solar neutrino results from phase iii of the sudbury ... · solar neutrino results from phase iii...
TRANSCRIPT
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Solar Neutrino Results from Phase III ofthe Sudbury Neutrino Observatory
Alan PoonBerkeley Lab
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Solar Neutrinos
Bahcall et al.
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Solar Neutrino Problem (~Y2K)
• Deficits were seen in all terrestrial solar ν detectors(which were sensitive primarily to νe).
SSM Prediction
Gallium Chlorine
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Image courtesy National Geographic
Sudbury Neutrino Observatory (SNO)
1 kt D2O
Nucl. Inst. Meth. A449, 127 (2000)
1700 tinner shielding H2O
12.01m dia.acrylic vessel
17.8m dia.PMT support structure9456 20-cm PMTs;56% coverage
5300 t outer shielding H2O
2 km to surface
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Detecting ν at SNO
NC xxνν ++→+ npd
ES -- +→+ eνeν x x
CC -epd ++→+νe p
• Low Statistics• σ(νe) ≈ 6 σ(νµ) ≈ 6 σ(ντ)• Strong directionality:
• Measurement of νe energy spectrum• Weak directionality:
• Measure total 8B ν flux from the sun• σ(νe) = σ(νµ) = σ(ντ)
1! 0.340cos"
!
"e #18 o (Te = 10 MeV)
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“Smoking gun” for flavor transformation
CC
NC=
!e
!e+ !µ +!"
CC
ES=
!e
!e+ 0.15(!µ + !" )
Does the total flux of solar neutrinos equal the pure νe flux?
!CC("e ) < !
NC("x )
!CC("e ) < !
ES("x )
Transformation to anotheractive flavor if:
Measure:
Alternatively…
Flavor transformation can be demonstrated without any assumption on theStandard Solar Model prediction of the total neutrino flux.
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SNO Phase I: Pure Heavy Water
• Pure D2O target - Ended May 2001– n + 2H → 3H + γ(6.25 MeV)– Low neutron detection efficiency (~14%)
3H
2H+n 6.25 MeV
σ = 0.5 mb
Max. Likelihood Fit
!
" CC " NC " ES
!
"e"µ#
OR
• assumed an undistorted8B spectrum; but neutrinooscillation can have energydependence
• a null hypothesis test
• large NC uncertaintieswhen the energy constraintis removed
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NC: multiple eCC, ES: single isotropy
SNO Phase II: Salt
Phase II (D2O + 2 tonnes NaCl) - Ended Sep. 2003– n + 35Cl → 36Cl + γʼs(ΣEγ=8.6 MeV)– High neutron detection efficiency (~41%)
36Cl
35Cl+n 8.6 MeV
σ = 44 b
• use of light isotropy removedassumption of 8B shape inphysics extraction
• total NC flux uncertainty ~8.4%
• Strong CC-NC anti-correlation(-0.52)
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Phase III : 3He counters
n + 3He → t + p + 764 keV σ = 5330 b εn = 21 %3He
4HeNCD
Salt3He counters
1999 2000 2001 2002 2003 2004 2005 20061990
D2OConstruction / com.
D2OCom.
np
t
• Different systematics• Reduce CC-NC correlation• Better CC flux measurement
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SNO Detector: Current Status
since 28th November, 2006
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Getting the Last Drop of DGetting the Last Drop of D22OO
The acrylic vessel was completely emptied at14:45 (Sudbury time) on 28th May, 2007.
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Raw Ni
360 µm Ni wall
3He-CF4
Anchor line
Cu anode wire
Fused silicaconnector
Delay line
9-11 m
NCD StringEnd cap
AluminiummandrelU, Th carbonyls
Ni(CO)4
50 C at pressure
175C
Ni + 4CO ↔ Ni(CO)4
• High purity CVD nickel
• ~1/100 × background ofpreviously cleanest PC
Chemical Vapor Deposition(CVD)
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NCD DeploymentNCD
Anchor block
NCD
ROV
Anchorball
ROV ball
AV
ROV
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360 µm Ni wall
3He-CF4
Anchor line
Cu anode wire
Fused silicaconnector
Delay line
NCD String
Digital scopes → trigger on amplitudeslow readout (8B neutrino)
Shaper-ADCs → trigger on integral chargefast readout (8B, SN)
Digital oscilloscope
Shaper-ADC
CurrentPreamp
NCD
Multiplexer
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360 µm Ni wall
3He-CF4
Anchor line
Cu anode wire
Fused silicaconnector
Delay line
1.5
1.0
0.5
0.0
-0.5
86420
Neutron
Cur
rent
Time (µs)
NCD Signals
20
15
10
5
0
5 4 3 2 10
Alpha
Cur
rent
Time (µs)
α
np
t
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Energy (MeV)
Po alphas
Shaper-ADC360 µm Ni wall
3He-CF4
Anchor line
Cu anode wire
Fused silicaconnector
Delay line
Energy (MeV)
t
n
p
n
Neutrino data
Neutron
n
p
t191 keV
573 keV764 keV
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Optics
Calibrations
Source
Ropes
Source-manipulator systemcapable of 2-5 cm positional accuracy
PMT NCDSource
Laserball 337-619 nm
16N 6.13 MeV γ
8Li e- spectrum
AmBe n
252Cf n
24Na n
Th low E γ
Rn low E γ
Energy
Neutron eff.
