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XY

T-Station(

5)

T
T1
T2

Near
Detector

Decay
Tunnelv39
2nd Horn(Reflector)

To SK

b48

1st Horn(Collector)

Muon Pit(
Mu2

10)
Beam Dump
12-GeV Proton Beam

SSD
Array

Mu1

Muon Profile
Monitor

GL 5m

GL 0m

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V39outSPICTARGET
SPIC

Beam Pipe(Vaccum)

Target
128cm

37cm
o

Beam is tilted in 1.05

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&X

L

C=6mF

AC400VR
HORN

2.2secHORN

CAPACITORCHARGING

250kA

1msec

CURRENTPROTONBEAM

1µ sec|q +">.:r=&.k`¦w f9.>(1/0G-@>.:0:;*</F>.9.9( 1GT<AJ":A*Q +*<A/ " 

S# &wk X '\]:;   /]<F@>.:A:r*<f/?>.9.9(1 GE<AQ<F":A*HQ +"*<A/)2*T>.*1<0/] B!6k #*@\. h Z! 6t>/0/ <9 X @kf#S1/ BP":0=>(2 /)h  (  GT2*<Fe 2:f9.6:;<f BK":A*.'|q +">.:r5&.k`/? \/=<?@9., ( 1<;DR B">.:":A*E/0D"/A<0k f/0s>(2 <AG *><F:;2*Top>8I,w hZ.k"36]«I\1<?N& 6Z! @>.:A:r*</F>.9.9( 1GH<A<F":A*Qj +"*<A/1/f,w"><&6&)<A2/f":;f<?.*<F*">( (@>.:A:;*6<f@ /0k«K6:; ">/t /F>.:;*6<A/. h=,w*-j G.e<A>.*G.:;/A<?*GT<Fe@.:A @<0:; /A<A @/]uBK<F /e":A*/0D"/;
<Ak| ":8.Q9( [}Q +"*<01@iy ( G u/F>.:;*6<A/>/A2*+5N9 @! >.9T@61(S[9.:BS":AQ6*@e<A/A<) BK<F@( s*+J/AD/A<A[*G/AQ"*kf/Ae:;/?>.QQ:; %GHs* "[ ¦ klOt>/A<<F! f2*6<AQ @@">.*6<gG.$ .}:;*@2*,w@"*G. <A "*/f2*JV">.* XYY6Y *GN/0s*@) f h,w:XYY6Y ,w@>/AQ">.: X /A<e:A*H\ u/]@.*+GT2*b,.<;\g*klb2*@:; /0Gb<FG.2<A:  BK<F<F:;+6<
9.:;<) Bg<F X /A<":A*{B%:r"&6ZQ O<AnZQ  s* ":;G.:)<AJ/A<F:;*+6<F*H<F\6! /A<9.:;< +" 2*/A<<F)( @<F:;"Qu+"*<A @)BP:;@kq)@@":;G.2*+( D\g]@">( G5 ( /A2*@:; /0e<F)@>.:A:;*6<g/F>.9.9( 1GT<A<F":A*Q +*<A/gBC:;"&ZZ!6m<AJ& Z!6m<F.*.!6/f<Aj<F /tG.y @ <A "*k  ./.+)/=9 "*/Q9.:;G >@GR,DT<F9.:;<A*-,wW:;Q*:r+<A @[<F2:e( BS<A25,.@"/=( "*+6:<F.*<FQ9.:;"9w:f( BS<A2&wk` afX Z   /#P@ * ¦.k`j'],6D5 $ ":;** %iB%u@<A":,k C*H":;G.:)<AQ!u=9 "*/G.@ D

 '* w _`Z   , )h   )  number of neutrinos/cm2/1020POT

&6&

Mean
ALLCHAN

1.294
0.1303E+07

80000

70000

60000

50000

40000

30000

20000

10000

0

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

Eν(GeV)|q +">.:;5&.k.:BP:AQ*@J B">.:Q":A*E/0D"/A<0kRf/F. G.Gx#/A(  G 'N /A<0+":A/=/? \<F b
/A2>(2 <AG-*><?:;2*op>85 <f.x\f <FJ<?@>.:A:;*6<f/F>.9.9(  G-<0=<?e":A*Q +*<A/f BZ6! #S& Z6!'[\]:;<?e<F:r+<gG.s6<A:g /)<F:;+<g /nZQ 

Iron and Soil

Fe
3.5m
beam
dump

300cm

Filled with He gas

100m

90m
Iron and Soil

150cm

200cm

10m

|q1+>.:;e&.k Y q@Q <A @ih" \ B<?G.@D929.k )h   )  &6n<A*><F:;2*/N@ *6<A( D[\geG./A +"*G J&ZZ6iC( "*+NG.@ D<F>.*.*(\] @-.u/eN:AuG.s>/) BZ.k¦ .[ X kZ*G X (k k|q +">.:;=&wk Y /F \f/g<Fe/A@Q <01@h \ uB<FG.@ D929. Bq<F /]8.9.:;2*6<kQG.@ D 929w1/iy ( ( GI>.9T\f <FE( s>. +" /e,.@6>/AN<?N2*6<A:A @<A "* (1*+6<FbuB( 2>.W+"u/ /N,w">< 5<0s/Q( "*+:<F.6*  2:k # C*6<A:Au@<A "*E( *+<FE Bt( 2>.5nwk` "!5#S.' '[<F. < B)]2:
Z.k`¦6n X !5#S.' 'A'k %<e /Q ( /A52Q9w":;<F*6<e<0-:;G >@J<FN*>.,.:uB*><?:;2*/Q9.:;"G >@GE2*b<?N+"u/\] @5Q DJ@>/Ae*>.*@:;<? 2*<;DJs*{<F /]8.9.:rs*<k
 ")  "     !./)- ! "%}    } p; . i 1/5!62*Gb B]9 @^!u>.9b@61(/A*/A <A hQ<0<FN,.67@>.:A:;*6<kJfQ/A@Q <A @Qh \  Bffx //F \]*J2*|q + k&.k X Z.kIntegrating CT

Beam

50 Ω

Output

Beam

166mm

122mm

51mm

Read out ADC|q +">.:r=&.k X Z. @Q <A @ih" \ B<?ef:;N:; X nHfg/e2*O<F9.:;2Q:;D ,wiC( 2* #S,( &.k X 'kfD :rN>/AGI /9.:;<A"*O,.
2*<0*/A <DR"* <A:;/= <h :; ">/Q9.2*6<A/kbgQ9.:; /A"*E*+5<F/A5xh u(s>/J+ h/2*6BP:AQ <A "*"*T<?Q<F:A*/?9.":;< J@1*@Dm# G. \]* /A<F:;2*6<A*/A <;Dv~T>.9/A<?:;72*6<A*/A <;Dv'kQ N@ *@D  /<;Dv9 @ ( ( D ª ;  B%:;<F8<F:A @<A "*9w2*<)<A<Fi<F:;+< k @ f1/j@ ( s,.:0 <AGM>/0s*+E9.>(1/0GI@>.:A:;*6<N*GI,w  /j\( (SkRf5,/A6(s><05*">.,.:j B
9.:;<0"*/f /] /?>.:;G5\f <F2* X Z:A:r":km( @ <AG ?A>/A<,.?BS":;Q<F<F6:;+<=#@u(1( G ?f X  ']*1<0":f<?*>.,.:) Bf9.:;<A*/]"*H<F
<F:r+<]G.(  h:;GO<A+*:A <0e<FQ*><F:;2*T,.k |q1+>.:;Q&.k XX /F \f/)<Fs*6<A+":0 <AGb9.:;<A*/]"*<Fg<F:r+<#  3f' u/KgBC>.*@<A "*i Bp(29/0G=<0s/0s*@<   D XY6YY <A ( ( V">.*f&Z6ZZ.k <0<F ("*>.,.: BK9.:;<A*/ >/0GBS":g<Fe*.u(1D/A / <g<FBC:/A <A[.>.9.:1!*G.[ /]&._& Yia X Z c Y  3k1     . .    .  pT v   1   = !  Cg/e6:;N>/AGTBS":)<FQ9.:;uy (1J /F>.:;*<i B<FQ9.:;2Q6:;Db9.:;<A"*/ k=f:rN:;Q&!  Cg/
2*<F,.=C(12*iBC:;"<F8<F:Au@<A "*59w2*<f<0Q<Fe*6<F:A6*@ B<?G.@D5929w{#% ,( &.k X 'kqf
9.:;2*@29( Q Bq1* %u<A "*@.,.:;/1/)/F \]*J2*|q + k&.k X &|q ( ( GT+" /f2*H<FeG.<0@<A":g / "* %Gb,D5:AuG.su<A "*/'k S* %GO(1@<?:;"*/Q#":f9w/A <A h( D5@.:;+G "*/F'q:rK@( ( @<AGN <<Ff*G.e#":@ <?"G.'gk|qs*.u(1( D@( ( @<AGJ(1@<?:;"*/]# "*/F'Q!u*i( @<F:; @/A +"*. (S,k 6]*:Au( 9.:r"9.:;<01/) Bq "* % <A "*H@^.6=,w:;/]:rG./A@:;2,.GT2* "6 ;k )h   )  &<Accumulated POT (10^18)

