ZeroDegree

1
Layout of RIKEN RI beam factory (RIBF) in 2007
ZeroDegree
RRC
RILAC
RIPS
ZeroDegree
RARF
(old)
BigRIPS
fRC
IRC
SRC
2
Performance of RIBF
345 MeV/nucleon
pU 345 MeV/u 1 pmA (6x1012 /sec) (goal)
Projectile fragmentation In-flight fission of U
3
g-ray spectroscopy at RIBF

• 2008/1/23-25
• Joint JUSTIPEN-LACM Meeting 
• _at_Oak Ridge
• AOI Nori, RIKEN

the world heaviest cyclotron SRC
1998-2006
RIKEN RIBF, BigRIPS, ZeroDegree g
-spectroscopy at RIBF Beam Intensity
4
g-ray spectroscopy at RIBF

• 2008/1/23-25
• Joint JUSTIPEN-LACM Meeting 
• _at_Oak Ridge
• AOI Nori, RIKEN

• RIKEN RIBF, BigRIPS, ZeroDegree
• g -ray spectroscopy at RIBF
• Expected Primary and Secondary
• Beam Intensity

5
Configuration of the RIBF accelerator complex
Several modes in the cascade operation
Goal performance of RIBF cyclotrons
- Energy 345 MeV/u up to U ions
400 MeV/u for light A ions - Intensity 1 pµA
up to U ions (6x1012 par./sec) - Max. beam
power 83.3 kW (238U at 350MeV/u)
-gt Production reaction in-flight fission of U
beams as well as projectile fragmentation
6
Standard beam-line detectors at
BigRIPS/ZeroDegree focuses
Si (?E) _at_F7, F2, F3
NaI (E) _at_F7
DL-PPAC (position)
Plastic scinti. (TOF)
Ge _at_F7 for isomer ?-decay measurement (Isomer PID)
Intensity monitor (primary beams) _at_F0
MUSIC (?E) _at_F7, (F2, F3)
To be ready soon
Si
FCT
Plastic
7
June 2007
Identification from B?, TOF, ?E, E with an
empirical matrix for optics
d(A/Q) 0.05 (AZr, at 1s)
3.61012 238U86 beam (4x107 s-1, -1day)
- 10-5 of the goal
122Pd
123Pd
Z
124Pd
122Pd45
120Pd45
119Pd45
121Pd45
125Pd (27 counts)
123Pd45
A/Q
126Pd (3 counts)
A/Q
8
Recent Achievements and Commissioning Runs at
BigRIPS

• Dec. 28th, 2006 First beam from SRC
• 27Al10 at 345 MeV/u
• Mar. 13th, 2007 First RI-beam production at
  BigRIPS
• using 345A MeV 86Kr beam
• Mar. 24th First 238U beam 345 MeV/u
• Mar. 27th First RI-beam using U in-flight
  fission at RIBF
• May 16-Jun. 3 238U 0.03 pnA max
• New Isotope Search
• Optics / Detector performance, etc
• Jun. 29-Jul. 2 238U
• Detector tests (IC, NaI), etc
• Yield survey for 80Zn, 130Cd, etc

9
BigRIPS and ZeroDegree spectrometer
BigRIPS
ZeroDegree
1st stage Separation
2nd stage Tagging/Further separation
Production Target
F12
F8
F7
F2
F1
F3
F5
SRC
F11
IRC
Dq /- 40mr(h) 50mr(v) Dp /- 3
Large Acceptance ? Projectile
fragmentation Projectile fission
10
BigRIPS and ZeroDegree spectrometer
BigRIPS
1st stage Separation
2nd stage Tagging/Further separation
F12
Production Target
F8
F7
F2
F1
F3
F5
SRC
F11
IRC
Dq /- 40mr(h) 50mr(v) Dp /- 3
Large Acceptance ? Projectile
fragmentation Projectile fission
11
BigRIPS and ZeroDegree spectrometer
BigRIPS
1st stage Separation
2nd stage Tagging/Further separation
Production Target
F12
F8
F7
F2
F1
F3
F5
SRC
F11
IRC
Dq /- 40mr(h) 50mr(v) Dp /- 3
Large Acceptance ? Projectile
fragmentation Projectile fission
12
BigRIPS and ZeroDegree spectrometer
BigRIPS
Reaction Residue Tagging With ZeroDegree
1st stage Separation
2nd stage Tagging/Further separation
Target
g
F12
Production Target
F8
F7
F2
F1
F3
F5
SRC
F11
IRC
Dq /- 40mr(h) 50mr(v) Dp /- 3
Large Acceptance ? Projectile
fragmentation Projectile fission
13
g spectroscopy with ZeroDegree