Bkgrd.PDFs
Distributed source
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Optical Calibration
Detector x (cm)
1 / (
rel.
PM
T oc
cupa
ncy)Det
ecto
r y (c
m)
Laserball runs
NCD
PMTs
x
y
PMTs
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Energy Calibration - PMTT e
ff (da
ta /
MC
)
T eff (
data
- M
C) /
Dat
a)ρ = (r/600)3
Salt phase NCD phase
ρ = (r/600)3
• ΔE/E = 1.1%• Position and energy resolutions are comparable to the salt phase
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Neutron Calibration24Na method Monte Carlo method
Mimic the signal with mixed 24Na,which generates neutrons by γ + 2H → n + p
Calibrate the Monte Carlo with point AmBe and 252Cf sources
εn = 0.211 ± 0.007 εn = 0.210 ± 0.003
24Na mixingin the heavy water
Typical source run locations ( )
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24Na Mixing
2005 injection points2006 injection point
24Na mixing during the 2006 spike
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Gammas
-600 0 6000.6
0.0
1.4
Afterinjection
Mixing
Steadystate
x (cm)
Neutrons
0.6
0.0
1.4
0.6
0.0
1.4
Ratio of 2006 to 2005
24Na Mixing
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Neutron Backgrounds
NCD Ni PD
Cable PD
n
n
n
n
n
Acrylic vessel
Hot spot PD
D2O PD
(α, n)
Hotspots
K2K5
z (cm) z (cm)
NCD
( PD = photodisintegration )
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Instrumental Background Cuts• Time domain cuts• Frequency domain cuts• Burst cuts
1 3 5 7
0
Time (µs)
Cur
rent
(µA
)0 4 8 12
Time (µs)
0
Cur
rent
(µA
)
Energy spectrum before and after cuts
Energy (MeV)
Raw shaper spectrumShaper and scope triggerAfter instrumental cuts
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Instrumental Backgrounds
3He
Hot spotGas leak into counter inter-spaceElectrical disconnectElectrical micro-discharge
4He
Gain instability
Energy (MeV)
Energy (MeV)
J3-like
N4-like
Low energy cut
Electrical micro-discharge
Neutron peak
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Problems with Other Strings
3He
4He
Electrical disconnect
NCD string number
P
Resistive coupler
Anode wire
Hot spotGas leak into counter inter-spaceElectrical disconnectElectrical micro-dischargeGain instabilities
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Simulating an NCD Pulse
Proton
Triton
Time (ns)
Energy deposition, electron drift
Time (ns)
Noise
Pulse simulation : α energy loss, α straggling, α multiple scatteringelectron-ion pair generationelectron drift, diffusionelectron multiple scatteringion mobilityelectron avalanchespace chargesignal generation, electronics, noise
Charge multiplication, ion drift,pulse propagation, electronics
Time (ns)
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Comparisons with Data
Monte Carlo
Energy (MeV)Energy (MeV)
Data
Pul
se w
idth
(ns)
Pul
se w
idth
(ns)
Endcap Po αsNeutronsWall U/Th αsWire U/Th αsWall Po αsWire Po αs
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Blind dataTotal alphas
Po alphasU alphas
Th alphas
Alpha Pulse SimulationEnergyWidth Kurtosis
Energy (MeV)FWHM Kurtosis
• Relative contributions of U, Th and Po alphas fit usingdata above the neutron (signal) energy window.