25

20

15

10

5

Protons/Pulse (10^12)

0
6
4
2
0
Apr99

Jul99

Oct99

Jan00

Apr00

Jun00

Date

|q +">.:;f&.k X6X K# @)9.9.:A' C*6<A+":A <0G=*>.=,w:q Bp9.:r<A"*/q"*i<Fg<F6:;+</A2*@'bD X YYY <A (1(V">.*]&Z6ZZ.k# $ \g:A' C*6<A*/A <;D B <?=9.:;<0"*N,w <g<Fe<F6:;+<g2*<Fe>.* <) B 9.:r<A"*/f9.:)9.>( /A#%9.9.9.'k

-

+
V0

Cathoderadiation+ + + + + + +- - - - - - -

d

Vch

C

R

VR

Anode

output|q +">.:;&.k X &.qfe9.:rs*@29( Q Bq<F "* % <A "*H@.,.: )h   )  &;! Cg/>/AGb2*b& .h6=/0+"*6<AG *G.Q<A5u/F>.:;<FQ9.:;<A @( JG.*/A <DT/F \]*H2*|q + k &.k X n.k
to ADC

to ADC

Protonbeam

Protonbeam-HV|q +">.:;=&wk X n.@^Qu<A @eh1\ Bq<Fe! >/0G52*5&k

%<@"*/A /A<A/i BK<F.:;j@"9.9.: /F<A/kfQ@*6<F:A ("*Q / BP":<FN6*"G.N9(2*T# A#f«'[*Gb<F
<F:r/:;BS":K":r % *<Fu(p*GJh:;<A @ (:; G."><g@ <?"G.Q# 6(<e'q9(2*/kKt:;uG."><f9(s6*/ . h
n&J@.*.*( /BS":)8-6*G-DT:; G.">< ke)/<FN9.:;6<A"*5,w7G.2:;@<0(1Db <A/i<F /e@.,.:[<F@"9.9w:/F<g /fQ G.] /g<F2*J /9w/A/A2,( [ & {k"T /0<K BF#S&)">< B &' <F]@.,.:r/. h]  Q 9 <A@

/A<F:rs9[68"@9< BP:"*f@.,.:K,w?BP:;f<Ff<?:;+<q\] @Q. /g X k`&¦jx91<0@^[*GBS":"*f@.,.:,.?BS":;i<FG.@ D5929.e\)1@T. /]Q&u@ 9 <A@^kgf/A"* <A":r/]:; .> <A=>/A?BC>(BP":<Fi/A<A:;2*+
 Bq<Fe9.:;<0"*,.{kKfe! g/>/AG52*5x:;G./A@:rs,wGTs* " Y k|q +">.:r=&.k X N/F \f/)<Fi"*( s*jG.1/?9(s DHBS":],wiC( 2*"* <A":;/k)K*+(  /FT@.:Au@<A:;/)/F \ <F"* <A:f*. Skk 0«tn Y "><Q/A<?*G./fBS":g<?e"* <A":( "@ <0G5G. \]*/A<F:r Bq<F=n Y <FJh:;<01@u(G.29.( QQ +*<kq ,( &.k X /F>.jQ:; %/f<F( @ <A "*H*G5<;D.9. Bq<Fe,.6iC( s*J"* <A":;/ k
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500MHz
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PMT

466cm
10.5cmt 4.2cm
10.8cmlight
guide

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PMT

light guide

122 mm

135 mm

φ76

3.70

122 mm

140 mm

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cosmic ray
22.5
20
17.5
15
12.5
10
7.5
5
2.5
0

200

400

600

800

1000

1200

1400 1600 1800
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6Z

0.3

energy resolutionenergy resolutionenergy resolution
0.2

0.1
0.09
0.08
0.07

0.3

0.2

0.1
0.09
0.08
0.07

0.06

0.06

0.05

0.05
10

3

10

10

10

lg7 energy(MeV)(energy resolution)**2(energy resolution)**2

lg4 energy(MeV)

-1

10

10

-2

10

2

10

3

lg 10 energy(MeV)

3

-1

-2

10

2

10

3

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sigma/mean (X- pos. depend.)
0.35

0.3

0.25

0.2

0.15

0.1

0.05

-100

-75

-50

-25

0

25

50

75

100

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Tracking efficiency
1

0.8

0.6

0.4

0.2

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

5.5

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Muon tracks at 200kA (MC, Cho-CERN)
1800

Entries
Mean
RMS
UDFLW
OVFLW

1600

24813
0.1139
11.53
737.0
1124.

1400

1750

1200

1500

1000

1250

800

1000

600

750

400

500

200

250

0

-40

-20

0

20

40

Entries
Mean
RMS
UDFLW
OVFLW

2000

0

-40

fitx-truex
1600

Entries
Mean
RMS
UDFLW
OVFLW

1400

2000

1000

1250

800

1000

600

750

400

500

200

250
-0.2

0

0.2

Eµ(Fit-MC)

20

0.4

Entries
Mean
RMS
UDFLW
OVFLW

1750
1500

-0.4

0

40

fitx-truex
24631-0.1414E-01
0.1457
145.0
214.0

1200

0

-20

24813
-0.9591E-01
7.647
135.0
406.0

0

-0.4

-0.2

0

0.2

angle(Fit-MC)

24631
0.8960E-02
0.1352
538.0
910.0

0.4

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/A<F6:;<<A22*+5 Bg<FN b<F:r1+6+: /=u&G ?r>/A<0G X  Q,.?BS":;Q<?N,. <A2kNs:rGb<;Dv9wQ /= ( /A<F<A22*+J2*6BP":0Q <A "*{(1*+:g<F.*  MB%>( (}/A@u(1k $6G.<A@<A":/AD/A<A:;uG./><f"*( DN<?]@.:;+)2*6BP:AQ <A "*kfe:; G."><g/AD/A<A /f<F|..9 & @]J, eg/] /<Fh<AN6*G<F:; ++:g@>.*<A:r/kqfe, e +" <0]\f G.<F{ / X (k  /A@k >"*@^.,w:/A +"*. ( /:rgBPGj<A]<?f( @<F:;"* @,. 8"/ kf( @<F:;"* @/f,. 8e@*h:r<q @^\f2:;*. ( +J/A +"*. (<ANjG.1+61<? (9.>( /A/A +"*.u( \f <F{<A22*+2*6BP":0Q <A "*kff*[<Ff4 3 T:;DG >( /]@( ( @<e <f\f2:;i<A2e2*6BS":AQ <01*J\f <F2*5n /A@ BP":<Fi@"Q9.><A::; GC"><k )h   )  6¦Front detector DAQ
online WS

monitor PC
data transfer to Data Server

Ethernet

SCALOR

muon
Chamber

VETO
PMTs

Sun Bit3

FIFO

MP

MemoryModuleFastbus

FADC
(NIM)

ATM

ADC

lead glass
PMTs

IIT,CCD
SCIFI

water Cerenkov
PMTs

ADC

CAMAC

F-I/F

TMC
C-I/F

MP
TKO

HPRT

MP

HPRT

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G /A<F*GBS":<F9.6/A <A "*QuB <?],.*G
*G BS":g<Fe,w G.1h6:;+*@kY  )   " 

6Z

 

Run 001806 subrun1-1

Constant
Mean
Sigma

3000

ADC count (ped.sub.ed)

ADC count (ped.sub.ed)

Run 001806 subrun1-1
3500

3457.
16.91
2.912

2500
2000
1500

1200

800
600
400

500

200
5

10

15

20

25

0

30

5

10

15

20

25

Channel number
ADC count (ped.sub.ed)

ADC count (ped.sub.ed)

TARGET SPIC x
Constant
Mean
Sigma

3000

30

Channel number

v39out SPIC x
3500

1310.
16.54
3.405

1000

1000

0

Constant
Mean
Sigma

1400

3541.
18.33
1.887

2500
2000
1500

Constant
Mean
Sigma

1000

962.0
10.79
5.312

800
600
400

1000
200
500
0

5

10

15

20

25

0

30

5

10

15

20

Channel number

25

30

Channel number|q +">.:;5n.k X Qf+K:r<A"*E,.W9.:;uy (1/ /?>.:;G$,6DE<FN<;\gb!g/N,.?BS":;J<F<F6:;+<kb<F:rs9\f G.<F{ B 0«tn Y "><e / QQ 6*G<F. <f B F} 6K  / X k`&¦Q
v39out SPIC y

TARGET SPIC y

26mm

87mm
41mm

57mm

TARGETSPIC

V39outSPIC

Target
6mm

26mm

37cm

87mm

X direction

58mm

Y direction

128cm

Target36mm

41mm|q +">.:;5n.k&.NfJ/A@Q <A @h \ B)<F9.:r<A"*E,.  <A<F*@@ ( @>(2 <A "*kUf/F. G.GI:;?
+ "*/@":A:r/F9."*GE<AH<Fn I@*<A>.:+ h*E,DEJy <<A5<?9.:;uy (1G u<F5 /0/F>.2*+b* 6>/A/A2*
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X

