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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 熊怡(Yee Bob Hsiung) | |
| dc.contributor.author | Po-An Chen | en |
| dc.contributor.author | 陳柏安 | zh_TW |
| dc.date.accessioned | 2021-06-16T06:30:20Z | - |
| dc.date.available | 2020-08-24 | |
| dc.date.copyright | 2020-08-24 | |
| dc.date.issued | 2020 | |
| dc.date.submitted | 2020-08-17 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/56851 | - |
| dc.description.abstract | 本論文分為兩個部分，一部份在於以不同以往的分析信號在大亞灣實驗中量測微中子震盪混合角θ13，另一部份著重在江門微中子觀測站之三吋光電倍增管的建製與測試。 大亞灣微中子震盪實驗在2012 年發表了第一個統計上信心水準大於5 σ 的微中子震盪混合角θ13 量測結果，確信了θ13 非零值。而大亞灣實驗在2018 的最新發表結果依舊是目前最精準之θ13 量測，此量測是依靠逆β 衰變產物中的中子-釓捕捉信號來完成。異於前述分析，本文中的θ13 量測是利用中子-釓, 中子-氫, 及微量中子-碳捕捉信號，而量測結果sin2 2θ13 = 0.077 ± 0.0070(Stat) ± 0.0047(Syst)以9.1 σ 的信心水準再次佐證了θ13 的非零值假設。此結果與日前大亞灣最精準的量測結果差距為1.02 σ, 因此在統計上兩結果具有一致性。 江門微中子震盪實驗計畫在2021 年底開始採計數據，並預期五至六年的數據量能夠以3 到4 σ 的信心水準決定微中子質量順序。論文第二部分介紹26,000 隻已生產之三吋光電倍增管的工廠量測及合作組抽樣結果，其中因後脈衝而導致的抽樣不合格率達到了1%(3% 抽樣率)，而其餘較基本參數所導致的抽樣不合格率約為0.1%(10% 抽樣率)。為了與最終光電倍增管與數據採集電子學系統的整合測試相互對比，我們仍在研究之獨立測試平台目前能成功的測量增益對高壓曲線，量測單光電子解析度，以及單光電子的時間傳遞飄移。對比光電倍增管工廠所給出的出廠參數，測試平台給出的結果並無相互牴觸。 | zh_TW |
| dc.description.abstract | There’re two parts in this thesis, one is using a channel different from the past to analyize neutrino oscillation mixing angle θ13 in DayaBay experiment, the other focus on characterizations of 3 inches photomultiplier tubes in Jiangmen Underground Neutrino Observatory(JUNO) experiment. In 2012, DayaBay collaboration published the first 5 σ measurement of neutrino oscillation mixing angle θ13, which established the truth of non-zero value of θ13. The updated results in 2018 is still the most precise measurement so far, this measurement was done by using inverse β decay followed by neutron-Gadolinium capture signal. Distinct with previous analysis, we’re doing the measurement of θ13 by using the same decay but followed by neutron-Gadolinium, neutron-Hydrogen, and trace neutron-Carbon capture signal, the result sin2 2θ13 = 0.077±0.0070(Stat)±0.0047(Syst) again shows non-zero value of θ13 in 9.1 σ of confidence level. The 1.02 σ difference between our result and current precisest result are consistent with each other in statistics. JUNO experiment plans to start taking data in late 2021, and expects to determine the mass hierarchy in 3 or 4 σ of confidence level with five or six years amount of data. The second part of thesis introduces the vendor qualities and acceptance sampling test of 26,000 3 inches photomultiplier tubes which already been produced. Among the sampling, there’re 1% failure rate due to large after pulses (in 3% sampling rate), and 0.1% failure rate for the other basic quantities (in 10% sampling rate). To cross check the final integration test of tubes and data acquisition electronics combined together, the independent test bench, developed in National Taiwan University, now can successfully measure the gain curve, single photo-electron resolution, and single photo-electron transit time spread. These results are quite promising in compare with the data sheets provided by company. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-16T06:30:20Z (GMT). No. of bitstreams: 1 U0001-2307202016213600.pdf: 19556251 bytes, checksum: b405c8676354dd1b47d9f70d4086dba5 (MD5) Previous issue date: 2020 | en |
| dc.description.tableofcontents | 誌謝iii 摘要v Abstract vii 1 Introduction 1 1.1 Brief history of neutrinos . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1.1 Idea and discovery of neutrinos . . . . . . . . . . . . . . . . . . 1 1.1.2 Confirmation of neutrino oscillation . . . . . . . . . . . . . . . . 5 1.2 Neutrino oscillation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.2.1 Physics behind neutrino oscillation . . . . . . . . . . . . . . . . 7 1.2.2 Neutrino survival probability . . . . . . . . . . . . . . . . . . . . 8 1.3 Oscillation experiments . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 1.3.1 Solar neutrino experiments . . . . . . . . . . . . . . . . . . . . . 10 1.3.2 Atmosphere neutrino experiments . . . . . . . . . . . . . . . . . 11 1.3.3 Reactor neutrino experiments . . . . . . . . . . . . . . . . . . . 12 1.3.4 Accelerator neutrino experiments . . . . . . . . . . . . . . . . . 16 2 DayaBay experiment 21 2.1 DayaBay experiment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2.1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2.1.2 Experiment layout . . . . . . . . . . . . . . . . . . . . . . . . . 21 2.1.3 Strategy of θ13 measurement . . . . . . . . . . . . . . . . . . . . 