the sudbury neutrino observatory plus liquid scintillator ... · 29.10.2010, belina von krosigk sno...
TRANSCRIPT
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 1
The Sudbury Neutrino Observatory plus Liquid Scintillator Project
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 2
● SNO+ Detektor im SNOLAB
● Physikalische Ziele- Geo-Neutrinos- Reaktor Neutrinos- Supernova Neutrinos- Neutrinoloser Doppelter Beta-Zerfall- Niederenergetische Solare Neutrinos- ...
● Status
Überblick
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 3
● SNO+ Detektor im SNOLAB
● Physikalische Ziele
● Status
Überblick
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 4
Detektor und Untergrundlabor
~ 2 km (~ 6000 mwe) tief in der „Vale INCO Ltd.“ Creighton Mine,
Greater Sudbury, Ontario
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 5
SNOLAB
SNO+
DEAP-1
Picasso-II
Picasso-IIB ?
EXO-200-Gas ? SuperCDMS ?
MiniCLEAN
DEAP/CLEAN 3600
HALO
alle Labore Reinraumklasse < 2000
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 6
SNOLAB
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 7
SNOLAB
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 8
SNO Detektor
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 9
SNO Detektor
~ 12 m
~ 18 m
22 m
34 m
PMT Support Structure (PSUP)
Acrylic Vessel(AV)
~ 9500 PMTs(Ø 20 cm)
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 10
SNO Detektor
~ 1 kt D2O
~ 7,4 ktultra-pure H2O
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 11
SNO+ Detektor
~ 1 kt LiquidScintillator
~ 1 t natNd(≙ 56 kg 150Nd)
~ 7,4 ktultra-pure H2O
AV HoldDown Ropes
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 12
SNO+ Detektor
~ 1 kt LiquidScintillator
~ 1 t enrNd(≙ 500 kg 150Nd)
~ 7,4 ktultra-pure H2O
AV HoldDown Ropes
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 13
Flüssigszintillator in SNO+
● Flüssigszintillations-Detektoren haben schwache Energieauflösung, aber
● großer Isotop-Anteil möglich (Statistik)
● geringer Untergrund (wenig versch. Materialien, Selbst-Abschirmung)
● Phase mit und ohne Quelle möglich
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 14
Flüssigszintillator in SNO+
● Lösungsmittel: Linear Alkylbenzene (LAB, ~ 99,6%)
● Szintillator: 2,5-Diphenyloxazol (PPO, ~ 0,3%)
● ββ Isotop: Neodym 150Nd (Nd, ~ 0,1%)
C15H11NO
C H
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 15
● SNO+ Detektor im SNOLAB
● Physikalische Ziele
● Status
Überblick
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 16
Physikalische Ziele
● Geo-Neutrinos
● 240 km Baseline Reaktor Neutrino Oszillationen(LMA Bestätigung)
● Supernova Neutrinos
● neutrinoloser doppelter Beta-Zerfall
● niederenergetische solare Neutrinos (pep, CNO)
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 17
Geo-Neutrinos
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 18
Geo-Neutrinos
● aus β-Zerfällen in Erdkruste und -mantel (va. aus 232Th-, 238U-Zerfallsreihen)
● bieten Möglichkeit gesamte Wärme aus radioaktiven Zerfällen in Erde zu messen
50%-100% des totalen Wärmefluss der Erde
_ν
e
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 19
Geo-Neutrinos
● Geo-Neutrino Ereignis: + p → e+ + n
● Erwartete Ereignisrate: 44 Ereignisse pro a (1000 CH2) / 38 Reaktor-Ereignisse
● Geo-Neutrino Signal und Reaktor Untergrund:
_ν
e
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 20
Reaktor Neutrinos
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 21
0 2 4 6 Enu [MeV]
Reaktor Neutrinos
● Reaktor Neutrino Ereignis: + p → e+ + n
● Reaktoren: Bruce (240 km), Pickering (340 km), Darlington (360 km)
● Pee(E):
_ν
e
240 km
340 km
360 km
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 22
Reaktor Neutrinos
„Spectral Distortion“ durch Neutrino Oszillation (LMA)
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 23
Reaktor Neutrinos
LMA Oszillations Maximum außerhalb Geo-Neutrino Spektrum
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 24
Supernova Neutrinos
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 25
Supernova Neutrinos
● >99% der Energie in Typ II SN in Form von ν (ν) freigesetzt
● Reaktionen in SNO+ für eine 3x1053 erg SN, 10 kpc entfernt:
_
ES:
CC:
NC:
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 26
Neutrinoloser Doppelter Beta-Zerfall
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 27
Neutrinoloser Doppelter Beta-Zerfall
● doppelter Beta-Zerfall: (A, Z) → (A, Z + 2) + 2e- + 2
● neutrinoloser doppelter Beta-Zerfall: (A, Z) → (A, Z + 2) + 2e-
_ν
e
nur möglich, wenn Neutrino massive Majorana-Teilchen
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 28
Neutrinoloser Doppelter Beta-Zerfall
Spektrum des Doppelten Beta-Zerfalls (idealisiert)
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 29
Neutrinoloser Doppelter Beta-Zerfall
Überlagerung von 2ν- und 0ν- Signal durch Energie-Auflösung
Review by Elliott and Vogelhep-ph/0202264
Auflösung
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 30
Warum eigentlich Neodym?
