantic-type=\"operator\"><mjx-c>−</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"16\" data-semantic-role=\"integer\" data-semantic-type=\"number\"><mjx-c>2</mjx-c></mjx-mn></mjx-mrow></mjx-script></mjx-msup><mjx-mtext data-semantic-annotation=\"clearspeak:unit\" data-semantic- data-semantic-parent=\"29\" data-semantic-role=\"space\" data-semantic-type=\"text\" style='font-family: MJX-STX-ZERO, \"Helvetica Neue\", Helvetica, Roboto, Arial, sans-serif;'><mjx-utext style=\"font-size: 90.6%; padding: 0.828em 0px 0.221em; 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引用次数: 0

Abstract

The PandaX-4T liquid xenon detector at the China Jinping Underground Laboratory is used to measure the solar 8B neutrino flux by detecting neutrinos through coherent scattering with xenon nuclei. Data samples requiring the coincidence of scintillation and ionization signals (paired), as well as unpaired ionization-only signals (US2), are selected with energy threshold of approximately 1.1 keV (0.33 keV) nuclear recoil energy. Combining the commissioning run and the first science run of PandaX-4T, a total exposure of 1.20 and 1.04tonne·year are collected for the paired and US2, respectively. After unblinding, 3 and 332 events are observed with an expectation of 2.8±0.5 and 251±32 background events, for the paired and US2 data, respectively. A combined analysis yields a best-fit 8B neutrino signal of 3.5 (75) events from the paired (US2) data sample, with 37% uncertainty, and the background-only hypothesis is disfavored at 2.64𝜎 significance. This gives a solar 8B neutrino flux of (8.4±3.1)×106cm2s1, consistent with the standard solar model prediction. It is also the first indication of solar 8B neutrino “fog” in a dark matter direct detection experiment.

Abstract Image

通过熊猫X-4T中的相干弹性中微核散射首次发现太阳8B中微子
中国锦屏地下实验室的PandaX-4T液态氙探测器通过探测中微子与氙核的相干散射来测量太阳8B中微子通量。数据样本要求闪烁信号和电离信号(配对)以及非配对的纯电离信号(US2)重合,能量阈值约为 1.1 千伏(0.33 千伏)核反冲能量。结合 PandaX-4T 的调试运行和首次科学运行,配对信号和 US2 信号的总曝光量分别为 1.20 吨/年和 1.04 吨/年。解除绑定后,配对数据和 US2 数据分别观测到 3 和 332 个事件,预期背景事件分别为 2.8±0.5 和 251±32。综合分析得出,配对(US2)数据样本中最佳拟合的8B中微子信号为3.5(75)个事件,不确定性为∼37%,纯背景假说不成立,显著性为2.64𝜎。由此得出太阳 8B 中微子通量为 (8.4±3.1)×106 cm-2 s-1,与标准太阳模型的预测一致。这也是暗物质直接探测实验中首次出现太阳8B中微子 "雾 "的迹象。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Physical review letters
Physical review letters 物理-物理:综合
CiteScore
16.50
自引率
7.00%
发文量
2673
审稿时长
2.2 months
期刊介绍: Physical review letters(PRL)covers the full range of applied, fundamental, and interdisciplinary physics research topics: General physics, including statistical and quantum mechanics and quantum information Gravitation, astrophysics, and cosmology Elementary particles and fields Nuclear physics Atomic, molecular, and optical physics Nonlinear dynamics, fluid dynamics, and classical optics Plasma and beam physics Condensed matter and materials physics Polymers, soft matter, biological, climate and interdisciplinary physics, including networks
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