Transcript Present and future physics possibilities at ISOLDE

Present and future physics
possibilities at ISOLDE
Karsten Riisager
PH Department, CERN
http://www.cern.ch/isolde
Trends in Heavy Ion Physics Research, Dubna, 21-25 May
ISOLDE@CERN
Trends in Heavy Ion Physics Research, Dubna, 21-25 May
RIBs for 40 years
• High-energy proton beam
– 600 MeV → 1.4 GeV
• Accumulated experience in RIB-production
and -manipulation
– targets and ion sources
– charge breeding
– cooling, bunching, ...
• Many experimental tools
Trends in Heavy Ion Physics Research, Dubna, 21-25 May
ISOLDE yields, 2006
ISOLDE target group
Trends in Heavy Ion Physics Research, Dubna, 21-25 MayM. Turrion
Rex efficiencies
Efficiencies for beams 2006
Tot. eff. = Trap × BTS × EBIS × Sep
20.0
27Al
%
15.0
116Cd
10.0
7Li
238U
5.0
0.0
0
50
100
150
200
250
A
So far: 53 radioactive isotopes of 20 elements – reaching 188Hg
F. Wenander
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The Coulex program
20
40 50
82
184,186,188Hg
82
106,108,110Sn
50
122,124Cd
70Se
138,140Xe
96Sr, 88Kr, 92Kr
28
140,148,150Ba
74,76,78,80Zn
67,69,71,73Cu, 68Cu, 70(m)Cu
30,31,32Mg
68Ni
20
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Collective properties studied by
Coulomb excitation
CD – detector
DE-E detector
Double sided Si
strip detector
Miniball
PPAC
REXISOLDE
30,32Mg
E=2.86 MeV/u
107Ag
Beam
• 24 - 6-fold segmented Ge detectors
• flexible geometry
• efull energy(@ 1.33 MeV)  7 %
• fully digital electronics + pulse shape analysis
(PSA)
• electronic segmentation and PSA: 50-100 fold
increase in granularity
• r from central core
• f from induced charge in neighboring
segments
• low-multiplicity g-ray experiments with weak
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exotic beams
Beam dump
detector
Beam
impurities
Post-accelerated isomeric beams
Coulomb excitation of 68,70Cu
 68,mCu (2.83 MeV/u) @ 120Sn (2.3 mg/cm2)
No Doppler Corr.
(5-)
4E2
(3-)
178 (M1)
6-
956
778 0.7 < T1/2 < 4 ns
722 T1/2 = 3.75 min
693
 70Cu (2.83 MeV/u) @ 120Sn (2.3 mg/cm2)
(2+)
1+
(5-)
84
85
0
T1/2 = 7.84 ns
T1/2 = 31.1 s
506
Doppler Corr. for A=70
1+
4E2
(3 )
6-
242 T1/2 = 6.6 s
228
127 (M1)
101 T1/2 = 33 s
0 T1/2= 44.5 s
Trends in Heavy Ion Physics Research, Dubna, 21-25 May
I Stefanescu
et al, PRL 98 (2007) 122701
Combination of b-g spectroscopy, laser ionization
and mass measurements



390
16%
80%
4%
Mean TOF / s
Intensity ratio:

360
330
300
 (6–) state = gs
270
390
Unambiguous state
assignment!
Mean TOF / s
normalized to the area

360
330
300
101(3) keV
 (3–) state = 1.is
270
ME of ground state is 240 keV
higher than literature value!
Excellent agreement with decay
studies.
R
Mean TOF / s
390

360
330
242(3) keV
with cleaning of 6– state
300
 1+ state = 2.is
270
1·10-7
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0 Dubna,
2
4 May
6
8
 - 1300610 / Hz
10
12
Shape coexistence in the Pb region
182Pb:
T1/2 55 ms 1 count/min
A.Andreyev et al. Nature, 405, 430 (2000)
186Pb
ISOLDE; more than 30 years ago
Nilsson-Strutinsky
Resonant Laser Ionization
H. De Witte et al. PRL 98, 112502 (2007)
Trends in Heavy Ion Physics Research, Dubna, 21-25 May
More evidence
Resonant Laser Ionization of Po isotopes
T. Cociolis et al., preliminary results
Coulomb excitation of 184,186,188Hg isotopes
N. Bree, A.Petts et al., preliminary results
Trends in Heavy Ion Physics Research, Dubna, 21-25 May
An example: 30-33Mg
• 2nd 0+ in 30Mg at 1788 keV, weak mixing –
Schwerdtfeger at Dec 07 ISOLDE workshop
• Coulex of (30,32Mg and) 31Mg – Reiter do
• Transfer d(30Mg,31Mg)p – Bildstein do
• Magnetic moments 31,33Mg, COLLAPS –
Yordanov et al, PRL 99 (2007) 212501
• Masses, MISTRAL – Lunney et al, Eur. Phys. J. A28
(2006) 129
• Level lifetimes – Mach et al, Eur. Phys. J. A25 (2005) 105
• Radii, beta-decay studies,...
Trends in Heavy Ion Physics Research, Dubna, 21-25 May
Decay studies @ ISOLDE
previous IS414 results:
H.Heavy
Mach
al. Research, Dubna, 21-25 May
Trends in
Ionet
Physics
Aims of the upgrade
Intensity
Energy
 Coulex for all RIB
 Transfer reactions
Efficiency
low energy + accelerated
Selectivity
Beam “quality”
 Reduced phase space
 Bunching
+
Polarization .....
+
tilted foils
b
+
+
+
> 100 keV/u
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HF
magnet
HIE-ISOLDE at CERN
Increase in REX energy from 3 to 5.5 MeV/u
(later increase to 10 MeV/u possible)
Increase proton intensity 2  6 A (LINAC4,
PSB upgrade) - target and front-end upgrade
RFQ cooler, REX-TRAP, REX-EBIS
REX-ECR upgrades
Super-HRS for isobaric separation
RILIS upgrade & LIST
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... already ongoing
RFQ cooler
UK, JYFL, Mainz..
RILIS upgrade
Sweden (Wallenberg)
REX extension
UK (Cockcroft Institute..), Leuven..
+ in CERN white paper “4. theme”
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Bunched-beam laser spectroscopy: 44K
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E. Mane
SC linac
Max energy for
different A/q :
M. Pasini
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Some extrapolated yields
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European Roadmap for RIB facilities
EU EURISOL Design Study
107 €
Jan 07 agreement –
Complimentarity;
Collaboration
SPL (CERN)
decision
108 €
ESFRI list
EU FAIR Design Study
109 €
P. Butler
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Beta-Beams
2 x 1013 ions/s
6He and 18Ne
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Thanks to:
The ISOLDE Physics Group
The ISOLDE Technical Group
The ISOLDE Collaboration
Peter Butler
Mats Lindroos
Mark Huyse
http://hie-isolde.web.cern.ch/HIE-ISOLDE/
HIE-ISOLDE: the technical options - CERN-2006-013
HIE-ISOLDE: the scientific opportunities - CERN-2007-008
Trends in Heavy Ion Physics Research, Dubna, 21-25 May