23 2.2 Anti-Neutrino detector system . . . . . . . . . . . . . . . . . . . . . . . 26 2.2.1 Anti-neutrino detector . . . . . . . . . . . . . . . . . . . . . . . 26 2.2.2 Muon veto system . . . . . . . . . . . . . . . . . . . . . . . . . 29 2.2.3 Electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 2.2.4 Triggers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 2.3 Calibrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 2.3.1 Timing calibration . . . . . . . . . . . . . . . . . . . . . . . . . 32 2.3.2 Energy calibration . . . . . . . . . . . . . . . . . . . . . . . . . 32 2.3.3 Energy resolution . . . . . . . . . . . . . . . . . . . . . . . . . . 42 2.3.4 Absolute anti-neutrino energy . . . . . . . . . . . . . . . . . . . 42 3 Unified analysis in DayaBay 47 3.1 Inverse β decay(IBD) event . . . . . . . . . . . . . . . . . . . . . . . . . 47 3.1.1 IBD events in unified analysis . . . . . . . . . . . . . . . . . . . 47 3.1.2 Construction of detection efficiency . . . . . . . . . . . . . . . . 54 3.1.3 Muon veto efficiency ϵμ . . . . . . . . . . . . . . . . . . . . . . 56 3.1.4 Multiplicity cut efficiency ϵm . . . . . . . . . . . . . . . . . . . 57 3.1.5 Prompt energy cut efficiency ϵEp . . . . . . . . . . . . . . . . . . 59 3.1.6 Capture time efficiency ϵdT . . . . . . . . . . . . . . . . . . . . . 61 3.1.7 Delayed energy cut efficiency ϵEd . . . . . . . . . . . . . . . . . 65 3.1.8 Distance cut efficiency ϵdr . . . . . . . . . . . . . . . . . . . . . 69 3.2 Backgrounds estimations . . . . . . . . . . . . . . . . . . . . . . . . . . 73 3.2.1 Accidental pairs . . . . . . . . . . . . . . . . . . . . . . . . . . 73 3.2.2 Cosmogenic isotopes: 9Li 8He . . . . . . . . . . . . . . . . . . 78 3.2.3 Fast Neutron . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 3.2.4 241Am13C neutron background . . . . . . . . . . . . . . . . . . . 94 4 Statistical estimation of oscillation mixing angle θ13 101 4.1 Construction and validation of θ13 estimator . . . . . . . . . . . . . . . . 101 4.1.1 χ2 fitter construction . . . . . . . . . . . . . . . . . . . . . . . . 101 4.1.2 Predicted νe rate calculation . . . . . . . . . . . . . . . . . . . . 103 4.1.3 Fitter validation . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 4.2 Final results of θ13 estimation in unified analysis . . . . . . . . . . . . . 118 4.2.1 Summary of signal candidates, background, and efficiencies . . . 118 4.2.2 Summary of systematics . . . . . . . . . . . . . . . . . . . . . . 119 4.2.3 Results of θ13, Anorm(reactor neutrino anomaly) . . . . . . . . . . 121 4.3 Appendix: List of fitted parameters . . . . . . . . . . . . . . . . . . . . 126 4.3.1 θ13 fitter validation by using the numbers of nGd analysis in PRD paper[42] . . . . . . 126 4.3.2 θ13 fitting in unified analysis . . . . . . . . . . . . . . . . . . . . 129 5 Characterization of 3 inches photomultiplier tubes(sPMT) in Jiangmen Underground Neutrino Observatory(JUNO) 133 5.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133 5.1.1 Motivation of JUNO experiment . . . . . . . . . . . . . . . . . . 133 5.1.2 Experiment site . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 5.1.3 JUNO detector . . . . . . . . . . . . . . . . . . . . . . . . . . . 137 5.2 3 inches photomultiplier tubes(sPMT) in JUNO . . . . . . . . . . . . . . 140 5.2.1 sPMT production and bare tubes acceptance test . . . . . . . . . 140 5.2.2 Build up of sPMT fine test bench . . . . . . . . . . . . . . . . . 147 5.3 JUNO status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158 6 Conclusions and prospects 161 Bibliography167 | |
| dc.language.iso | en | |
| dc.title | 以大亞灣實驗之中子捕捉信號量測微中子震盪混合角θ13 江門微中子實驗中心探測器之三吋光電倍增管的特性測試 | zh_TW |
| dc.title | Measurement of neutrino oscillation mixing angle θ13 via unified neutron capture in DayaBay experiment Characterization of 3 inches photomultiplier tubes in JUNO central detector | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 108-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 張寶棣(Pao-Ti Chang),林貴林(Guey-Lin Lin),王正祥(Cheng-Hsiang Wang) | |
| dc.subject.keyword | 大亞灣實驗,江門地下微中子觀測站,微中子,微中子震盪,震盪混合角θ13,微中子質量順序,光電倍增管, | zh_TW |
| dc.subject.keyword | DayaBay experiment,JUNO experiment,neutrino,neutrino oscillation,oscillation mixing angle θ13,neutrino mass hierarchy,photomultiplier tube, | en |
| dc.relation.page | 171 | |
| dc.identifier.doi | 10.6342/NTU202001790 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2020-08-18 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 物理學研究所 | zh_TW |
| 顯示於系所單位： | 物理學系 | |
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