Error Analysis
description
Transcript of Error Analysis
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Error Analysis
Analytical
02 October 2013
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Penfold-Leiss Cross Section Unfolding
• Measure Yields at: where,
• The solution can be written in two forms:
nEEEE ,,, 21 niEE ii ,2,1
i
jjji
E
th ii EEENdkkkEnEY i
1
)(),,()(),()(
1
1
1 i
jjiji
iii NyN
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NY
nnnnnn NNN
NNN
y
yy
2
1
,2,1,
22,21,
11,
2
1
0000
• Or, Matrix form:
YN 1
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Statistical Errors
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Statistical Error Propagation (1)
• With:
1 NB
YB • Then:
TBdYBd 22
• Note:
ii
i
yydy 1
bgiii yydy 2 In case of
background Subtraction
01
ijij
ij
NNdN
ii ydy
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ny
yy
dY
00
0000
2
1
2
• Where:
0),cov(),var(
ji
iii
yyyyy
221
22212
12121
2
),cov(),cov(
),cov(),cov(),cov(),cov(
nnn
n
n
d
dd
d
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Statistical Error Propagation (2)
ii
i
i
i
yydyd 1
22
1
1
1
1
1
1
222
2 ),cov(1 i
j
i
k
i
lillkikjiji
iii NNdNdy
Nd
For mono-chromatic
beam
Although,
0),cov(
,0),cov(
ji
ji yy
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Statistical Error Propagation (Wrong)
YN 1
• Then:
2122 dYNd
• This is equivalent to:
1
1
222
2 1 i
jjiji
iii dNdy
Nd
Wrong
Wrong
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Absolute Systematic Errors
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Systematic Error Propagation (1)• For absolute beam energy uncertainty of δE (= 0.1%):
)()()(
iij
iijiij
ij
ij
ENENEEN
NdN
)()()(
ii
iiii
i
i
EyEyEEy
ydy
Ei (MeV) dyi/yi (%) dσi/σi (%)
7.9 17.4 12.6
8.0 12.3 10.5
8.1 10.0 9.1
8.2 8.6 7.1
8.3 7.6 6.3
8.4 6.8 5.8
8.5 6.1 5.2
This is the cross section dependence on energy
• Accounted for dNij due to energy error when calculating dyi
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• With:
1 NB
YB • Then:
TBdNdYBd 2222
022.0017.0018.0018.0018.0018.0018.00017.0020.0021.0021.0021.0021.000020.0023.0025.0025.0025.0000025.0029.0031.0031.00000033.0039.0041.000000050.0058.0000000100.0
/ ijij NdN
iE
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222
21
222
221
211
2 000
nnnn dNdNdN
dNdNdN
dN
• Where:
2
22
21
2
00
0000
n
2
22
21
2
00
0000
ndy
dydy
dY
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Systematic Error Propagation (2)
21
1
2
1
1
1
1
1
1
222
2 ),cov(1
iii
i
jjij
i
j
i
k
i
lillkikjiji
iii
dNdN
NNdNdyN
d
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Other Absolute Systematic Errors
2222
22 )( iii yTT
RR
IIEdydy
Beam Current, δI/I 3%
Photon Flux, δφ/φ 5%
Radiator Thickness, δR/R 3%
Bubble Chamber Thickness, δT/T 3%
Bubble Chamber Efficiency, ε 5%
• Then:
22
2ijij NdN
Simulation
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ResultsI. Radiator Thickness = 0.02 mmII. Bubble Chamber Thickness = 3.0 cmIII. Number of 16O nuclei = 3.474e22 /cm2
IV. Background subtraction of 18O(γ,α)14C V. 17O(γ,n)16O: Still to do
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ElectronBeam K.
E.
BeamCurrent
(µA)
Time(hour)
yi dyi (no bg)
dyi/yi (no bg,
%)
dyi (with bg)
dyi/yi(with bg,
%)7.9 100 100 545 23 4.2 134 24.6
8.0 100 20 581 24 4.1 77 13.3
8.1 80 10 852 29 3.4 60 7.0
8.2 20 10 634 25 3.9 40 6.3
8.3 10 10 812 28 3.4 39 4.8
8.4 4 10 746 27 3.6 36 4.8
8.5 2 10 763 28 3.7 32 4.2
11004.611137.912187.112435.112663.112875.112075.2012217.112852.112406.212908.212370.312801.30012086.312692.412097.612369.712540.800012258.612514.913236.113494.1000013539.213858.313013.50000013439.613782.900000014267.3
eeeeeeeeeeeee
eeeeeeeee
eeeee
e
N
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ElectronBeam K. E.
