Revelations of the neutrino: Mass of the neutrino (KATRIN) Christoph Wuttke, Mass of the Neutrino 1.

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Presentation transcript:

Revelations of the neutrino: Mass of the neutrino (KATRIN) Christoph Wuttke, Mass of the Neutrino 1

 Mass of the neutrino A short biography Properties Mass of the neutrino Tritium beta-decay Christoph Wuttke, Mass of the Neutrino 2 Outline

1930: Process of Beta Decay (nucleus + electron) did not match with conservation of energy, momentum and angular momentum. Wolfgang Pauli postulated a new particle to describe these problems and called it „Neutron“. 1932:James Chadwick discovered the neutral massive particel in nucleis and also named it „Neutron“. 1933: Enrico Fermi named the first „Neutron“ „Neutrino“. This confusion was only about the electron neutrino !!! Discovery: NeutrinoTheoreticalExperimental Electron1930 (Wolfgang Pauli)1956 (C.Cowan, F.Reines) MyonLate 1940s1962 (L.Lederman, M.Schwartz,J.Steinberger) TaonMid 1970s2000 (DONUT Collaboration) Christoph Wuttke, Mass of the Neutrino 3 A short biography

- Weak (and gravitational) interaction only (4*10^10) neutrinos are flying through your thumbnail every second! - Neutrino Oscillation Neutrinos can change their flavour! Christoph Wuttke, Mass of the Neutrino 4 Properties

Christoph Wuttke, Mass of the Neutrino 5 Mass of the neutrino Standard Modell: m=0 Neutrino Oscillation  nonzero mass How do you measure the mass of such a particle? The answer ist the Beta-decay (of Tritium)!

Mass of the neutrino A short biography Properties Mass of the neutrino  Tritium beta-decay Measuring the electron energy Kurie Plot Why Tritium? KATRIN experiment Christoph Wuttke, Mass of the Neutrino 6 Outline

β-spectrum: Christoph Wuttke, Mass of the Neutrino 7 Measuring the electron energy :

Christoph Wuttke, Mass of the Neutrino 8

Christoph Wuttke, Mass of the Neutrino 9 Kurie-Plot K(E) E E E

- Small decay energy (18.57 keV)  easier to detect slow electrons - Long Half-life of 12.3 years - Because of small energy  high variation in Kurie-Plot - Tritium Fermifunction  no distortion of β-spectrum Christoph Wuttke, Mass of the Neutrino 10 Why Tritium?

Mass of the neutrino A short biography Properties Mass of the neutrino Tritium beta-decay Measuring the electron energy Kurie Plot Why Tritium?  KATRIN experiment KATRIN Main spectrometer Travel of the Main spectrometer Christoph Wuttke, Mass of the Neutrino 11 Outline

(KArlsruhe TRItium Neutrino experiment) Measures the mass of the electron neutrino with a sensitivity of 0.2 eV a – Tritium source b – Transport section c – Pre spectrometer d – Electron-detector e – Main spectrometer Christoph Wuttke, Mass of the Neutrino 12 KATRIN experiment e

Christoph Wuttke, Mass of the Neutrino 13 KATRIN Main spectrometer U=18640 V

Christoph Wuttke, Mass of the Neutrino 14 Travel of the Main Spectrometer Deggendorf  Leopoldshafen  Karlsruhe

Christoph Wuttke, Mass of the Neutrino 15 Travel of the Main spectrometer (2006) Travel by sea with the Annegret Passing Jochenstein lock with a safety margin of 7 cm

Christoph Wuttke, Mass of the Neutrino 16

N.Schmitz: Neutrinophysik (Teubner 1997) Prof. Kai Zuber en.wikipedia.org/wiki/Neutrino Christoph Wuttke, Mass of the Neutrino 17 Sources

large.gif large.gif _decay_spectrum.gif _decay_spectrum.gif Christoph Wuttke, Mass of the Neutrino 18 Picture Sources