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5cm Liquid Deuterium
e−
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883MeV 10uA 80% polarisation
Spectrometer B 111111111111 000000000000 000000000000 111111111111 000000000000 111111111111 000000000000 111111111111 000000000000 111111111111 000000000000 111111111111 000000000000 111111111111 000000000000 111111111111 000000000000 111111111111 90.0°
Pb 000 111 0000000 1111111 111 000
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50
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x−y position L
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signal wire t3 z3
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20
40
60
80
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100
120
140
160
180
20
40
60
80
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100
120
140
160
180
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8
6
4
2
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n
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S
S
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B
B
B
B
B
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17Ω
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55ns
N2−2
55ns
N2−1
55ns
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48ns
72ns
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S
C
C
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S
S
S
S
S
S
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C
C
C
C
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C
C
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Horizontal Detector
C
C
C
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Twist & Flat
A
100ns
83.5 ns
H
3μ
Increased from 0.9 to 3.0μ s add 222
S
S
I
I D
8ns
G
G
4 lines
4 lines
QDC Analogue (0−47) Gate Clear
CLK
F 100 n
F 300μ
60 m
E (from A)
Interrupt
System busy return to Spec. A
INT 2
Event Counter
Times at inputs to main coincidence A viewed in Messraum via TM lines XA: Spec. A = 0 ns XB: N1 OR = −(31 to 37) ns XC: N2 AND = −(22 to 36) ns XD: N2 Veto = −(60 to 74) ns
24.5ns total
Key A: LeCroy 364 AL B: LeCroy 4413 CAMAC C: LeCroy 4516 CAMAC D: LeCroy 622 NIM E: LeCroy 429A NIM F: LeCroy 222 NIM G: LeCroy 4616 H: LeCroy 365 I: KPH NIM CFD
Coincidence A may be configured AND/OR and inputs A−D turned ON/OFF
E
20.5ns
D
180ns
Reference detector anode output + 30 m RG58 T0 T0 = T0 +76 T1 = T0 +45 T2 = T0 +37 T4 = T0 +76 Fast Clear D E 21.5ns 50ns Start for N1−1,2 TDC (from A) TDC E 10ns D clear stop Interrupt inhibits 40ns fast clear E D μ Busy F
83.5 ns
Npol coinc. return A
XA XB A XC XD Veto
Spect.A "TOF" Scint (before & of planes)
2nd wall vetos not in tigger
QDC
Attenuate
200 ns
B
B
B
B
B
B
B
B
All Channels
C
Swap ECL polarity for NOT V1
All polarimeter channels
common start
55ns
delay
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G
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%
!
0 /
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$ D'
DE
7000
10000
6000 8000 5000
6000
4000
3000 4000 2000 2000 1000
0 400
420
440
460
480
/ E e(MeV)
0 1.48 1.5 1.52 1.54 1.56 1.58 1.6 1.62 1.64 1.66
500
/
θe(rads)
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5 &
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$
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B &
H
Cross section / barn
10
10
1
-1
10
1
-2
10
0
5
10
15
20
25
30
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10
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10
0
100
200
300 400 500 Neutron kinetic energy / MeV
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F > DC? +!(2 ,D - C ? & > C' ? +!(2 D 4 2 > C''? H 2
&
) % $ % % K%
L / 9
/ &
+ H'
dσ dθCM
12
50MeV 100MeV 150MeV 200MeV 400MeV
10
8
6
4
2
0 0
20
40
60
80
100
θCM
120
140
160
180
/ DCO %
7
&& ,HE-
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Potential well of the proton in the Carbon Sp=Separation Energy Ex=Excitation Energy
Ex
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¼
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T e(MeV)=T p(MeV ee)
50
40
30
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-0.1T 0.9 p
)
20
10
0 0
10
20
30
40
50
60
T p (MeV)
/ DHO 8
"# "# > $ ? A$ DB DH !! % ( +
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-0
-0.05
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0
20
40
60
80
\
100
120
140
160
180
φn
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>
? 4 > ? $ CE $ % !
2 DE
# $ ) K L ! ( & Q > ? > ? $ % Q
$ 2)
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Threshold r1
time
r2
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$
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A
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Æ
HE
Pulse Height (channels)
Pulse Height (channels)
8000
8000
7000
7000
6000
6000
5000
5000
4000
4000
3000
3000
2000
2000
1000 20
1000 22
24
26
28
30
32
34
36
38
40
20
22
Time (ns)
24
26
28
30
32
34
36
38
40
Time (ns)
/ DGO & % & & % ' > ?