20

y divergence (mrad)

x divergence (mrad) 

15
10
5
0

6
4
2
0
-4

-10

-6

-15

-8
-2

-1

0

1

2

x position (cm)X VS DXy position (cm)

8

-2

-5

-20

10

-10

-2

-1

0

1

2

y position (cm)Y VS DY

2
1.5
1
0.5
0
-0.5
-1
-1.5
-2

-2

-1

0

1

2

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November

1750

1400

1390.
18.54
1.636

1200

1500

1000

1250

800
600

10
0
-10

750
400

500

10
8
6
4
2
0

250

200

0

0

20

30

10

20

1416.
19.78
5.495

1200

30

Constant
Mean
Sigma

1600

1495.
11.86
4.880

1400
1200

1000

1000
800

0

1

2

-10

-4

-2

x position (cm)

0

2

4

y position (cm)X VS DXY VS DY

2
1.5
1
0.5

-0.5

600

400

-1

0

800

600

-2

ch
ADC count

Constant
Mean
Sigma

1400

-6
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-30

y position (cm)

10

-4

-20

ch
ADC count

20

-2

1000

-1

400

200
0

30

y divergence (mrad)

2000

Constant
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Sigma

x divergence (mrad)

2120.
16.74
3.257

ADC count

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2250

-1.5

200
10

20

30

0

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10

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30

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CHO ET AL. [56]
[57]
[58]
[59]

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Neutrino flux

number of neutrino/cm2

x 10 81400

Mean
ALLCHAN

1200

1.440
0.2068E+13

1000
800
600
400
200
0

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

number of neutrino/cm2

Neutrino energy (GeV)
90000

Mean
ALLCHAN

80000

1.460
0.1571E+07

70000
60000
50000
40000
30000
20000
10000
0

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

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Neutrino flux at Near Detector (KEK)2number of neutrinos/cm

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Neutrino flux at Super-Kamiokande

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νµ
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10 5

10 4

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10 3

10 9

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–

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10 2

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8

νe

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νe
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10 7

10

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4

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20

10 9

2

10 9
10 8
10

7

0

1

2

3

4

5

10 8
10 7

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νµ energy (GeV)

1

2

1

2

–

3

4

5

–

3

4

5

νµ energy (GeV)

2

20

10 9

number of neutrinos/cm /10 POT

2

10 10

2

20

number of neutrinos/cm /10 POT

number of neutrinos/cm /10 POT

10 11

20

number of neutrinos/cm /10 POT

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10 8
10 7

0

1

2

3

4

5

10 7

0

νe energy (GeV)

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at KEK (Cho)

800
600
400
200
0

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

20

1200

1200
1000

Mean
ALLCHAN

1.325
0.1759E+13

at KEK (Cho)

800
600
400
200
0

5

November

1400

2

1.255
0.1695E+13

number of neutrinos/cm /10 POT

Mean
ALLCHAN2

20

number of neutrinos/cm /10 POT

x 10 8June

x 10 8
1400

0

0.5

1

1.5

2

2.5

3

3.5

4

1.232
0.1304E+07

5

1.303
0.1318E+07

70000

70000

at SK (Cho)60000

at SK (Cho)

60000
50000

50000

40000

40000

30000

30000

20000

20000

10000

10000
0

Mean
ALLCHAN

80000

2

20
2

80000

20

Mean
ALLCHAN

90000

4.5

Eν(GeV)
number of neutrinos/cm /10 POT

number of neutrinos/cm /10 POT

Eν(GeV)

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

0

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

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Jan.-18-97

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Dec.-27-96
Mar.-6-97-1

10
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total

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10

200

300

400

500

600
700
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16000

Number of events

14000
12000
10000
8000
6000
4000
2000
0

-400 -2000

200 400 600 800 1000 1200 1400h?BfZSGKTJ4©pÝqU?eR?e;@fÐjG?BA(=K6?]bGS@=9?Y@;¨Y^$=>@J¥>@?B=m?e;v=>@J=K6?f[fIJLKCEYZSG;[=(JLKEp¨qs>@JAH@?B~~lf@FP=(Jm?AmjGJ*8;@JEj
bGJE=TOUJEJL;mª [I;@A(JEC,FI;@j|IÜII;@A(JECIp
TG cluster time (nsec)

1000

800

Selected
600

400

200

0

h?BfZSGKTJ4©prq >@JljGJLHYIA(?B= JL;@JLKTf[djG?BA(=KT?ebGS@=(?BYZ;ÖYPr=>@Jl=K6?f[fIJLKCEYZSG;I=9JLKQFXÀ=(JLK¤=>@Jl=(?eR?e;@fCLS@= FI;@j=>@J
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0

5

10

15

20

25

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number of events/10MeV

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Ä =~BJLFPA(=YZ;@J|CE~eS@A(=9JLK¥Os?=*>¨~eFIK6fIJLK=>GF[;¶ÜI®0JE¯?e;=*>@J|~BJLFPjfI~eFPA(A»CEYZSG;[=(JLKm?BAKTJEºGS@?eKTJEj2ph?f@SGKTJ 4©p_A>@YPO=>@JlJL;@JLK6fIdjG?BA(=KT?ebGS@=(?BYZ;&p
10

6

10

5

10

4

10

3

10

2

0

200

400

600

800
1000
LG total energyh?BfZSGKTJ(4©pDo;@JLKTfIdmjG?BA(=KT?ebGS@=(?BYZ;0Y^¤«i½CE~eS@A(=(JLK6ALpR/J<ETJECE=(JEj¥~BYPOUª¢JL;@JLKTfId¥bGF^C [fZKTYZSG;@jGA/FIKTJ,=*>@YZS@fZ>[==(YtbJlCE~B?]HGH@?e;@f»CEYIAR?BC*ª K(FÜdHGFIKT=(?BCE~BJEALp
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1200

1000

800

600

Reject
400

200

0

0

1

2
3
4
5
6
7
8
No-MUCTRACK Num of MUC 1st layer hits

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10

2

10

1
0

20

40

60

80

100

120

140

160

180

200

3500

4000

TGE

10

2

10

1
0

500

1000

1500

2000

2500

3000

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KTJLFPjGY@S@=QJE~BJECE=K6YZ;@?BCEAgw Ä qU®|yCLF[;G;@YI= KTJECEYZKTjm=>@JlJE{IJL;[=(AQHGK6YZHGJLKT~Bdmj©S@Jl=(Y?B=(AUjGJLFPjt=9?]R\JIpD:¢;mYZK6jGJLKD=9Y
jG?BA(=(?e;@fZS@?BA>ÖAS@C >`RgS@~B=(?eH@~BJ,JE{[JL;I=(A?e;tFAH@?B~~MGOUJ/jGJE{IJE~BYZHGJEj¥F_HGKTYIfZK9FIR³=(Y,?BjGJL;[=(?Àd`JLFPC >mHGJLF[?e;=>@J
HGS@~BA(J>@JE?f@>I=_jG?A9=KT?ebGS@=(?BYZ;&ph?BfZSGK6JtGpe_jGJLRYZ;@A(=*K(FP=(JEA,FI;»JE{IJL;[=,jG?BAH@~eFÜd0YPQ=*>@JJE{IJL;[=ljGJE=(JECE=(JEjÐb[dnlqO}>@?BC >`CEYZ;[=FP?e;@AU=TOQY,;@JLS@=*KT?e;@Yg?e;[=(JLK(FPCE=9?Y@;@AQY@K?e;@CEYZR?e;@ftRS@YZ;@ALp:<;=>@?BAUJE{IJL;[=LM@OUJ CLFI;`A(JEJ =TOUY + N )(  $&'(.&'*  % &, K 

NUM
6
RUN
2341
SPIL
54479
SUBRUN
9
EVENT
30490
DATE **-Feb- 4
TIME
18:33:51
TOT PE:
17108.8
MAX PE:
173.3
NMHIT :
669
ANT-PE:
2.2
ANT-MX:
1.6
NMHITA:
2

Number of inner PMTs



35
30
25
20
15
10
5
0
700

800

900 1000 1100 1200 1300 1400 1500 1600

TRG ID :00000001
TMC Ch1:TMC Ch2:TMC Ch3
0.23: 0.28: 0.90
0.70: 0.76: 1.37
T diff.:0.
us
Q thr. :0.0
SUB EV : 0/ 0

Inner PMTSUM pulse height

ATM T (nsec)