• High resolution
• Large maximum Br

g
PID ZDS
14
ZeroDegree Spectrometer
15
ZeroDegree Spectrometer
3m
?
F8 Target position
16
ZeroDegree Spectrometer
17
Target position of ZeroDegree/BigTOFspe(tentative
name)
3010 mm
1950 mm
18
Target position of ZeroDegree/BigTOFspe(tentative
name)
3010 mm
1950 mm
Target g-detectors
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DALI2

• 160 NaI(Tl) detectors
• Each detector
• 4.5 x 8 x 16 (cm3)
• ?E/E 9 _at_ 662keV
• Array
• 16 layers
• 614 detectors in each layer

20
?-detector array

• DALI
• 160 NaI(Tl) detectors
• Efficiency 17 (FWHM)
• E resolution 150keV
• (_at_ 1MeV, ß0.3)

GRAPE --- 18 Ge detectors S. Shimoura, E.
Ideguchi(CNS) Efficiency 5 Pos.
resolution 2mm E resolution 10keV
(_at_2.1MeV, ß 0.3)
21
?-detector array

• DALI
• 160 NaI(Tl) detectors
• Efficiency 18 (FWHM)
• E resolution 100keV
• (_at_ 2.1MeV, ß0.6)

GRAPE --- 18 Ge detectors S. Shimoura, E.
Ideguchi(CNS) Efficiency 3 Pos.
resolution 2mm E resolution 40keV
(_at_1MeV, ß 0.6)
22
DALI vs GRAPE
23
DALI2 (Detector Array for Low Intensity radiation
2)

• 160 NaI(Tl) detectors
• Each detector
• 4.5 x 8 x 16 (cm3)
• ?E/E 9 _at_ 662keV
• Array
• 16 layers
• 614 detectors in each layer

24
CNS GRAPE (Gamma-Ray detector Array with Energy
and Position sensitivity)
CNS, Univ. Tokyo --- S. Shimoura, E. Ideguchi et
al. Efficiency 5 (4 achieved) Pos.
resolution 2mm (5mm achieved) E resolution
10keV (16keV _at_ 2.1MeV, ß 0.3 achieved)
25
BigRIPS and ZeroDegree spectrometer
BigRIPS
SHARAQ
1st stage Separation
2nd stage Tagging/Further separation
F12
Production Target
F8
F7
F2
F1
F3
F5
SRC
F11
IRC
Dq /- 40mr(h) 50mr(v) Dp /- 3
Large Acceptance ? Projectile
fragmentation Projectile fission
26
g spectroscopy with SHARAQ

• Very high resolution
• (Relatively small p acceptance)

SHARAQ is being developed by ICHOR project,
Univ. of Tokyo
g
PID, mom. Analysis SHARAQ
27
g spectroscopy with BigTOF (Tentative name)

• Sufficient PID resolution for A100
• High particle species acceptance (good for
  cocktail beam)

g
PID BigTOF
DA/A 1
28
Layout of RIKEN RI beam factory (RIBF) in 2007
ZeroDegree
RRC
RILAC
RIPS
ZeroDegree
RARF
(old)
BigRIPS
fRC
IRC
SRC
29
RI spin lab.
Phase 2
H. Ueno et al
Spin polarized RI beam IRC-based
production nuclear moment condensed matter
physics
IRC
use of RIPS with IRC beam
Beam line
Pol. RI beam
RIPS
target
30