O
A 1 A Æ
& A F Æ
! $
4 > ? > ? 4 > C'B? N 4 4 H
& $
% >% 2) ? 2) $ O
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Lightguide Photomultiplier
L x1
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Plastic Scintillator
x0
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?
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8 ! 7 Q
(
! % Q O
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Q & Q
" ! & % / D'' Q Q & 4
Æ
Æ
E'
10000
8000
6000
4000
2000
0 -30
-20
-10
rel
0
10
20
30
Tof 12 -Tof 12 (ns)
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Q & 4 & D ! # + % 2 ! %
& I2) O . .
& *A! C
> D'B? ! D'C "# & & "#
#
!
4
C >$ CH?
C ! !" 9> #( ?
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EB
53
5100 500 350 400
300 250
300 200 200
150 100
100 50 0
4000
1
6000
0 20
8000
30
40
50
60
70
80
90
1
Edep(channels)
E dep(MeVee)
/ D'BO
> ? > ?
C
/
#=
>DE?
< > DCF? Q ! % . "
#= ,ED- & >
&? 2 >
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' G
C P M W EF
280 Y
330
260
330 Y
220
210
α
157 X
Z
280
1000
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> ? Q 4 % 4 % 4 B ! 4
'
: B ,DB-
EC
# * + ):8!SS "!"( !' / + ! ,EB- : ):8!SS &
:: ,HF- !
$ ! $$ !
):8!SS
I2) 2) 5 =
= !2) 2) ! = = KL O
& 2) I2) K QL K QL
I2) &
4
I2) . . & 2) > DBF? 2) Q O
+ ! ! !
! & + ! ! !
# -99 &: "
ED
!
?. ?. ?
2
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6 & X
( Q
( Q
Q > DF?
KL
( O Q U Q EH
No Spectrometer cut
Spectrometer AOK cut
95
95
94
94
93
93
92
92
91
91
θe 90
θ e 90
89
89
88
88
87
87
86
86
85 0.4
0.42
0.44
0.46 / Ee
0.48
0.5
0.52
85 0.4
0.42
0.44
0.46 / Ee
0.48
0.5
0.52
/ D'CO % !:7 ( Q :: & !
+ CC ):8!SS D'C > ? > ? K!:7L !:7 O
& ; = ) & 6 ( $ / &
!
0
:: $$ 2
EE
& &
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= (
& ( ! $$ $ / 0 ! $$ D'
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:! ( ' ' >T ? :! ( B B >T ? ) + SU 9 2 9 9 2 9 D'O
EG
Gaussian fit to the precession angle χ for magnet current of +400A 300
Constant = 231.2 ±
250
11
Mean
= -52.46 ± 0.04764
Sigma
= 1.528 ± 0.05631
200
150
100
50
0 -80
-70
-60
-50
-40
χ
-30
-20
-10
0
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6 ! > DCF?
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5 : 9 5 9
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Edep(channels)
1
E dep (MeV)
6000
120
5000 100 4000 80 3000 60 2000 40 1000 20
0 0
0 0 5
10
15
20
25
30
35
40
45
1
20
30
40
50
40
50
t 2(ns)
60
70
E 2dep(channels)
Edep (MeV)
6000
120
5000
100
4000
80
3000
60
2000
40
1000
20
0 0
10
50
t 1 (ns)
5
10
15
20
25
30
t 1 (ns)
35
40
45
0 0
50
10
20
30
t 2(ns)
60
70
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) ! ( & > DD'?
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! ; > ; /5 = &
##
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?> ? /
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: $ 2 : B 2 > ? 2 :
( > ? :& 2 : $ 2 2 Æ
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N(φ’n) h=_1
Æ
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2X
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B
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% N # 2 2
O
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!
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) for Mag. Field +400A Fit to A(φ ¼
0.4
Mag. Field -400A Fit toA( φ ) for ¼
n
0.4
n
X=0.1599
X=-0.1234
0.3
0.3
0.2
0.2
0.1
0.1
-0
-0
-0.1
-0.1
-0.2
-0.2
-0.3
-0.3
-0.4 0
20
40
60
80
-0.4 0
100 120 140 160 180
20
40
60
¼
80
100 120 140 160 180
¼
/ D' O ! 2
P
' ' 1 9 ) 2 $ D' O
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# 3 3
# 3 3
Æ 4 3 4 3 3
4 3 4 3 3
Æ
B 2
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% O
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>D'B?
A &
! D' 2 4 Æ
!! 4
< Q ( # . 2 > C
PR
80 70
(d) 60
(d) (a)
(b)
50
t2 40
RP (e)
30
(c) 20
(d)
(d)
10 0 0
5
10
15
20
25
t1
30
35
40
45
50
/ D'GO Q B ' & > ? = 0 0 & ? # =
O
)%
# " "
# " "
2
2
)%
)% ##
# #
>D'F? >D'C? >D'D?
