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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 王名儒(Min-Zu Wang) | |
| dc.contributor.author | Hsi-Ming Chang | en |
| dc.contributor.author | 張曦明 | zh_TW |
| dc.date.accessioned | 2021-06-13T06:04:50Z | - |
| dc.date.available | 2006-06-26 | |
| dc.date.copyright | 2006-06-26 | |
| dc.date.issued | 2006 | |
| dc.date.submitted | 2006-06-15 | |
| dc.identifier.citation | [1] H. B. Li et al., Phys. Rev. Lett. 90, 131802 (2003).
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/34361 | - |
| dc.description.abstract | In order to solve the strong CP problem, a new neutral particle with spin-parity 0^{-}, the axion, was invented. The strong CP problem is perplexing because it will manifest itself as an enormous neutron electric dipole moment: ten orders of magnitude larger than the experimental constraint. Although, from the experimental point of view, axion remains undiscovered, there is still strong interest in axions while other solutions to strong CP problem are not explicitly better. For instance, axions and weakly interacting massive
particles (WIMPs) are two leading candidates for dark matter in our universe. A search for axions in specific nuclear transitions was performed at the Kuo-Sheng Nuclear Power Plant. Because of the pseudoscalar nature of axions, they could be emitted by competing with photons via nuclear de-excitation in reactor. Similar to neutrinos, axions interact feebly with normal matter, which makes the detection of such particles difficult. A 1.06 kg high-purity germanium detector was placed 28 meters from reactor core to detect single photons produced by axion Primakoff and/or Compton conversions inside the detector. For axion-to-photon branching ratio as well as axion coupling constants, two model-independent limits have been derived at 90% confidence level. Although the g_arr limit is not as competitive as other experiments, our limit on g_aee is unique. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-13T06:04:50Z (GMT). No. of bitstreams: 1 ntu-95-R93222006-1.pdf: 3849720 bytes, checksum: a4e7b213f03360214173a307cfea3d36 (MD5) Previous issue date: 2006 | en |
| dc.description.tableofcontents | 1 TEXONO Overview .....................................1
1.1 Adopted Detectors .................................3 1.1.1 The HPGe Detector ...............................3 1.1.2 The CsI Array Detector ..........................4 1.2 Background Sources ................................5 1.3 Outer Shielding Structure ........................10 1.3.1 Cosmic-ray Veto ................................11 1.3.2 Lead, Boron-loaded Polyethylene, and Copper ....12 1.4 Electronics and Data Acquisition System ..........13 2 Introduction to Axion Physics ......................15 2.1 Strong CP Problem ................................15 2.2 Peccei-Quinn Symmetry and the Birth of Axion .....16 2.3 Invisible Axions .................................18 3 Reactor as Axion Source ............................21 3.1 Potential Axion Emission Channels ................21 3.2 Axion Decay Effect ...............................23 4 Axion Detection with HPGe ..........................25 4.1 Primakoff Conversion .............................25 4.2 Axion Compton Conversion .........................27 4.3 Matter Effect ....................................27 5 Data Analysis and Results ..........................29 5.1 Event Selection ..................................29 5.1.1 Anti-Compton Cut ...............................29 5.1.2 Cosmic-ray Cut .................................29 5.1.3 Pulse Shape Analysis ...........................31 5.1.4 Summary on Event Selection .....................32 5.2 Energy Calibration ...............................32 5.3 Simulation of Detector Effciency .................35 5.4 Results ..........................................37 5.4.1 garr and gaee Exclusion Plots ..................41 5.4.2 My Understanding in ga-ma Space ................44 6 Summary ............................................45 6.1 Global Status of garr ............................45 6.2 Global Status of gaee ............................49 6.3 Summary ..........................................50 | |
| dc.language.iso | en | |
| dc.subject | 軸子 | zh_TW |
| dc.subject | axion | en |
| dc.subject | reactor | en |
| dc.subject | axions | en |
| dc.title | 利用高純鍺探測器於國聖核電廠搜尋軸子 | zh_TW |
| dc.title | A Search for Axions at the Kuo-Sheng Nuclear Power Plant with a High-Purity Germanium Detector | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 94-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.coadvisor | 王子敬(Tsz-King Wong) | |
| dc.contributor.oralexamcommittee | 闕志鴻(Tzi-Hong Chiueh) | |
| dc.subject.keyword | 軸子, | zh_TW |
| dc.subject.keyword | axion,axions,reactor, | en |
| dc.relation.page | 53 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2006-06-16 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 物理研究所 | zh_TW |
| 顯示於系所單位： | 物理學系 | |
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