FADC channel

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?e;G;@JLK<ª¢jGJE=(JECE=(Y@Kl®|qUAlKTJECEYZKTjGJEj0bId Ä qU®FI;@j¥=>@JHGS@~BA(Jt>@JE?BfZ>[=}jG?BA(=K6?]bGS@=9?Y@;0YPQ®|q G²s®¬A(?BfZ;GFP~¢KTYZR¿=>@J?e;G;@JLK<ª¢jGJE=(JECE=(Y@K,®|qUAlFPA,F`¢SG;@CE=(?BYZ;0YPD=9?]R\JtKTJECEYZKTjGJEj|b[d¥h Ä k,¦4w ~BYPOQJLK ª KT?BfZ>I=*yEpl:¢;0=>@J~BJ*À=¤©fZSGKTJIM@=>@J}SG;[YI~BjGJEjm{Z?BJEOYP2=>@J ?e;G;@JLKjGJE=(JECE=(YZK¤YPrnlqv?BÄAUA>@YPO};&MIFI;@jm=>@J}K(F^jG?]S@AUYP&JLFPCE>ARFP~B~
CE?eKTCE~BJ¾K6JLHGKTJEA(JL;[=(A}=*>@J\HGS@~BA(J>@JE?BfZ>[=lYPQJLFPCE>0®|qUALpll;@~Bd0h k,¦ÁCLFI;»CE~BJLFIKT~Bd|KTJECEYIfZ;@?BÃEJ=*>@JgJE{[JL;I==(YCEY@;I=F^?];RS@~B=(?eH@~BJ;@JLS@=KT?e;@Yt?e;[=(JLK(FPCE=9?Y@;@A YZKU?e;@CEYZR?e;@f¥RS@YZ;@ALp~eFIKTfIJHGJLFI[A/CE~JLF[KT~Bd¥?e;=>@JHGS@~BA(J>@Ä JE?f@>I=/jG?BA(=KT?ebGS@=(?BYZ;0Y^ =>@J®|q G²s®¬A(?BfZ;GFP~xKTY@R£=>@J,®|qUA/YP
=>@J_?];G;@JLK/jGJE=9JECE=(YZK KTJECEY@KTjGJEj|bIdmh k,¦MGO}>@?B~BJg?B=/?BAljG? mCLS@~=l=9YjG?BA(=(?e;@fZS@?BA>0=>@JEA9J,JE{IJL;[=(AlbIdS@A(?e;@f=>@J?e;[ÀY@K(RFP=(?BYZ;0KTJECEY@KTjGJEj|bId Ä qU®vp Ä bGYZS@=lI¡ YPQF^~~=*>@JgA*H@?~B~BA,?BAlJEuGHGJECE=(JEj´=(YtCEY@;I=F^?];0RS@~B=(?eH@~BJ?e;I=9JLK(FPCE=(?BYZ;@AlO ?B=> : LI;@A9JECg=9?]R\JgOs?jG=*>@?];¸=>@JAFIRJ_YZ;@JbGSG;@C >&p,:<;»=>@?BAlCLFPA(JIM&OUJg>GFÜ{IJ;@YmO FÜd=(YjG?BA(=9?];@f@S@?A*>¥=*>@JEA(JlJE{IJL;[=(ALpDq >@?BA/?BA =FIPJL;m?e;[=(YtFPCECEY@SG;I= ?e;Ö=>@JlA(d@A(=(JLRFP=9?ClJLK9KTYZKEp
´JA(JLFIKTCE>|F0HGJLF[¥O/>@?CE>zJEu@CEJEJEjÐ=>@Jm=>GKTJEA*>@YI~BjËHGS@~BA(J¥>@JE?BfZ>[=CEYZK(KTJEAHYZ;@jG?e;@f0=(YÐL[IHG>@YI=(YPª
JE~BJECE=KTYZ;@AwH&p JIpyEph?BfZSGKTJ,GpA>@YPO AQF_=TdGH@?CLF^~ Ä k,¦=>GKTJEA>@Y[~jmCLSGKT{IJ/YZK¤=>@J}h Ä k,¦HGJLFI\A(JE~BJECE=(?BYZ;&pq >@?BAU=>GKTJEA>@Y[~j?e;m=>@JlHGJLF[A(JLFIKTCE>`?A 0L[®0JE¯YZKDFI;`JE~BJECE=KTYZ;mFI;@jmCLFI;mKTJLRYP{IJ =>@J/CEYZ;[=FIR?e;GFÜª + N )(  $&'(.&'*  % &, K 

ØI

=(?BYZ;Ö¢KTYZR©ª¢jGJECLFÜd»JE~JECE=*KTYZ;@Agb[dCEYIAR\?C*ª K9FLd»A(=(YZHGH@?e;@f¥RS@YZ;@AlJL;[=(JLKT?e;@f¥nlq E(S@A(=$bJ*ÀY@KTJ=>@JbGJLFIRAH@?B~B~p¾oFPCE>|HGJLFI»?e;0=>@J`h Ä k,¦³A(?BfZ;GF^~D?BAgKTJEf@FIKTjGJEj|FPAgF[;¥JE{[JL;I=_?];´nlqlprq >@Jm;ZSGRbGJLKYPQ?e;[=(JLK(FPC*ª=(?BYZ;@Al?e;|FmbGJLFIR A*H@?~B~?AlCEY@SG;I=(JEj|FÜ=(JLKs=>@J_8KTA(=lKTJEj©S@CE=(?BYZ;|F[;@j=*>@JgA*H@?~B~BAO}>@?BC >»CEYZ;[=FP?e;0FmA(?e;@fI~BJ?e;I=9JLK(FPCE=(?BYZ;0FIKTJ_Ä A(JE~BJECE=(JEj2p/h?BfZSGKTJgpA*>@YXOsA =>@J;ZSGRbJLK YPQHJLFI[A,KTJECEYZKTjGJEj0bIdh Ä k,¦?e;0FmbGJLFIRAH@?B~B~rFI;@j=>@J/h k,¦¨HGJLF[=(?eRJ/jG?BA(=KT?ebGS@=(?BYZ;ÖYPr=>@J/A(JE~BJECE=(JEj»JE{IJL;I=9AQO/>@?CE>>GFÜ{IJ =>@JlCE~BJLFIKUØÜª bGSG;@CE>
A(=K9S@CE=SGKTJ,?e;»FAH@?B~B~FI;@j¥=>@S@A/fZSGFIK(FI;[=(JEJl=>GF^= =>@JgHJLFI[A}?e;»h Ä k,¦ ?A/YZKT?BfI?e;GFP=9JEj¢KTYZR£YZSGK/HGKTYI=9YZ;
bGJLF[R£O}>@?BC >0>GFÜ{IJ/=>@JgØXª bGSG;@C >»R?BCLKTYA(=K9S@CE=SGKTJIph?BfZSGKTJGp QqdGH@?CLF^~r=>GK6JEA>@YI~Bj0CLSGKT{IJYPDh Ä k,¦CLS@=,FPAlF¢SG;@CE=(?BYZ;»YPQ;@SGRgbJLK Y^DCEYI~B~JECE=9JEjÐHG>@YI=(YPª
JE~BJECE=KTYZ;@Alb[dt?e;G;@JLK/®|qUALp
 ,  lÕ QOHGÕ¢È&Ò Ì2Ò'OLÏ.HOÉ´J¥;@JEJEjv=>@JJE{IJL;[={IJLKT=(JEuzHGYIA(?B=(?BYZ;KTJECEYZ;@A(=*K(S@CE=(?BYZ;z=(Y0jG?BA(=(?e;@fZS@?BA>;@JLS@=KT?e;@Yz?e;I=(JLK9FPCE=(?BYZ;@A?e;nlq xKTY@R£?e;@CEYZR?e;@f¥bGFPCEIfZK6YZSG;@j¥JE{IJL;[=(ALp qs>@J,{IJLKT=9JEu¥HGYIA(?B=(?BYZ;Ö©=(=9?];@fRJE=>@Y@j¥?BAlbGFPA(JEj0YZ;FIK9KT?B{XFP~=(?eRJ ?e;[YZK(RF^=(?BYZ;YP2¦ >@JLKTJL;GPYP{~B?f@>I=UHG>@YI=(YZ;@AUFI;@j=>@JUAFIR\J}RJE=>@Y@jt>GFPADbJEJL;tS@A(JEjm?e;=>@J}GSGHJLK<ªnlFIR?BYZÜFI;@jGJgF^=RYIAHG>@JLK6?C;@JLS@=KT?e;@YFI;GFP~BdZA9?A eLI pqs>@JY@b@A(JLKT{IJEj;@JLS@=KT?e;@Y¨JE{IJL;[=(AFIKTJ|KTJEºGS@?eKTJEj=(Yv>GFÜ{IJ¥=>@JE?eKÖ{IJLKT=(JEu¨HYIA(?B=(?BYZ;?e;=>@J»©j©S@CE?eFP~{IYI~eSGRJmYP O}>@?BCE>|=>@JbGY@SG;@j©FIKTd0?BAgA9JE=l¢FIK/¢KTYZR =>@J?e;G;@JLK®|q"O F^~~JL;@YZS@fZ>0=9Y¥{IJE=(Y»?e;@CEYZR?e;@fbGFPCEIf@KTYZSG;@jJE{IJL;[=(ALpDqs>@J,CEd@~?e;@j©KT?BCLFP~©j©S@CE?eFP~{IYI~eSGRJIM&IR£?e;»K(FPjG?eS@A$F[;@j¥IR£?e;¥>@JE?BfZ>[=LM¹?A/jGJ*8;@JEj
FP~BYZ;@f_=>@J$bJLFIR¼F^uZ?BA FI;@j~eFP?Bj?e;=*>@J}SGH@A(=KTJLF[R¼>GFP~rYP2=>@J/nlq¨=*FI;G_=(YgFÜ{IYI?BjtR\?A6ª©=(=(?e;@fYP2{IJLKT=(JEu
HGY[A(?B=(?BYZ;@AYZK_YZS@=(fIYI?e;@f|RS@YZ;@Aw h?Bf©pG5p 4ZyNp|q >@J=(YI=F^~©j©S@CE?eFP~}RF^A(A?AmI=Lp|q >@J¥KTJECEY@;@A(=K(S@CE=(JEj{IJLKT=9JEu¨HGYIA(?B=(?BYZ; jG?A9=KT?ebGS@=(?BYZ;@AF^~Y@;@fv=>@J|>@YZKT?BÃEYZ;[=FP~lFI;@j¨{IJLK6=(?BCLFP~,FPu@JE%A E(S@A(=bGJ*YZKTJ0=>@J»©j©S@CE?eFP~{IYI~eSGRJ_CLS@=}FIKTJlA*>@YXO/;m?];Öh?Bf©pGpFI;@j¥F^fZKTJEJlO ?B=>mYZSGK ®Y@;I=(J*ª ¦sFIKT~BYA(?eRgS@~eFP=9?Y@;&p + N )(  $&'(.&'*  % &, K 

