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奇怪的隱形人 ---- 微中子簡介 An Introduction to Neutrino High School Seminar at NTHU July 9, 2007 張維甫 We-Fu Chang.

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Presentation on theme: "奇怪的隱形人 ---- 微中子簡介 An Introduction to Neutrino High School Seminar at NTHU July 9, 2007 張維甫 We-Fu Chang."— Presentation transcript:

1 奇怪的隱形人 ---- 微中子簡介 An Introduction to Neutrino High School Seminar at NTHU July 9, 2007 張維甫 We-Fu Chang

2 WF ChangNTHU, July 9, 20072 這個世界是用什麼做的?

3 WF ChangNTHU, July 9, 20073

4 WF ChangNTHU, July 9, 20074

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6 WF ChangNTHU, July 9, 20076

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8 WF ChangNTHU, July 9, 20078

9 WF ChangNTHU, July 9, 20079 追尋更基本的結構

10 WF ChangNTHU, July 9, 200710

11 WF ChangNTHU, July 9, 200711

12 WF ChangNTHU, July 9, 200712

13 WF ChangNTHU, July 9, 200713

14 WF ChangNTHU, July 9, 200714 我們對基本元素的認識

15 WF ChangNTHU, July 9, 200715 今天我們知道的基本粒子 微中子

16 WF ChangNTHU, July 9, 200716 微中子的發現 N P + electron 電子的動能應該 只有一個值呀?

17 WF ChangNTHU, July 9, 200717  動量守恆 = 空間平移 不變  能量守恆 = 時間平移 不變  Niels Bohr 甚至建議 動 能量在次原子尺度 並不 守恆

18 WF ChangNTHU, July 9, 200718 W. Pauli’s proposal  1930  在衰變末態另有一個  電中性  自旋 ½  質量小於 0.01 M  Pauli 命名為 Neutron p

19 WF ChangNTHU, July 9, 200719

20 WF ChangNTHU, July 9, 200720  1932, J. Chadwick discovered neutron which is too heavy for Pauli’s particle

21 WF ChangNTHU, July 9, 200721 E. Fermi’s interaction  1933 重新命名為 微 中子 ( Neutrino )

22 WF ChangNTHU, July 9, 200722  微中子和物質發生作用的散射截面 積實在太小了  需要 100 光年厚的鉛塊才能檔下來

23 WF ChangNTHU, July 9, 200723 1956 C. Cowen, F. Reines

24 WF ChangNTHU, July 9, 200724 歷史上第一張微中子的照片

25 WF ChangNTHU, July 9, 200725 只有左手的弱作用力

26 WF ChangNTHU, July 9, 200726

27 WF ChangNTHU, July 9, 200727  由 Z Boson 消失 的衰變, 我們可以 推測一共有三種 微中子.

28 WF ChangNTHU, July 9, 200728 我們的太陽

29 WF ChangNTHU, July 9, 200729 太陽核心的核反應鏈

30 WF ChangNTHU, July 9, 200730

31 WF ChangNTHU, July 9, 200731

32 WF ChangNTHU, July 9, 200732 太陽的結構

33 WF ChangNTHU, July 9, 200733 日震學

34 WF ChangNTHU, July 9, 200734 太陽微中子

35 WF ChangNTHU, July 9, 200735

36 WF ChangNTHU, July 9, 200736 Super Kamiokande

37 WF ChangNTHU, July 9, 200737

38 WF ChangNTHU, July 9, 200738  SuperK 看到的 高能電子

39 WF ChangNTHU, July 9, 200739 1987A

40 WF ChangNTHU, July 9, 200740

41 WF ChangNTHU, July 9, 200741

42 WF ChangNTHU, July 9, 200742 SNO

43 WF ChangNTHU, July 9, 200743

44 WF ChangNTHU, July 9, 200744

45 WF ChangNTHU, July 9, 200745

46 WF ChangNTHU, July 9, 200746 量子變身 及 測不準原理

47 WF ChangNTHU, July 9, 200747 Generalized Gravity Theories I

48 WF ChangNTHU, July 9, 200748

49 WF ChangNTHU, July 9, 200749 Cosmic Backgrond Radiation

50 WF ChangNTHU, July 9, 200750 三個微中子質 量和小於 0.7 eV

51 WF ChangNTHU, July 9, 200751 宇宙大餅

52 WF ChangNTHU, July 9, 200752

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55 WF ChangNTHU, July 9, 200755 微中子的質量特別小

56 WF ChangNTHU, July 9, 200756 輕子 / 夸克 混合角度大不同

57 WF ChangNTHU, July 9, 200757 Summary  微中子的發現  到處都是隱形的微中子 --- 微中子的特性  他們會變身 !  我們學到了什麼?還有什麼問題?  未來展望

58 WF ChangNTHU, July 9, 200758


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