" "# " A$ D'C
&
(
& )% %
9 4 $ D'F % / D'G Q 4 >? >0? >? >0?
D
>00? >? >? ! >? / % >0 0 ?
Q & A DB O
/ 0 >? Q
& B *
> >??O
/ 0 >? Q % C
% & & F & *
8 D > >?? O D
/ $ /
> D'G? F & *
> >??O >? &
2 Q + ; & & & ! &
< ! = & & ! $ ! & & & ! ! 4
¼
¼
¼
H
450
Fit for RP background
Fit for PR background (i)
400
(ii)
300
350 250 300 200
250 200
150
150
100
100 50
50 0 0
5
10
15
20
25
30
35
40
45
0 -40
50
t1 Fit for RR1 background
-30
-20
-10
0
10
20
30
t2 Fit for RR2 background
500
40
(iii)
(iv)
35
400 30 25
300
20 200
15 10
100 5 0 0
5
10
15
20
25
30
35
40
45
0 -40
50
-30
-20
-10
t1
0
10
20
30
t2
/ DB O / Q & >? = >? D'G >? = >? >? = >? >? = 2
& O " !
A" $ 5 A" Q Q F" F"
> DB ? &
! !' % 2 >$ D' ? &
: O
: E
PP PR RP PR+RP-RR PP-(PR+RP-RR)
500
400
300
200
100
0 0
20
40
60
80
100
φ ’n
120
140
160
180
/ DB'O ! & 2
! 2 %
>00 0 0 ?
:
$ D'
9
&
)%
)% >$ D'C?
DBB
#% $ + BF
$ ( 9 > ? $ & > $ BFD? (
0.02 NN
0.015
NP
Aran
0.01 0.005 0
-0.005 -0.01 -0.015 -0.02
-60
-40
-20
0
o
χ( )
20
40
60
/ DBBO & )% 0
xn
xq
yq zq
e’ q
yn
pn P
zn φR
θnq
e SCATTERING PLANE REACTION PLANE LAB
/ DBFO
1 0 1 0
G
!# 5 $
2 /
' > DBF? 4 $ F'FF 4 'O
0
' 1 0 0 ' ' 1 0
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# $ %
2
6
&
2 ' 6 2" ( G 6 >D' ? 6 "
2
& ' (
6
6 "
6 "
2" 6 < ,EH-O
6
'
G
450
160
400 140 350 120 300 100 250 200
80
150
60
100
40
50 20 0 0
1
2
3
4
5
θ nq
6
7
8
9
0
10
-150
-100
-50
0
φR
50
100
150
/ DBCO 2 2" > DBF? 2500
NN
NP
1000
2000 800
1500 600
1000
400
500
200
0 -0.1
-0.05
0
0.05
0 -0.1
0.1
f
-0.05
0
0.05
0.1
f
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0
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$ C .. > CDB? 5 $ D' O
Æ
)
*
& .. & & G ' .. ' ' 6 2" (
4 6 2" % /
$ 6
6 2" / DBC 2" / DBD 0 0 G'
γ∗
γ∗
n
n p
n (p)
n p D
D
p
p (n)
FSI
Born γ∗
p
n p
πο(π−)
γ∗
n
n p
π D
Δ D
n
p
IC
MEC
/ DBHO % $ 9 O /+( O "A) O () O !#
4+ 20 . ( 6
0 < ( ! >0<(!? >/+(? >"A)? >()? > DBH? ( ! R ,B - >#
? (
0 < 9 ! >$ ?
$ FC
& '
& '
%
& '
$
& '
#
C
Æ
.
% ! ! 2 ! = ! ! ! 3 !
GB
NP
NN 6000
2500
5000 2000 4000 1500 3000 1000 2000
500
1000
0 -0.05 -0.04 -0.03 -0.02 -0.01
0
0.01
0 -0.05 -0.04 -0.03 -0.02 -0.01
0.02
0
0.01
0.02
ΔR p
ΔR p
/ DBEO 2 . /+( "A) () % > DBH? / / 9 & 'D ,DB- . DBE & . . 0
GF
" # $ %
! ! *
#
D
4 C > & ( ? ' $ D'H $ .. C /
C
) C & C
C !
. O Æ
Æ
& C
C C
>H'? C
+ $ D'B
C O
Æ
Æ
) C
C C Æ
C
! ) C C GC
Æ
11.84 / 5 χ 2 / ndf p0 -0.08271 ± 0.004397 p1 -6.73 ± 1.977
0.15
2.579 / 5 χ2 / ndf p0 -0.1148 ± 0.006697 p1 -8.082 ± 2.217
0.1
NN NP
A
0.05
0
-0.05
-0.1
-0.15
-60
-40
-20
0 o
χ( )
20
40
/ H'O !