10

6

10

5

10

4

ØIß

12000

10000
10000

8000
8000

6000
6000
10

3

4000
4000
10

2

2000
2000

10
1

2

3

4

5

0
-200

0

200

400

600

800

1000

1200

1400

nsec

h?BfZSGKTJGpUÚ}SGRbJLK/YP¤HJLFI[A,KTJECEYZKTjGJEj0bIdh Ä k,¦ÂwÀ~J*=s©fZSGKTJLy/FI;@j¥=>@J_=(?eRJjG?BA(=KT?ebGS@=(?BYZ;»YPD=>@J
HGJLF[IAwKT?BfZ>[=©fZSGKTJLyEpDl;@~BdA(?e;@fI~BJHGJLF[JE{IJL;[=(A ?e;»FbGJLFIR¿AH@?B~B~ F[KTJlA(JE~BJECE=(JEjYZK F[;GFP~BdZA(?BALp
FADC npeak (2000/Jan-Mar)peaks/spill

FADC
FADC 1stpeak
allpeak time
time (2000/Jan-Mar)(2000/Jan-Mar)detector center

2m
ν

2m

h?f@SGKTJ,Gp54 q >@J_jGJ*8;@?B=(?BYZ;»YP2©j©S@CE?eFP~{IYI~eSGRJl?e;»nlq

20

events/ton/day

events/ton/day + N )(  $&'(.&'*  % &, K 
DATA
MC

18
16

20

16
14

12

12

10

10

8

8

6

6

4

4

2

2

-200

-100

0

100

X profile (2000/Jan-Mar)

200

300

cm

DATA
MC

18

14

0
-300

ØIØ

0
-300

-200

-100

0

100

Y profile (2000/Jan-Mar)

200

300

cm

h?BfZSGKTJGp YZK6?ÃEY@;I=F^~ w ~BJ*= ©f@SGKTJLylFI;@j0{IJLKT=(?BCLFP~ wKT?BfZ>[=s©fZSGKTJLys{IJLKT=(JEu»jG?A9=KT?ebGS@=(?BYZ;@A,Y^DYZb@A(JLKT{IJEj;@JLS@=KT?e;@Y»?];[=(JLK(F^CE=(?BYZ;@AgFP=,nlqp2q >@JYZHGJL;|bYPuZJEA_A>@YPO¶=>@J`j©FP=FFI;@j0A>GFPjGJEjzbGYPuZJEAlA*>@YXO½=*>@J®|¦A(?eRS@~eFP=(?BYZ;&pUq >@Jl{IJLKT=(?BCLFP~A(?BÃEJ,YPJLFPCE>bGYPutCEY@K(KTJEAHYZ;@jGA}=9Yg?B=(A/A(=F^=(?BA(=(?BCLFP~&JLK(KTYZKNp
 , Æ  È H,-ÍI"Ì ODÑ Qqs>@J\FÜ{IJLK9FPfIJg;@SGRbGJLK/YPQHJLFI[AgKTJECEYZK6jGJEj¸b[d¥h Ä k,¦ÁO}>@?BC >0JEu@CEJEJEj|=>@J=>GK6JEA>@YI~Bj°w :L[IH&p JIp
7 ´LIP®0JE¯£YZKFI;´JE~JECE=*KTYZ;Gy?BAtFIbYZS@=GpI^AH@?B~~U?e;@CE~eS@jG?e;@fvJL;I=(JLK6?];@fzbGFPC [fZKTY@SG;@jÐJE{IJL;[=(Aj©S@J=(Y0CEYIAR\?C*ª K9FLd@AYZKVPa0?e;@j©S@CEJEj°RS@YZ;@ASGH@A(=KTJLF[Rp Ä HGFIKT=YP/=>@J¾;@JLS@=*KT?e;@Y|CLFI;@jG?Bj©FP=(JEAtFXÀ=(JLK_=>@J©j©S@CE?eFP~U{IYI~eSGRJCLS@=_O FPAl{Z?BASGF^~~Bd|A9CLFI;G;@JEjËb[dHG>[d@A(?BCE?A9=(AFI;@j0YZSG;@jÐGp[¡ YPQ=>@JLR FIKTJYZSG;@j|=9Y
bGJV a ?e;@j©S@CEJEj?e;@CEYZR\?];@f¥RS@YZ;@A SGH@A(=*KTJLFIR£YPDnlqFI;@j¥R\?A E6S@jGfIJEj»YZ;m?e;[ª©j©S@CE?eFP~ª¢{IYI~eSGRJJE{IJL;[=}b[d{IJLKT=9JEutHGYIA9?=9?Y@;¥R?BATª©=(=9?];@f¹pQq >@J,bGF^C [fZKTYZSG;@jj©S@Jl=9YgCEY[AR?BC*ª K(FÜd¾RS@YZ;@As?AsJEA(=(?eRFP=(JEj=9Y\bJtIpr¡
YP=>@Jl=(YI=*FP~8;@JLS@=K6?];@YmCLFI;@jG?Bj©FP=(JEAs?];Ö=>@J/©j©S@CE?eFP~{IYI~eSGRJ,CEY@;[8K(RJEj¥b[d¾FIHGH@~Bd@?e;@ft=>@JlA*FIRJlCLS@= YZ;
K(FI;@jGY@R4=K6?f[fIJLKTJEj0j©FP=FmFPA,;@JLS@=KT?e;@Yj©FP=*FGpl:¢;0×ZSG;@JLØ[ØIØtF[;@j¸ÚsYP{8pLØ[ØIØtbJ*ÀY@KTJ=>@J?];@A9=FP~B~eFP=(?BYZ;
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JE{IJL;I=`=(YËK6JLRYP{IJjGJECLFÜdvJE~JECE=*KTYZ;JE{IJL;[=(A¢KTYZR ?];[ª¢CEY@R?e;@f¨CEYIAR\?C*ª K9FLd¨RS@YZ;@AÜpklJLFPj¨=(?eRJ
xFPCE=9YZKCLFIS@A(JEjb[dm=>@?BA A(JE~BJECE=(?BYZ;»?BA}~BJEA(A/=>GFI;0LLIIA(?e;@CEJg=*>@Jl=(YI=FP~¹JE{IJL;[=}K(FP=(Jl=*KT?BfIfIJLKTJEj¥b[d=>@Jl?e;G;@JL KUjGJE=(JECE=(YZK JEuZCEJLH@= =*>@J,G«2o=KT?BfIfIJLK?BA =Td§H@?BCLFP~B~Bd :Ü ÃIpq >@J_=(?eRJlO ?e;@jGYPO?BA A(JE= =9Y¥w }y [I  FP=U=>@?BA A9=FPfIJl=(YjG?BAH@~eFÜd=>@JljG?BA(=KT?ebGS@=(?BYZ;»YPDHGFIK(F[RJE=(JLKTAU=(YA(JE~BJECE=l;@JLS@=KT?e;@Y
JE{IJL;I=9A}S@A(JEj?e;=>@JÀY[~~BYPO ?e;@fmA(JE~BJECE=(?BYZ;&p
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