• Performance of
• Primary and
• Secondary Beams

31
Performance of RIBF
345 MeV/nucleon
pU 345 MeV/u 1 pmA (goal)
32
Performance of RIBF
345 MeV/nucleon
pU 345 MeV/u 1 pmA (6x1012 /sec) (goal)
Projectile fragmentation In-flight fission of U
33
Beam Intensity
86Kr34
30 pnA
345 MeV/u
Achieved
238U86
0.04 pnA
345 MeV/u
Achieved
34
June 2007
3.61012 238U86 beam (4x107 s-1, -1day)
- 10-5 of the goal
d(A/Q) 0.05 (AZr, at 1s)
Z
Pd
A/Q
35
June 2007
Identification from B?, TOF, ?E, E with an
empirical matrix for optics
d(A/Q) 0.05 (AZr, at 1s)
3.61012 238U86 beam (4x107 s-1, -1day)
- 10-5 of the goal
122Pd
123Pd
Z
124Pd
122Pd45
120Pd45
119Pd45
121Pd45
125Pd (27 counts)
123Pd45
A/Q
126Pd (3 counts)
A/Q
36
Beam Intensity (near future)
86Kr34
30 pnA
345 MeV/u
Achieved
100 pnA
feasible in coming year
238U86
0.04 pnA
Achieved
345 MeV/u
10 pnA
feasible in coming year
37
Beam Intensity (near future)
86Kr34
30 pnA
345 MeV/u
Achieved
100 pnA
feasible in coming year
238U86
0.04 pnA
Achieved
345 MeV/u
10 pnA
feasible in coming year
1 pµA
need more investigation, investment
38
present accelerator performance
86Kr34
1.1 eµA (30 pnA)
345 MeV/u
Nov. 10th
238U86
5 enA (0.04 pnA)
345 MeV/u
Jun. 29th
etrans
lt3 (50)5
estripper (RRC-SRC)
lt5 (15 30)
IRRC
15 pnA
Tuning of Accelerators, BT Flat-Top operation
Stripper, New Injector, New IS
10 pnA U
feasible in coming year
1 pµA U
x100
need more investigation, investment
39
Injector system dedicated for RIBF
U35
Independent operations of RILAC-GARIS (SHE,
..) and RIBF
new injector
U71
U86
40
Estimation of RI-beam intensities _at_BigRIPS
Courtesy of T. Suda
Expected RI-beam intensities 78Ni 10 pps
(238U) 132Sn 107 pps (238U) 100Sn 1
pps (124Xe) I(primary beam) 1 pµ?.
5
4
1 86KrBe 2 136XeBe 4 UPb fission 5 UBe
Frag 6 UBe fission
2
6
Estimation based on the GSI data and the ABLABRA
and EPAX2 formula
1
41
Estimated beam intensity at BigRIPS
86Kr/136Xe/238U 1pµA
86Kr/136Xe/238U 1pµA
r-process
Nov07
Spiral2

• Calculation uses
• 86Kr Be Fragmentation EPAX2
• 136Xe Be Fragmentation EPAX2
• 238U Be Fragmentation EPAX2
• Fission DATA_at_GSI (limited)
• 238U Pb Fragmentation EPAX2
• Fission ABLABRA

42
Estimated beam intensity at BigRIPS
Expected RI-beam intensities 78Ni 10 pps
(238U) 132Sn 107 pps (238U) 100Sn 1
pps (124Xe) I(primary beam) 1 pµ?.
86Kr/136Xe/238U 1pµA
86Kr/136Xe/238U 1pµA
1
r-process
Nov07
Spiral2

• Calculation uses
• 86Kr Be Fragmentation EPAX2
• 136Xe Be Fragmentation EPAX2
• 238U Be Fragmentation EPAX2
• Fission DATA_at_GSI (limited)
• 238U Pb Fragmentation EPAX2
• Fission ABLABRA