60
>? 0> ?
:: "
)A & "( 5( ,EE- $ 0 ) C H' 0 !
C
C 6
) C % &
"J > CB? B ' > CF? ! ) *
>$ F'FF? * & ' & '
Æ
GD
C
0
B
Æ
Æ
#
. .
3
DD' / HB HF
0 /
BD 0 / &
! & $
/ 0 $
&
%
% H'
HB . .
% , !
C
O Æ
' % $ F'FF GH
2 3.088 / 5 χ / ndf p0 -0.1313 ± 0.008717 p1 -9.442 ± 2.597
0.15
2 2.579 / 5 χ / ndf p0 -0.1148 ± 0.006697 p1 -8.082 ± 2.217
0.1
No Subtraction Subtraction
A
0.05
0
-0.05
-0.1
-0.15
-60
-40
-20
0
o
χ( )
20
40
60
/ HBO )% >
& ? )% >
& ? !
14.6 / 5 χ 2 / ndf p0 -0.08689 ± 0.004593 p1 -7.277 ± 2.085
0.15
11.84 / 5 χ 2 / ndf p0 -0.08271 ± 0.004397 p1 -6.73 ± 1.977
0.1
No Subtraction Subtraction
A
0.05
0
-0.05
-0.1
-0.15
-60
-40
-20
0
o
χ( )
20
40
60
/ HFO )% > ? )% > ? 0 !
GE
C
Æ
)% )%
)% )%
SC 'B' SBD 'B' S'BD
'FBCC S
GE C 'BD 'B F BD 'BH H C 'F H 0 C SC
FB HC SBD FF B S'BD F CH S BEBEH 'BD FCEF BD FD'BC C FHFDH H'O
HB HF )% )% Æ
C
0
HBO 0 Æ
Æ
. .
&
G
1
Edep 12000
0.14
(a)
14000
(b)
(c) 0.12
10000
12000
0.1 10000
8000
0.08 8000 6000 0.06
6000 4000
0.04
4000
2000 0.02
2000
0
0
0
0.02 0.04 0.06 0.08
1
0.1
0.12 0.14
0
Edep
0 5
10
15
20
25
30
35
40
/
θn
0
5
10
15
20 / θn
25
30
35
40
/ HCO A >*#? > ?
) C B Q =
$ CD F 2
&
#
% D7
& > ? & GG
Edep(GeV)
180
0.14
200
(a)
160
(b)
(c)
0.12
1
140 150
120
0.1
100 0.08 100
80 0.06
60 40
50
0.04
20
0.02 0.04 0.06 0.08
0.1
0.12 0.14
0
5
10
15
20
25
30
(d)
400
10
15
20
25
30
35
40
o
θ /n( ) 0.14
500
(e)
(f)
0.12
1
300
300
5
θ/n( )
400
500
0 0
40
o
1
Edep(GeV)
600
35
Edep(GeV)
0
0.02
0
0
0.1
0.08 0.06
200
200
0.04 100
100
0.02 0
0 0
0.02 0.04 0.06 0.08
0.1
0.12 0.14
0
5
10
15
20
25
30
35
40
o
1
θ/n( )
Edep(GeV)
0 0
5
10
15
20
25
30
35
40
o
θ /n( )
/ HDO F > ? F >? 0 & > ? >? >? HC /
& D *# & & BD *#
!2) 2) / &
$ & & A
'
Edep(GeV)
350
0.14
(a)
350
(b)
300
300
250
250
200
200
150
(c)
0.12
1
400
0.1
0.08 0.06
150 100
0.04
100 50
50
0.02 0
0
0.02 0.04 0.06 0.08
0.1
0.12 0.14
0
5
10
15
20
25
30
35
0 0
40
5
10
15
20
25
30
o
1
35
40
o
θ/n( )
Edep(GeV)
θ /n( ) Edep(GeV)
0
0.14
(d)
1000
1000
(e)
(f)
0.12
1
1200
800
0.1
800 600
0.08
600
0.06 400
400
0.04 200
200 0 0
0.02
0.02 0.04 0.06 0.08
0.1
0.12 0.14
0 0
5
10
15
20
25
30
35
40
o
1
θ/n( )
Edep(GeV)
0 0
5
10
15
20
25
30
35
40
o
θ /n( )
/ HHO ! HD #
( / HD & > D'? B
> ? > 0? ( HDO>? E = ?
HFB &
> HCO> ??
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0.35 eff
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