trends in heavy ion physics research, dubna, 21-25 may present and future physics possibilities at...

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

Present and future physics possibilities at ISOLDE

Karsten RiisagerPH Department, CERN

http://www.cern.ch/isolde




ISOLDE@CERN


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

http://indico.cern.ch/contributionDisplay.py?contribId=45&sessionId=0&confId=20250


ISOLDE yields, 2006

ISOLDE target groupM. Turrion


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


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


Collective properties studied by Coulomb excitation

Miniball

107Ag

REX-ISOLDE

30,32MgE=2.86 MeV/u

PPACdetector

Beam

CD – detectorDouble sided Si strip detector

Beam dump

Beamimpuritie

s

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


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 s101 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


Combination of spectroscopy, laser ionization and mass measurements

270

300

330

360

390

Mea

n TO

F /

s

270

300

330

360

390

Mea

n TO

F /

s

0 2 4 6 8 10 12

270

300

330

360

390

Mea

n TO

F /

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.isR 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


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


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


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,...





Decay studies @ ISOLDE

previous IS414 results: H. Mach et al.


Aims of the upgradeIntensityEnergy

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


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


... already ongoing

RFQ coolerUK, JYFL, Mainz..

RILIS upgradeSweden (Wallenberg)

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

+ in CERN white paper “4. theme”


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

E. Mane


SC linac

M. Pasini

Max energy for different A/q :


Some extrapolated yields


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


Beta-Beams

2 x 1013 ions/s6He and 18Ne


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

http://hie-isolde.web.cern.ch/HIE-ISOLDE/

trends in heavy ion physics research, dubna, 21-25 may present and future physics possibilities at...

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