43
(goal)
78Ni
at present T1/2 up to 78Ni E(2)
up to 76Ni B(E2) up to 70Ni
44
(goal)
1cps/10pnA
78Ni
at present T1/2 up to 78Ni E(2)
up to 76Ni B(E2) up to 70Ni
45
(goal)
B(E2)
Ex(2)
76Ni
1cps/10pnA
78Ni
at present T1/2 up to 78Ni E(2)
up to 76Ni B(E2) up to 70Ni
46
B(E2)
Ex(2)
132Sn
130Cd
129Ag
1cps/10pnA
47
109Zr
1cps/10pnA
48
Ex(2),B(E2)
109Zr
1cps/10pnA
49
Use of RIPS

• LINIAC RRC
• 86Kr 80pnA_at_63AMeV
• 70Zn 150pnA_at_63AMeV
• Lower energy
• Higher intensity
• No magnetic spectrometer for reaction residue

50
Layout of RIKEN RI beam factory (RIBF) in 2007
ZeroDegree
RRC
RILAC
RIPS
ZeroDegree
RARF
(old)
BigRIPS
fRC
IRC
SRC
51
Layout of RIKEN RI beam factory (RIBF) in 2007
ZeroDegree
RRC
RILAC
RIPS
ZeroDegree
RARF
(old)
BigRIPS
fRC
IRC
SRC
52
Use of RIPS

• LINIAC RRC
• 86Kr 80pnA_at_63AMeV
• 70Zn 150pnA_at_63AMeV
• LINAC RRC (fRC) IRC
• ltPb 100pnA_at_115AMeV
• 1pµA_at_115AMeV (goal)
• Lower energy
• Higher intensity
• No magnetic spectrometer for reaction residue

53
Phase-II construction 2007-2010
To maximize the potentials of intense RI beams
available at RIBF
http//rarfaxp.riken.go.jp/RIBF-TAC05/
SCRIT - e-RI collision Wakasugi, Suda et al.
SAMURAI - large acceptance Kobayashi et al.
Rare RI Ring mass Ozawa et al.
SHARAQ - high resolution Shimoura et al.
SLOWRI- slow beams Wada et al.
RI Spin Lab. at RIPS pol. RI beam Ueno et al.
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Expected beam list in 2007-2008
2 pnA 1.2 x 1010 particles/sec
http//ribfwww.riken.go.jp/exp/pre/accelerator/con
cept.html
? The construction project of a new injector
linac with a new superconducting 28-GHz ECR ion
source is beginning, aiming at upgrading the
intensity.
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First observation of in-flight fission at BigRIPS
238U Be _at_ 345AMeV
PID using tagging section
Z50
Z40
Z39
2007/3/27 T.Kubo, T. Ohnishi, and BigRIPS
Commissioning team
58
BigRIPS first-stage
Courtesy of S. Bishop (left) A. Saito (right),
Oct. 2, 2006
59
BigRIPS second-stage
60
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Zero-degree spectrometer
H. Sakurai et al
particle ID / momentum analysis e.g. Doppler
shifted ?-ray measurements with identification
of products (angle-integrated cross section)
p/dp 2000 4000 pacc 3
131Sn
132Sn
133Sn
GRAPE (Ge)
DALI2 (NaI)
132Sn
Ejectile PID
?-detector
Commissioning in early 2008FY
From BigRIPS
65
SHARAQ
S. Shimoura et al
High-resolution spectrometer with
dispersion-matched beam line RI beam as
probes e.g. double charge exchange
swing
B? 6.8 Tm p/dp 15000 (1mm obj) O4.6 msr,
dp1
beam line (dispersion matching)
SRC
SHARAQ (CNS)
66
SHARAQ construction
Magnets installed in 2007 Dispersive BT in
2008 Commissioning in 2008?
sc-QQ
dispersive BT line
sc-QQ
67
at present T1/2 up to 78Ni E(2)
up to 76Ni B(E2) up to 70Ni ?2(pp)
for 74Ni
68
(EPAX2)
(EPAX2)
(ABLABRA)
(GSI data)
78Ni
69
78Ni
70
54Ca
56Ca
71
64Cr
62Ti
?
72
126Pd
?
73
202Os
200W
198Hf
74
132Sn
134Sn
136Sn
138Sn
?