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

 P$% & %M # $&,$
p Do}wxIII;@AyT¨II2  [ 

L[

10

3

10

2

Number of events

Number of events

Do/wIII;@A*y/?AjGJ*8;@JEj¨FPA_=>@JRFPu@?]RSGR YP =(YI=*FP~D;ZSGRbJLK,Y^sHG>@Y[=(YPª¢JE~BJECE=KTYZ;@AYZb@A9JLKT{IJEj|?e;
= >@J?];G;@JLK_jGJE=(JECE=9YZKl?e;|FÖA(~B?jG?e;@fÐ[II;@A(JECO ?e;@jGYPO,pt:x=,?BAgK6JEº§S@?eKTJEjz=>GFP=,o}wI[I;@Ays?A_~eFIKTfIJLK=>GFI;IIp qs>@?A/CLS@= ?BAlFIHGH@~B?JEj0=(YmKTJEj©S@CEJ,~BYPOUª¢JL;@JLKTfIdbGFPCEIf@KTYZSG;@jJE{IJL;[=(AU¢KTYZR£f@FIRRFK(FÜd@A
xKTY@R4=>@JASGK9KTYZSG;@jG?e;@fKTY@CE¥FI;@j|A9YYZ;vwIIH&p JIp_CEYZK(KTJEAHYZ;@jG?e;@f¥=(Y¥F[HGHGKTYPuZ?eRFP=9JE~d0I®0JE¯
jGJLHGYIA(?B=(JEj´JL;@JLKTfIdGyEpgqs>@?AIII;@Al=9?]R\JgOs?];@jGYPO£KTJEj©S@CEJEAg;@YI?BA(Jm>@?=9A,O}>@?B~BJ¾^JEJLH@?];@f»=>@JA(?BfZ;GFP~>@?=9At>@?BfZ>&p¨h?Bf©pGpemA>@YPO A=>@J¥jG?BA(=*KT?ebGS@=(?BYZ;YP$Do/wII[;@AyÀYZK\=>@Jj©FP=F0FI;@j ÀYZK_=>@J»®|¦
AFIRH@~BJIp
10

3

10

2

10

1
0

500

1000
1500
2000
Total P.E. in 300ns (p.e.)

0

500

1000
1500
2000
Total P.E. in 300ns (p.e.)h?BfZSGKTJ,GpÝÚ}SGRbGJLKsYP=(YI=F^~ÅHG>@Y[=(YPª¢JE~BJECE=KTYZ;@As?];»III;@As=(?eRJlO ?e;@jGYPO¶?e;¥Gn ÀY@KDj©F^=F¥w ~BJ*=U©fZSGKTJLy
FI;@j»YZK/®|¦4wKT?BfZ>[= ©fZSGK6JLylFÜÀ=9JLK/=>@JjGJECLFLd0JE~BJECE=KTY@;¥CLS@=Üp,®0YIA(=lY^QSG;@A(JE~BJECE=(JEjÐJE{[JL;I=(Al?e;0=*>@J®|¦AFIR`H@~JFIK6Jgf[JL;@JLK(FP=(JEj|b[dÚ/¦?e;[=(JLK(FPCE=(?BYZ;@AÜM2O}>@?B~BJ=>@JEA(J?e;0j©FP=*FtFIK6Jl¢KTYZR¿=>@J~YPOUª¢JL;@JLK6fId¥JE{IJL;[=(A~B?ePJ,fZF[RRFK(FÜdZA xKTY@R¼=*>@J,KTYZCE¹p
pUhÄ ~]F^A>@JLKUCLS@=
=(JLK/=>@Jto}w[II;@Ay/CLS@=LMRYIA(=lY^Q=>@JtK6JLRFP?e;@?e;@f¸bGF^C [fZKTYZSG;@jzFPfZFP?e;@A(=_=>@JtbGJLF[R_ª¢?e;@j©S@CEJEj;@JLS@=KT?e;@YJE{IJL;I=9AQFIKTJ/;@YI?BA(J}JE{[JL;I=(ACLFP~B~BJEj·PÞ8FPA>@JLKT·_O}>@?BC >mFIKTJsCLFIS@A(JEjbIdFljG?BA(CE>GFIKTf[?];@f¤®¸qpl;@J,J*Û2JECE=(?B{IJlO FÜd=(YtKTJEj©S@CEJ_=>@J/Þ8FPA>@JLK6A ?BA}=>@J,K6JEº§S@?eKTJLRJL;[=/YP =*>@J/ÀYI~B~BYPO ?e;@ftCEY@;@jG?=9?Y@;t w[I  y  GO}>@JLKTJQo® Ä  ?A=*>@JQRFPu@?eRSGR½;ZSGRbGJLKYP8HG>@YI=9YPª¢JE~BJECE=KTYZ;@ADKTJECEY@KTjGJEjgb[d,YZ;@J?e;G;@JLKjGJE=(JECE=(YZK®|q4?e;³FI;JE{IJL;[=LpÂqs>@?A0KT<J ETJECE=(AJE{IJL;[=(A?e;O}>@?BCE>RF E YZK6?=TdvYP=(YI=F^~$HG>@YI=9YPª¢JE~BJECE=KTYZ;@A?e;=>@J?e;G;@JLKmjGJE=(JECE=(YZK`?BAtYZb@A9JLKT{IJEj¨?e;F|A(?e;@fI~BJ|®|qlpq >@J¥YI=*>@JLKRJE=>@Y@j¨?BAFP~BA(YËF[HGH@~?BJEj=9Y
JE~?eR?e;GFP=9Jl=>@JUÞ8FPA>@JLK6ALpD:=?BAQ=*>@J}AF[RJ}FPA=>GFP=DS@A(JEjm?e;m=>@J}FP=R\YIAHG>@JLKT?BCl;@JLS@=KT?e;@YFI;GFP~BdZA9?AU?e;GSGHGJLK<ª nlFIR\?Y@LFI;@jGJS@A(?e;@f=>@JlCE>GFIK(FPCE=(JLK6?A9=(?BCEA YPr=>@JsÞ8FPA>@JLK JE{IJL;I=U~B?ePJl=>@J,¤®¸q>@?B= =(?eR?e;@fjG?A9=KT?ebGS@=(?BYZ;0?e;|FmJE{IJL;[=Lplh&KTYZR ®0YZ;[=(J*ª ¦ FIK6~YmA(=S@jGdIM&=*>@JgJ mCE?JL;@CEd´jGJECLKTJLFPA(JEAbId»YZ;@~BdGpß[¡
xKTY@R¼=*>@JlA(?B=SGFP=(?BYZ;Ö?];ÖO}>@?BC >Ö=>@J/Þ8FPA>@JLKsCLS@= ?BAl;@YI= FIHGH@~B?JEj2pL[

 P$% & %M # $&,$

 ¹p @JE~JECE=s¢S@~~Bd[ª¢CEYZ;[=FP?e;@JEj¨w h ¦syDJE{[JL;I=(AÜpq >@J/;ZSGRbGJLK¤YPÅ>@?B= ®|qUA?e;=*>@J ~eFIKTfIJEA(=U>@?B=DCE~eS@A(=(JLK¤?];`=>@J Y@S@=(JLKjGJE=(JECE=(YZK/w/k,y?BAQKTJEºGS@?eKTJEj=(YbJt~BJEA(A=>GFI;LGpÖh?f@SGKTJ¾pA>@YPO A_jG?BA(=KT?ebGS@=(?BYZ;@AYZK=>@J¾;@SGRbGJLK_YP}>@?B=®|qUA,?e;z=>@J~]F[KTfIJEA(=/k >@?=CE~eS@A(=9JLKEp½®0YIA(=Y^gCEYIAR\?C*ª K9FLd¨RS@YZ;JE{IJL;[=(AFIKTJ0KT<J E JECE=9JEj¨¢KTYZR­=>@J0j©FP=FpR}<J ETJECE=(JEjmJE{IJL;I=9A ?e;m=>@Jl®|¦¨A*FIRH@~BJ,FIKTJl;@JLS@=KT?e;@YPª¢?e;@j©S@CEJEj|YZS@=6ª¢fIYI?e;@fRgS@Y@;mJE{IJL;I=9AD¢KTYZRc=>@J?];G;@JLKsjGJE=(JECE=(Y@KEp
Number of events