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Alpha Energy Spectrum
Po α depth Bulk α depth Electron drift SC gradient
SC offset Po/bulk α fraction Ion mobility Instrumentalcuts
Energy
(Fsy
s-F C
V) /
Fsy
s
0.4 1.4-0.5
0.5
Relative contributionsof these different systematics are constrained by the neutrino data
Po U/Th Total
Energy0.4 1.4
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Blind Analysis
• First month of neutrino data open
• Then only 20% open to Dec. 2005 tofinalize instrumental background cuts(instrumental cut bias)
• Thereafter include hidden fraction ofneutrons that follow muons (changeS/B ratio)
AND
• Omit an unknown fraction ofcandidate events (change S/B ratio)
Detailed internal documentation,review by “topic committees”
Box Opened May 2, 2008
EADC (MeV)
Un-blindBlind
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Neutrino Signal Extraction
• PDFs and observables• Systematic uncertainties• Backgrounds
Live time 385.17 daysNCD raw triggers 1,417,811 PMT raw triggers 146,431,346NCD υ candidates 7,302 PMT υ candidates 2,381
62-parameter likelihood function - 13 CC flux energy bins - 13 ES flux energy bins - NC flux - 35 systematic parameters
3 independent algorithms to determine the neutrino fluxes
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Markov Chain Monte Carlo (MCMC)
1.2 1.3 1.4 1.5 1.6 Flux
No.steps
A posterior distribution
Try to sample parameter space(instead of a 62-parameter MINUIT fit)
Initial step iparameter guesses picalculate likelihood Li
Add random amounts to all pi:pi+1 = pi + Norm(0,σi)calculate likelihood Li+1
if ( Uniform(0,1) > min(1,Li/Li+1) ):keep pi+1
else: keep pi ; start again
Metropolis-Hastings method
After “burn-in” the start point isforgotten and the algorithm samplesthe function correctly.
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Systematics Table
NC Detection efficiencyNCD energy resolutionNCD alpha backgroundNeutron background
3.3%2.7%2.7%2.3%
CC PMT energy scalePMT radial scale
2.7%2.7%
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Opening the Box
ES 5th energy bin posterior
Before fix
After fix
Post box opening : (1) 10% difference in NC fluxuncertainty between analyses (2) MCMC ES flux low by 0.5 σ
Three algorithms :• Markov Chain Monte Carlo (MCMC)• Maximum Likelihood with randomly sampled systematics• Maximum Likelihood with floating and shift-re-fit systematics
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Results
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Compare to Salt Phase
CCESNC
1.00 0.24 1.00 -0.19 0.02 1.00
CC ES NC
NCD
CCESNC
1.00 -0.16 1.00 -0.52 -0.06 1.00
CC ES NC
Salt
CC
NC
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Comparisons
ES
Flux (x 106 cm-2 s-1)
CC
Flux (x 106 cm-2 s-1)
NCD (385 d) NCD (385 d)
SuperK (1496 d)
D2O con. (306 d)
Salt (391 d)
Salt (391 d)
D2O con. (306 d)
Statistical unc.Total unc.
CC 1.67 (stat) (sys) × 106 υ cm-2s-1
ES 1.77 (stat) (sys)NC 5.54 (stat) (sys)
+0.05 +0.07-0.04 -0.08+0.24 +0.09 -0.21 -0.10+0.33 +0.36-0.32 -0.24
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Comparisons
NC • Agreement with past measurements (estimated p-value = 0.328)
• Agreement with standard solar models
Φe (x104 cm-2 s-2)
Φµτ
(x10
4 cm
-2 s
-2)
Corrected to Winter 8B spectrum
Flux (x 106 cm-2 s-1)
D2O (306 d)
Salt (391 d)
NCD (385 d)
φSSM = 569(1±0.16) x 104 cm-2 s-1 (BSB05-OP: Bahcall, Serenelli, Basu Ap. J. 621, L85, 2005).
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MSW Contours
SNO only
Solar Solar +KamLAND
Cl-ArSuper-KSAGEGallexGNOSNOBorexino (first result)
766 t-y KamLAND
• 2-neutrino mixing model.• Marginalized 1-σ uncertainties.• Solar + 766 t-y KamLAND:
degree
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Summary
• A model independent measurement of the 8B flux• Improved precision on mixing angle θ• Reduced correlation between CC and NC• Different systematics• Agreement with previous measurements
More from SNO• LETA (Low E Threshold Analysis) of Phases I and II (T=3.5-4 MeV)• Muons, atmospheric ν• Three-phase solar neutrino analysis• Three-neutrino mixing analysis• Three-phase hep flux• Three-phase solar neutrino Day-Night Asymmetry
arXiv:0806.0989v1 [nucl-ex]
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Expect the Unexpected
• Found at the bottom of the cavity:
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The SNO Collaboration
The SNO collaboration University of Alberta, University of British Columbia,Carleton University, University of GuelphLaurentian University, Queen’s UniversitySNOLAB, TRIUMF
Brookhaven National Laboratory,Lawrence Berkeley National Laboratory,Los Alamos National Laboratory,Louisiana State University, MIT,University of Pennsylvania,University of Texas at Austin,University of Washington
LIP (Lisbon)
University of Oxford