Christian Buck, MPIK Heidelberg

29
Christian Buck, MPIK Heidelberg LAUNCH 09 November, 11th 2009 The Double Chooz reactor neutrino experiment

description

The Double Chooz reactor neutrino experiment. Christian Buck, MPIK Heidelberg. LAUNCH 09 November, 11th 2009. Neutrino oscillations. sin 2 Θ 13. ν 3. sin 2 Θ 23. ν e. Δ m atm 2. ν μ. ν τ. sin 2 Θ 12. ν 2. Δ m sol 2. ν 1. Δ m sol 2 ~ 7.6∙10 -5 eV 2 , sin 2 (2 Θ 12 ) ~ 0.85 - PowerPoint PPT Presentation

Transcript of Christian Buck, MPIK Heidelberg

Page 1: Christian Buck, MPIK Heidelberg

Christian Buck, MPIK Heidelberg

LAUNCH 09

November, 11th 2009

The Double Chooz reactor neutrino

experiment

Page 2: Christian Buck, MPIK Heidelberg

Neutrino oscillations

3

2

1

321

321

321

UUU

UUU

UUU eeee

Δmsol2 ~ 7.6∙10-5 eV2, sin2(2Θ12) ~ 0.85

Δmatm2 ~ 2.4∙10-3 eV2, sin2(2Θ23) ~ 1

ν2

Δmatm2

Δmsol2

ν1

ν3

sin2Θ13

sin2Θ23

sin2Θ12

νe

νμ

ντ

E

LmPee 4

sin2sin12

13213

2

Page 3: Christian Buck, MPIK Heidelberg

Why Double Chooz?

Improved knowledge of mixing matrix

Key experiment to unveil leptonic CP violation

Discovery potential: hint given by global analysis

Fogli et al., arXiv:0905.3549 (2009)

Complementarity to beam experiments

- Degeneracies + parameter correlations

- Optimize future accelerator experiments

Discrimination power of 0νββ

Safeguard applications,…

)1(04.008.02sin 132

Page 4: Christian Buck, MPIK Heidelberg

Reactor neutrino experiments

1956: First observation (Nobel Prize 1995)

1990s: Chooz, Palo Verde (sin22Θ13< 0.2)

2002: KamLand

Δm12, Θ12

Reactor neutrinos: Pure νe - beam Intense flux (~2% precision) Detection: inverse β-decay Energy: few MeV

Page 5: Christian Buck, MPIK Heidelberg

Double Chooz collaboration

Spokesman: H. de Kerret (APC) France: CEA Saclay, APC Paris, Subatech Nantes, IPHC Strasbourg Germany: MPIK Heidelberg, TU München, EKU Tübingen, Universität Hamburg,

RWTH Aachen USA: Univ. of Alabama, Argonne Nat. Lab., Chicago, Drexel, Kansas State, LLNL,

Notre Dame, Tennessee, Columbia Univ., Davis, MIT, Sandia Spain: CIEMAT Madrid Japan: Tohoku University, Kobe University, Tokyo Inst. of Tech., Niigata

University, Tokyo Metropolitan University, Hiroshima Inst. of Tech. England: University of Sussex Russia: RAS Moskau, Kurchatov Institute Brasil: CBPF Rio de Janeiro, UNICAMP

Page 6: Christian Buck, MPIK Heidelberg

The Double Chooz principle

Page 7: Christian Buck, MPIK Heidelberg

Survival probability

G. Mention (APC)

Dnear Dfar

E

Lm

E

LmPee 4

sin2sincos4

sin2sin12

12212

213

42

13213

2

Survival probability assuming sin2(2Θ13) = 0.2 for different Δm13

Page 8: Christian Buck, MPIK Heidelberg

Current proposals

Angra

Double-Chooz

KaskaDaya bay

RENO

Page 9: Christian Buck, MPIK Heidelberg

Neutrino signal

n

ep

511 keV511 keV e+

~ 8 MeV

Gd

Target: Gadolinium loaded liquid scintillator

Neutrino rates: - far: ~50/day- near: ~300/day

235U

ββ

236U

n pure e source

Eν ~ MeV

Emin ~ 1.8 MeV

> 1020 /(s∙GW) Chooz: ~ 7.4 GWth

prompt

delayed (30 µs)

Page 10: Christian Buck, MPIK Heidelberg

Background

Accidentals

n

~ 8 MeV

+

E ≥ 1 MeV

Gd

n

~ 8 MeV

Gd

fast neutrons

β-n-cascades: 9Li,8He

Chooz data:

far detector: ca. 1.4/day

Long lived!