4

10

10

4

10

3

10

2

2

10

10
1
1
0

50
100
150
200
Number of hit PMTs in OD clusterh?BfZSGKTJGp }q >@Jt;@SGRbGJLK/YP ®|qUAl?e;0=>@J~eFIKTf[JEA(=,/k4>@?=_CE~eS@A(=(JLK/jG?BA(=KT?ebGS@=(?BYZ;´YP Gn£JE{IJL;[=(A/ÀY@Kj©FP=FwÀ~J*=yFI;@jYZK®|¦wKT?BfZ>[=yFÜÀ=9JLKÞ8FPA>@JLKCLS@=Üp R/<J ETJECE=(JEjtJE{[JL;I=(A?e;`=>@J ®|¦vA*FIRH@~BJ$F[KTJ ;@JLS@=KT?e;@Y?e;@j©S@CEJEj0YZS@=Tª¢fIYI?e;@ftRS@YZ;mJE{[JL;I=(AÜMGO}>@?B~BJ,=>@YIA9JlYP =*>@Jlj©FP=FFIK6JlCEYIAR?BC*ª K(FÜdRgS@Y@;mJE{IJL;I=9ALp
p @JE~JECE=/=>@JlJE{IJL;[=(A O/>@?CE>¥>GFÜ{IJ,F[;KTJECEYZ;@A(=K9S@CE=(JEjJE~BJECE=KTYZ;[ª¢JEºGS@?B{XFP~BJL;@=lJL;@JLKTfId [®0JE¯q >@JJE{IJL;[=(A,FIKTJKTJEºGS@?eKTJEjz=(Y¥>GFÜ{IJFI;0JL;@JLKTfId»~eFIKTfIJLK=>GFI;0IP®0JE¯½YZKlFI;¸JE~JECE=*KTYZ;&pt:<;@A(=(JLFPj
YP2=(YI=FP~©;@SGRbGJLKYP HG>@Y[=(YPª¢JE~BJECE=KTYZ;@AÜMZ=*>@J$KTJECEY@;@A(=K(S@CE=(JEjmJL;@JLKTfId`?AUJLRH@~BYPdIJEj2M©F^AD?B=U=FIPJEA?];[=(YFPCECEYZSG;[= =>@J{IJLKT=(JEuHGY[A(?B=(?BYZ;&M&O FP=(JLKU=K9FI;@AHGFIKTJL;@CEd¥F[;@j¥A(YmYZ;&p h?BfZSGK6JgGp\A>@YPO A}=*>@JgKTJECEYZ;[ªA(=K(S@CE=(JEjJE~BJECE=K6YZ;[ª¢JEº§S@?B{PFP~BJL;@=,JL;@JLKTfIdjG?BA(=*KT?ebGS@=(?BYZ;0YPh ¦ JE{IJL;I=9A}O ?B=>@?e;zL &A/=(?eRJ,O ?e;@jGYPO,pp @JE~JECE=/=>@JlJE{IJL;[=(A ?e;@A(?BjGJF=(?BfZ>[=(JLKU=9?]R\JlO  ?e;@jGYXO½S@A( ?e;@f»i$D&pq >@J|A(JE~BJECE=(?BYZ;ÁfZFP=(J0?BA¥A9JE==(Y G  ¥w }y Ä I pch?f@SGKTJÐG5p 4vA*>@YXOsA=>@J ¥w /yjG?A9=KT?ebGS@=(?BYZ;FP={XFIKT?BYZS@AA(=FPf[JEADYP2=>@J}K6JEj©S@CE=(?BYZ;&p CE~BJLFIKUHGJLF[CEYI?e;@CE?BjGJL;I= Os?=*>=>@J/;@JLS@=KT?e;@YbGJLFIRc¢KTYZR¿nloDnsª DÖ?BA}YZb@A9JLKT{IJEj¥?e;Ö=>@J,FI;GFP~Bd@A(?BAl=(?eRJlfZFP=(JIp 4Zh¦JE{IJL;[=(A}FIKTJlY@b@A(JLKT{IJEj?e;=>@Jl?e;G;@JLK jGJE=(JECE=9YZK,wI[I=(Y@;GyEp
p Ä@JE~JECE=/=>@JlJE{IJL;[=(A ?e;Ö=>@J/©j©S@CE?eFP~{IYI~eSGRJIp
©j©S@CE?]F^~{IYI~eSGRJCLS@=l?BA$FIHGH@~B?BJEjvFPCECEJLH@=(?e;@fYZ;@~Bd¥JE{IJL;[=(A/O ?B=>Ö©=(=(JEj»{IJLKT=(JEu¥HYIA(?B=(?BYZ;»?e;@A(?BjGJ=>@JAFIRJIGD[=U©j©S@CE?eFP~D{IY[~]SGR\J\F^A,S@A(JEj|?e;0=>@JGn£FP=RY[AHG>@JLKT?BCt;@JLS@=KT?e;@Y0FI;GFP~BdZA9?AÜpgq >@J
bGYZSG;@j©FIK6dtYP=>@J ©j©S@CE?eFP~{IYI~eSGRJ/?BA A(JE=}F^= RJE=9JLKDjG?BA(=*FI;I=¢KTYZRc=>@J,;@JLFIK6JEA(=U?];G;@JLK jGJE=(JECE=(YZK
0

50

100

150

200

L[ß

 P$% & %M # $&,$
Number of events

Number of events 

2

30

20

1
10

0

0

100

0

200
300
Visible energy (MeV)

0

100

200
300
Visible energy (MeV)

eventsh?BfZSGKTJtpR/JECEYZ;@A(=K9S@CE=(JEj|JE~BJECE=KTYZ;[ª¢JEºGS@?B{XFP~BJL;[=JL;@JLKTfId´jG?A9=KT?ebGS@=(?BYZ;@AYP}Gn£h¦½JE{IJL;[=(A/YZKlj©FP=*F
w ~BJ*=ylFI;@j0YZK/®|¦4wKT?BfZ>[=y/FÜÀ=9JLK/=>@J©j©S@CE?eFP~D{[YI~eSGRJCLS@=Lp®0YIA(=/YP =>@JSG;@A(JE~BJECE=(JEjzJE{IJL;[=(A,?e;0=>@J®|¦AFIR`H@~J,F[KTJ,Ú}¦ JE{IJL;I=9ALp
3

10
2
10
10
1
-500

events

10
8
6
4
2
0

-250

0

250

500
∆(T) µs

Selection gate

-5

0

5
∆(T) µsh?BfZSGKTJGp54 _q >@Jt=9?]R\JjG?ÛÅJLK6JL;@CEJ ¥w }yjG?A9=KT?ebGS@=(?BYZ;vFP=lJLFPCE>´A(=(JLH0YP =>@JmJE{IJL;[=,A(JE~BJECE=(?BYZ;&pvw =(Y@HGy¥w /y jG?BA(=K6?]bGS@=9?Y@;0YP{IJLK}F lII&A}O ?e;@jGYPO,p,@Y[~?BjÐ>@?BA(=9YIfZK(FIR\A}A>@YPO³=>@JJE{IJL;[=(A$FXÀ=(JLKs=>@JjGJECLFÜdIª
JE~BJECE=KTYZ;_CLS@=QwÀCLKT?B=(JLKT?BYZ;mLyEp }FP=9C >@JEj>@?A9=(YIfZK(F[RA2A>@YPO|=>@JJE{IJL;[=(A FXÀ=(JLKÅ=>@JDJL;@JLKTf[dlCLS@= w CLK6?=9JLKT?BYZ;,IyNp
G>GFPjGJEjt>@?BA(=9YIfZK(FIR\AA>@YPOÐ=>@JsJE{IJL;I=9ADFÜÀ=9JLK&©j©S@CE?eFP~&{IYI~eSGRJUCLS@=lw CLKT?B=(JLKT?BYZ; 4@yEprl;@J Y^Û8ª¢=9?]R\?];@flJE{[JL;I=FIKTY@SG;@j lL[  ?AU=>@Y@S@fZ>I==(YbGJlFI;mFP=RYIA*HG>@JLKT?BC$;@JLS@=K6?];@Y`JE{IJL;I=Üp qs>@J}CLS@=UCLKT?B=(JLKT?eFF[KTJ jGJEA(CLKT?ebJEj?e;v=>@J»=(JEu@=Lp¶wbYI=(=(YZR`ygo¤u§HGF[;@jGJEj°{@?BJEOY^ ¥w }yjG?BA(=KT?ebGS@=(?BYZ;O ?B=>@?e;F l8A`O ?e;@jGYXO¿YZKh¦
JE{IJL;[=(A O ?B=>m=*>@JE?]Ks{IJLKT=9JEu¾HYIA(?B=(?BYZ;?e;Ö=>@J/©j©S@CE?eFP~{IYI~eSGRJIp
4L[Ø

 P$% & %M # $&,$
Number of events

Number of events 

1000

3

2

750

500

1
250

0

0

500
1000
1500
Distance from the nearest wall (cm)


