Trends in Heavy Ion Physics Research, Dubna, 21-25 May

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 groupM. Turrion

Trends in Heavy Ion Physics Research, Dubna, 21-25 May

Rex efficiencies

0.0

5.0

10.0

15.0

20.0

0 50 100 150 200 250

A

%

7Li238U

27Al

116Cd

Efficiencies for beams 2006Tot. eff. = Trap × BTS × EBIS × Sep

F. Wenander

So far: 53 radioactive isotopes of 20 elements – reaching 188Hg

Trends in Heavy Ion Physics Research, Dubna, 21-25 May

30,31,32Mg

67,69,71,73Cu, 68Cu, 70(m)Cu68Ni

74,76,78,80Zn28

50

20 40 50 82 184,186,188Hg82

70Se96Sr, 88Kr, 92Kr

20

The Coulex program

122,124Cd138,140Xe140,148,150Ba

106,108,110Sn

Trends in Heavy Ion Physics Research, Dubna, 21-25 May

Collective properties studied by Coulomb excitation

Miniball

107Ag

REX-ISOLDE

30,32Mg

E=2.86 MeV/u

PPACdetector

Beam

CD – detector

Double sided Si strip detector

Beam dump

Beam

impurities

E-E detector

• 24 - 6-fold segmented Ge detectors• flexible geometry• full 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• from induced charge in neighboring segments

• low-multiplicity -ray experiments with weak exotic beams

Trends in Heavy Ion Physics Research, Dubna, 21-25 May

68,mCu (2.83 MeV/u) @ 120Sn (2.3 mg/cm2)

70Cu (2.83 MeV/u) @ 120Sn (2.3 mg/cm2)

6-

(3-)

4-

(5-)

0 T1/2= 44.5 s

101 T1/2 = 33 s

228

506

127 (M1)

No Doppler Corr.

Doppler Corr. for A=70

85 T1/2 = 7.84 ns1+

(2+)

6-

4-

(3-)722 T1/2 = 3.75 min

(5-)

0 T1/2 = 31.1 s

956178 (M1)

693

84

778 0.7 < T1/2 < 4 nsE2

E2

Post-accelerated isomeric beamsCoulomb excitation of 68,70Cu

242 T1/2 = 6.6 s 1+

I Stefanescu et al, PRL 98 (2007) 122701

Trends in Heavy Ion Physics Research, Dubna, 21-25 May

Combination of spectroscopy, laser ionization and mass measurements

270

300

330

360

390

Mea

n T

OF

/

s

270

300

330

360

390

Mea

n T

OF

/

s

0 2 4 6 8 10 12

270

300

330

360

390

Mea

n T

OF

/

s

c - 1300610 / Hz

16%

4%

80%

Intensity ratio:

normalized to the area

with cleaning of 6– state

Unambiguous state assignment!c = B

qm

(6–) state = gs

(3–) state = 1.is

1+ state = 2.is

R 1·10-7

ME of ground state is 240 keV higher than literature value!

Excellent agreement with decay studies.

101(3) keV101(3) keV

242(3) keV242(3) keV

Trends in Heavy Ion Physics Research, Dubna, 21-25 May

Shape coexistence in the Pb region182Pb: T1/2 55 ms 1 count/min

186PbA.Andreyev et al. Nature, 405, 430 (2000)

Nilsson-StrutinskyNilsson-Strutinsky

Resonant Laser IonizationH. De Witte et al. PRL 98, 112502 (2007)

ISOLDE; more than 30 years ago

Trends in Heavy Ion Physics Research, Dubna, 21-25 May

More evidence

Resonant Laser Ionization of Po isotopesT. Cociolis et al., preliminary results

Coulomb excitation of 184,186,188Hg isotopesN. 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. Mach et al.

Trends in Heavy Ion Physics Research, Dubna, 21-25 May

Aims of the upgrade

IntensityEnergy

Coulex for all RIB Transfer reactions

Efficiency low energy + acceleratedSelectivityBeam “quality”

Reduced phase space Bunching

Polarization ..... > 100 keV/u

+ + +++

magnet

tilted foils

HF

+ + +++

magnet

tilted foils

+ + +++

magnet

tilted foils

HF

Trends in Heavy Ion Physics Research, Dubna, 21-25 May

HIE-ISOLDE at CERNIncrease in REX energy from 3 to 5.5 MeV/u (later increase to 10 MeV/u possible)

Super-HRS for isobaric separationRILIS upgrade & LIST

RFQ cooler, REX-TRAP, REX-EBIS REX-ECR upgrades

Increase proton intensity 2 6 A (LINAC4, PSB upgrade) - target and front-end upgrade

Trends in Heavy Ion Physics Research, Dubna, 21-25 May

... already ongoing

RFQ coolerUK, JYFL, Mainz..

RILIS upgradeSweden (Wallenberg)

REX extensionUK (Cockcroft Institute..), Leuven..

+ in CERN white paper “4. theme”

Trends in Heavy Ion Physics Research, Dubna, 21-25 May

Bunched-beam laser spectroscopy: Bunched-beam laser spectroscopy: 4444KK

E. Mane

Trends in Heavy Ion Physics Research, Dubna, 21-25 May

SC linac

M. Pasini

Max energy for different A/q :

Trends in Heavy Ion Physics Research, Dubna, 21-25 May

Some extrapolated yields

Trends in Heavy Ion Physics Research, Dubna, 21-25 May

European Roadmap for RIB facilities

Jan 07 agreement – Complimentarity;Collaboration

EU EURISOL Design Study

ESFRI list

107 €

108 €

109 €

EU FAIR Design Study

SPL (CERN)decision

P. Butler

Trends in Heavy Ion Physics Research, Dubna, 21-25 May

Beta-Beams

2 x 1013 ions/s6He and 18Ne

Trends in Heavy Ion Physics Research, Dubna, 21-25 May

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-2006-013HIE-ISOLDE: the scientific opportunities - CERN-2007-008