(J.J. Gómez-Cadenas et al., arXiv:1010.5112v1, (2010))
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 31
Neutrinoloser Doppelter Beta-Zerfall
SNO+ Doppel Beta-Spektrum (0,1% enrNd)
1 yr, 500 kg 150Nd, mv = 150 meV
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 32
Neutrinoloser Doppelter Beta-Zerfall
SNO+ Nachweisempfindlichkeit aus Statistik
2ν/0ν Zerfallsraten aus Elliott & Vogel, Ann. Rev. Nucl. Part. Sci. 52, 115 (2002)
Neu
trin
o M
ass
e [
meV
]
Neu
trin
o M
ass
e [
meV
]
Minimale Majorana Masse bei der 0νββ messbar ist
500 kg 150Nd 56 kg 150Nd
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 33
Niederenergetische Solare Neutrinos
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 34
Solare Neutrinos (pep, CNO)
Kleine theoretische Einführung...
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 35
Solare Neutrinos (pep, CNO)
derzeit: Oszillationen von 3 aktiven massiven ν sind dominanter Effekt
leptonische Mischung wennFlavour-Eigenzustände ≠ Massen-Eigenzustände:
Pontecorvo-Maki-Nakagawa-Sakata Matrix
für 2-ν-Oszillation in Vakuum: ≈
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 36
Solare Neutrinos (pep, CNO)
Materie- oder MSW-Effekt(Mikheyev, Smirnov, Wolfenstein)
Hamiltonian für νe-Ausbreitung in
Materie:
=> in Oszillations-Wahrscheinlichkeit P:
extra Term wegen zusätzlicher Wechselwirkung der νe über W mit den e-
in Sonne und Erde
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 37
Solare Neutrinos (pep, CNO)
Materie-Vakuum-Übergang (LMA)
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 38
Warum pep Neutrinos?
● pep Neutrinos: Eν = 1.44 MeV
● SSM pep Fluss: Unsicherheit ±1,5%
Gallium Chlorine Water
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 39
pep Neutrinos
Materie-Vakuum-Übergang (LMA)
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 40
pep Neutrinos...
… und θ13
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 41
pep Neutrinos... Neue Physik?
„Mass-Varying Neutrinos“
Fardon, Nelson, Weiner(hep-ph/0309800):Kopplung von ν mit skalaremFeld führt zu ν deren Massemit dem Hintergrund-Feldvariiert (z.B. von anderen ν)
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 42
pep Neutrinos
Kosmogener Untergrund 11C
Bilder: KamLAND Proposal
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29.10.2010, Belina von Krosigk SNO plus Liquid Scintillator Project 43
Solare Neutrinos (pep, CNO)
● Solares Neutrino Ereignis: νe+ e- → ν
e + e-
bei 3 Jahren Datennahme
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Proton-Zerfall?, Pauli-Exclusion-Principal?, ...
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● SNO+ Detektor im SNOLAB
● Physikalische Ziele
● Status
Überblick
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Day Zero
Tue 8/7/12
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Neodym-LS Synthese
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Muon Fluss
Variation of the flux of cosmic-ray muons with overburden