Cross Section (nb)
Stat Error(no bg, %)
Stat Error(with bg, %)
7.9 0.046 4.4 24.5
8.0 0.185 6.0 20.7
8.1 0.58 6.3 14.7
8.2 1.53 8.2 13.8
8.3 3.49 9.1 13.3
8.4 7.2 10.6 13.8
8.5 13.6 12.2 14.8
ElectronBeam K. E.
Cross Section (nb)
Sys Error(Energy, %)
Sys Error(Total, %)
7.9 0.046 17.4 19.5
8.0 0.185 18.1 21.5
8.1 0.58 18.4 22.9
8.2 1.53 18.9 24.9
8.3 3.49 19.7 27.2
8.4 7.2 20.6 30.0
8.5 13.6 21.6 33.0
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ElectronBeam K. E.
GammaEnergy (MeV)
ECM (MeV)
Cross Section
(nb)
SE1 Factor(keV b)
Stat Error(%)
Sys Error(%)
7.9 7.85 0.69 0.046 62.2 24.5 19.5
8.0 7.95 0.79 0.185 48.7 20.7 21.5
8.1 8.05 0.89 0.58 41.8 14.7 22.8
8.2 8.15 0.99 1.53 35.5 13.8 24.9
8.3 8.25 1.09 3.49 32.0 13.3 27.2
8.4 8.35 1.19 7.2 28.8 13.8 30.0
8.5 8.45 1.29 13.6 26.3 14.8 33.0
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12C(α, γ)16O S-Factor Statistical Error: dominated by background subtraction from
18O(γ,α)14C (depletion = 5,000)
Systematic Error: dominated by absolute beam energy (δE = 0.1%)
SE1(300 keV) = 74±21 keV b
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Relative Systematic Errors
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Systematic Error Propagation (1)• For absolute beam energy uncertainty of δE (= 0.1%) and zero
relative beam energy uncertainty:
)()()(
iij
iijiij
ij
ij
ENENEEN
NdN
)()()(
ii
iiii
i
i
EyEyEEy
ydy
Ei (MeV) dyi/yi (%) dσi/σi (%)
7.9 12.5 12.6
8.0 10.8 10.5
8.1 9.3 9.1
8.2 8.0 7.1
8.3 7.0 6.3
8.4 6.3 5.8
8.5 5.6 5.2
This is the cross section dependence on energy
• Accounted for dNij due to energy error when calculating dyi
EE 8.70
iEEi 0
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• With:
1 NB
YB • Then:
TBdNdYBd 2222
022.0017.0018.0018.0018.0018.0018.00017.0020.0021.0021.0021.0021.000020.0023.0025.0025.0025.0000025.0029.0031.0031.00000033.0039.0041.000000050.0058.0000000100.0
/ ijij NdN
iE
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221
2212
1212
1
2
nnn
nn
n
dydydydydy
dydydydydydydydydydy
dY
• Where:Note: Correlation Coefficient =1
jiijji
iii
dydyyydyyy
),cov(),var( 2
221
22212
12121
2
),cov(),cov(
),cov(),cov(),cov(),cov(
nnn
n
n
d
dd
d
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222
21
222
221
211
2 000
nnnn dNdNdN
dNdNdN
dN
2
22
21
2
00
0000
n
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Systematic Error Propagation (2)
21
1
2
1
1
1
1
1
1
2
1
1
22
2
),cov(
21
iii
i
jjij
i
j
i
k
i
lillkikjij
i
jjijii
iii
dNdN
NNdN
dNdydyN
d
0),cov(
,0),cov(
ji
ji yy
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Other Relative Systematic Errors
2222
22 )( iii yTT
RR
IIEdydy
• Then:
22
2ijij NdN
Simulation
Beam Current, δI/I 3%
Photon Flux, δφ/φ 5%
Radiator Thickness, δR/R 3%
Bubble Chamber Thickness, δT/T 3%
Bubble Chamber Efficiency, ε 5%
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ElectronBeam K. E.
Cross Section (nb)
Sys Error(Energy, %)
Sys Error(Total, %)
7.9 0.046 12.5 15.3
8.0 0.185 10.2 13.5
8.1 0.58 8.3 12.2
8.2 1.53 7.0 11.4
8.3 3.49 6.0 10.7
8.4 7.2 5.3 10.5
8.5 13.6 4.7 10.1
Relative Systematic Errors Results
Note: Relative systematic errors do not get amplified in PL Unfolding
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12C(α, γ)16O S-Factor Statistical Error: dominated by background subtraction from
18O(γ,α)14C (depletion = 5,000)
Relative Systematic Errors
SE1(300 keV) = 74±21 keV b