0

0

500
1000
1500
Distance from the nearest wall (cm)h?BfZSGKTJGp q >@JmjG?BA(=KT?ebGS@=(?BYZ;zYP jG?BA(=F[;@CEJmxKTY@R=>@J©=9=(JEjÐ{[JLKT=(JEu|HGYIA9?=9?Y@;z=(Y¥=>@J;@JLFIKTJEA9=,?e;G;@JLK
O FP~B~&YZKj©FP=F¥w ~BJ*=y FI;@jmYZKU®|¦½wKT?BfZ>[=yEp
O F^~~p`h?f@SGKTJtGpmA*>@YXOsA,FmjG?A9=KT?ebGS@=(?BYZ;zYPUjG?A9=FI;@CEJ`xKTY@R =>@J©=(=(JEj´{IJLKT=(JEu0HGYIA(?B=(?BYZ;´=(Y=>@J;@JLFIKTJEA(= ?e;G;@JLKsjGJE=(JECE=(YZK O F^~~pßp @JE~JECE=/A(?e;@fI~BJ*ª KT?e;@fJE{IJL;[=(Aq >@J}JE{[JL;I=(AUO}>@?BCE>>GFÜ{IJ}Y@;@~dmYZ;@Jl¦ >@JLKTJL;GPYP{tK6?];@fFIK6J}A(JE~BJECE=(JEj»=(Y,JL;G>GF[;@CEJg¦ ¦ º§SGFPA9?ª¢JE~eFPA9=(?BC?];[=(JLK(F^CE=(?BYZ;zJE{IJL;[=(ALp|q >@J¥;@SGRbGJLK_YP$¦ >@JLK6JL;GPYP{ÐKT?e;@fIAtFIK6J¾KTJECEY@;@A(=K(S@CE=(JEj¨F[;@jÐCEYZSG;[=(JEj¨b[d=>@J}A*FIRJ,HGKTYIf@K(FIR£FPA S@A(JEj?e;=>@J,Gn½F^=RYIAHG>@JLK6?C,;@JLS@=*KT?e;@Y¾FI;GF^~d@A(?BA eÜI@M2LI ph?BfZSGKTJ,Gp
A>@YPO ADFljG?BA(=K6?]bGS@=9?Y@;YP&=>@J$;@SGRbGJLKYPrKT?e;@fIAYP2=>@J}A9JE~JECE=9JEj¾bJLFIR_ª¢?e;@j©S@CEJEj¥h¦vJE{IJL;[=(ALpq >@J®¸¦KTJLHGK6YZj©S@CEJEA/=>@J,j©F^=F_OQJE~B~rFXÀ=(JLKs;@YZK(RFP~B?BÃLFP=(?BYZ;&pØp @JE~JECE=/J*ª¢~B?ePJJE{IJL;I=9A O ?B=>mJE~BJECE=KTYZ;ÖJL;@JLKTfId0LIP®0JE¯h?];GF^~~BdIMOQJKTJEºGS@?]K6J=>@JA(?e;@fI~BJ¦ >@JLKTJL;GPYP{K6?];@f?e;0FmA(JE~BJECE=(JEj0JE{IJL;[=lA>@YZS@~Bj|bGJ?BjGJL;[=(?©JEjÐFPA
J*ª¢~?ePJIMU?p JIp CLFIS@A(JEj¨b[dÐJE~BJECE=KTYvRFPf@;@JE=(?BCA>@YPOQJLK6AgY^$O}>@?BCE>vjGJLHYIA(?B=tJL;@JLK6fIdÐ?BA~eFIK6fIJLK=>GFI;LIP®0JE¯ b[d¨=>@J|A*FIRJ|HGFIKT=(?BCE~BJ|=TdGHGJ|:k HGK6YIfZK(FIRFPA¥S@A(JEjÁ?];ÁGn FP=RY[AHG>@JLKT?BC|;@JLS@=KT?e;@Y
FI;GFP~BdZA9?A eLI@MGLI p2h?BfZSGKTJ/GpsA>@YPO ADFlHGFIKT=(?BCE~BJ/= dGHGJs~?ePJE~B?e>@Y@YZjjG?BA(=K6?]bGS@=9?Y@;tFPA9A(?BfZ;@JEj=(Yl=>@J¦ >@JLKTJL;GPYP{lKT?e;@f}?e;l=*>@JDA(JE~BJECE=(JEjbGJLF[R_ª¢?e;@j©S@CEJEjh ¦¸JE{IJL;I=9A2=(YIfIJE=*>@JLK&=>@JQbJLFIRÁ®¸¦´HGKTJEjG?BCE=(?BYZ;&MO}>@JLKTJFHYIA(?B=(?B{IJÐw;@JEf@FP=(?B{IJLy_~B?]^JE~?e>@Y@YZjCEYZK9KTJEAHGY@;@jGAg=9Y ¹ª¢~B?ePJÐw J*ª¢~B?ePJLyJE{IJL;[=(ALp0h?BfZSGK6J¾GpßA>@YPO A=>@J¥JEuGHGJECE=(JEjJL;@JLKTfIdvjG?BA(=K6?]bGS@=9?Y@;¨Y^}=>@J¥A9?];@f[~J*ª K6?];@fvJ*ª¢~B?ePJ0®|¦£JE{IJL;[=(ALp¨qs>@J~YPOUªJL;@JLKTfIdfZF[RRFÜª K(FÜdJE{IJL;[=(A}HGKTY@j©S@CEJEjb[dtÚ/¦?e;I=9JLK(FPCE=(?BYZ;@A CLF[;bGJlJE~B?eR?e;GFP=(JbId`=>@JLIP®0JE¯JL;@JLKTfIdm=>GKTJEA>@YI~Bj»CLS@=Lp
Ú/SGRbGJLKUY^rA(JE~BJECE=(JEj¥JE{[JL;I=(A FP=UJLFPCE>KTJEj©S@CE=(?BYZ;ÖA(=(JLH`?BA}ASGR`RFIKT?BÃEJEj?e;¥qFIb@~BJ,GpeIpq >@J,;@SGRbGJLKYPA(JE~BJECE=(JEj¶JE{[JL;I=(Am©=9=(JEj?e;=>@J0©j©S@CE?eFP~{IY[~]SGR\J|?e;@j©S@CEJEj b[d=>@J|;@JLS@=KT?e;@YIA|HGKTY@j©S@CEJEj¶bId=>@J
FPCECEJE~BJLK(FP=9YZKFP=tnlon?BAIßGp¨o¤u§HJECE=(JEj;ZSGRbGJLK`YP,bGFPCEIfZK6YZSG;@jvJE{IJL;[=(Aj©S@J¥=9Y|=>@JF^=RYIAHG>@JLK6?C
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 

Nring F.C. 22.5kt MC

30

20

10

0

2

4

6

8

10

h?BfZSGKTJtp }Ú/SGRbGJLKYP ¦ >@JLK6JL;GPYP{KT?e;@fIA_jG?A9=KT?ebGS@=(?BYZ;´YPQ=>@J`A(JE~BJECE=(JEjËbJLFIR_ª¢?e;@j©S@CEJEjvh¦JE{IJL;[=(AYZKUj©FP=FwÝ©~B~BJEj0CE?eKTCE~BJEAlO ?B=>FI;mJLK(KTY@K bGFIK(yUFI;@jÖÀYZK®|¦¼w A9YI~B?j0>@?BA(=(YIfZK9FIRAyEp
PID distribution 22.5kt 1-ring MC
15

10

5

0

-10

-5

0

5

10
likelyhoodh?BfZSGKTJtp,FIK6=(?BCE~J`= dGHGJ`~?ePJE~B?e>@Y@YZjjG?A9=KT?ebGS@=(?BYZ;zYPU=>@JA(JE~BJECE=(JEj¨bJLFIR_ª¢?e;@j©S@CEJEjvh ¦³A9?];@f[~J*ª K6?];@f
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60
40

selected

20
0

0

200

400
600
Evis (MeV)

800

1000

800

1000

40

selected

20
0

0

200

400
600
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JL;@JLKTfIdFI;@jjG?eKTJECE=(?BYZ;ÖYPr=>@J,K6?];@f`?];m=*>@?AsJE{IJL;I=s?A/IØU4I®0JE¯FI;@j|LGp 4gjGJEf@KTJEJEAU¢KTYZRc=>@JlbGJLFIR4F^uZ?BALMKTJEAHJECE=(?B{IJE~BdIpDq >@J KTJECEYZ;@A9=K(S@CE=(JEj_jG?]K6JECE=(?BYZ;YP©=>@?BAJE{IJL;[=?ACEY@;@A(?BA(=(JL;[=rO ?B=>_=>GF^=2YZ;l=*>@J F^A(ASGRH@=(?BYZ;YPDFt;@JLS@=*KT?e;@YPª ;@JLS@CE~BJLFPYZ;0A(CLF^=(=(JLKT?e;@f©MG?e;»O}>@?BCE>=>@J_{XFIKT?eFI;@CEJYP=>@J;@JLS@=KT?e;@YPª ;@JLS@CE~BJLFPYZ;0A9CLFP=(=(JLKT?e;@f
FI;@fI~BJw ! yU?BA}FIHGHGKTYPu@?eRFP=(JE~Bd 4Z_jGJEfZKTJEJFP= IIP®0JE¯p P$% & %M # $&,$

    !" #$&% ' $()$&*+##, -$&!".&0/213+ "$(4 )56'%$& .7+.('!"
+8*96:";

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 

IÜ

NUM
1
RUN
8071
SUBRUN41
EVENT 5487540
DATE 99-Nov- 6
TIME
15:17: 5
TOT PE:
5647.4
MAX PE:
39.2
NMHIT : 2116
ANT-PE:
31.5
ANT-MX:
9.8
NMHITA:29

90/00/00:NoYet:NoYet
90/00/00:NoYet:NoYet
90/00/00:NoYet:NoYet
90/00/00:NoYet:NoYet
90/00/00:NoYet:NoYet
90/00/00:;R= 0:NoYet
R :Z : PHI : GOOD
0.00: 0.00: 0.00:0.000
CANG : RTOT : AMOM : MS

Comnt;

RunMODE:NORMALTRG ID :00000111
T diff.: 644.
us
FEVSK :81002803
nOD YK/LW: 2/ 3
SUB EV : 0/ 0
Dec-e: 0( 0/ 0/ 0)
CT:
1203
SKGPS: 941869024 s
928500545ns
RN: 2150SP:
0PSGPS: 941869024 s
927674769ns
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