Page 11: Christian Buck, MPIK Heidelberg

Detector Design

TARGET (2.3m)- Acrylic vessel (8mm)- 10,3 m3 LS (1 g/l Gd)

γ-catcher (0.55m) - Acrylic vessel (12mm)

- 22,6 m3 LS

Buffer (1.05m) -Steel (3 mm)- 110 m3 oil

Inner Veto (0.5m) -Steel (10 mm)

- 80 m3 LS

7m

Page 12: Christian Buck, MPIK Heidelberg

Calibration systems

Target

GC

Buffer

Articulated arm

z-axis system (glove box)

Guide tube / wire sources

LED system / multi-wavelength

Buffer tube

Page 13: Christian Buck, MPIK Heidelberg

Comparison with Chooz

Fehler Chooz DC

Statistical 2.8% 0.4%

Flux, σ 1.9 % <0.1 %

E/fission 0.6 % <0.1 %

power 0.7 % <0.1 %

# protons 0.8 % 0.2 %

Det.eff. 1.5 % 0.5 %

Σ System. 2.7 % ~ 0.6%

Best limit: CHOOZ

sin2(2θ13) < 0.15 (90% CL)

for m2atm = 2.5·10-3 eV2

R = 1.01 2.8%(stat) 2.7%(syst)

Reactor

Detector

Page 14: Christian Buck, MPIK Heidelberg

Sensitivity

2010

Sensitivity 2010 – 2015 (near detector starts < 2 y after far) for m2

atm = 2.8·10-3 eV2

Far detector filling early 2010!

Page 15: Christian Buck, MPIK Heidelberg

Far detector installation

Lab cleaning

Installation Veto and Veto-PMTs Installation Buffertank

Page 16: Christian Buck, MPIK Heidelberg

PMT installation

Page 17: Christian Buck, MPIK Heidelberg

Acrylic vessel installation

Arrival Gamma Catcher on-site Acrylic vessels in lab

Gamma Catcher installationGamma Catcher transport

christian
Page 18: Christian Buck, MPIK Heidelberg

Status October ‘09

Page 19: Christian Buck, MPIK Heidelberg

Status near detector

Tunnel (155 m), 12%

Site engineering study completed excavate 2010

r = 415 m (115 m w.e.)

Myons (Veto): 250 Hz reactors

near detector

LaboratoryOpen ramp (85 m), 14%

Liquid storageData taking: 2011

Page 20: Christian Buck, MPIK Heidelberg

Scintillator development (MPIK)

Requirements:

Gd-solubility > 1 g/l

Stability (5 years)

Transparency

Material compatibility

Radiopurity

Target – Gamma catcher matching (optics + density)

Large scale (multi tons)

Light yield

PXE conc,

PPO conc.

Page 21: Christian Buck, MPIK Heidelberg

Scintillator properties

400 420 440 460 480 500 520 540 560 580 6000,000

0,005

0,010

0,015

0,020

0,025

0,030

2.5m

5m

abso

rban

ce (1

0 cm

cel

l)

wavelength [nm]

30Aug2006 04Feb2009

10m

Target

Gamma Catcher candidates

Event localization by pulse shape analysis

Transparency in ROI stable in 10 m range!

Time [ns]

Eve

nts

Page 22: Christian Buck, MPIK Heidelberg

All components (40 tons) delivered to MPIK Purifications finalized, prepare for mixing Scintillator production starts

Large scale production

Page 23: Christian Buck, MPIK Heidelberg

PMT activities at MPIK

Testing / Calibration Assembly / Installation Implementation of data in Double Chooz software Current upgrade: full detector segment

Page 24: Christian Buck, MPIK Heidelberg

PMT calibration

Calibration program: HV scans Single photon electron (P/V) Transit time Dark rate Quantum efficiency

Page 25: Christian Buck, MPIK Heidelberg

Summary

Goal of Double Chooz reactor neutrino experiment: Determination of mixing angle Θ13 (sin2(2θ13) ~ 0.03)

2-detector concept to reduce systematical error

Detection via inverse β-decay in Gadolinium loaded liquid scintillator

Schedule:

– Data taking far detector: Spring 2010

– Near detector: end of 2011

MPIK: scintillators, PMTs, Analysis

Page 26: Christian Buck, MPIK Heidelberg

Θ13 and 0νββ

Normal hierarchy: discrimination power of 0νββ-exp. depends on sin2(2Θ13) !

M.Lindner, A.Merle, W.Rodejohann, Phys.Rev.D73:073012 (2006)

Page 27: Christian Buck, MPIK Heidelberg

Positron spectrum

Far/Near ratio

sin2(213)=0.12

e+ spectrum

Far DetetectorStat. Errors

Page 28: Christian Buck, MPIK Heidelberg

Sensitivity (rate vs shape)

Page 29: Christian Buck, MPIK Heidelberg

Robustness