RADIOACTIVE BEAMS AT SPL

RADIOACTIVE BEAMS AT SPLOPPORTUNITY FOR NEW PHYSICS !

Juha Aysto , CERN

Physics opportunitiesNuclear physics

Astrophysics

Fundamental symmetries

Material science

Medical applications

Technology of RIBs

Mg334847051243221 4847591243 705

1221

Na8.0 (3) ms (3/2 )33

Q = 20.3(15) MeV

( 3/2 )+(+)

P(2n )= 13 (3) %

Sn = 2071Mg + n32

Mg + 2nS2n = 7722 171221 5088514

3619732152 2551

8852321285830372551

221502nn

159546 ( 5/2 )+( 3/2 )-( 7/2 )-

+

P(1n )= 47(6) %

g.s. = 20 (11) %

31

64 66 68 70 72 74 76 78 8010-510-410-310-210-1100101102103104105106107108109

1010

Ni

Copper

ISOLDE GSI-ISOL LISOL IGISOL GSI-FRSB

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Inte

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Mass

http://www.cern.ch/ISOLDE

ISOLDE/CERN

ISOLDE Physics Program 2000

Weak Interaction and Nuclear Physics

46%

Solid state physics23%

Particle and Astrophysics

11%

Biology/Medicine3%

Atomic Physics17%

39 Experiments270 Users77 Institutes22 Countries

R E X - I S O L D E : R a d i o a c t i v e b e a m E X p e r i m e n t a t I S O L D E

d e m o n s t r a t i o n o f a n o v e l c o s t - e f f e c t i v e a n d e f f i c i e n t p o s t - a c c e l e r a t i o n s c h e m e R I B w i t h 0 . 8 - 2 . 2 M e V A f o r n u c l e a r p h y s i c s a n d a s t r o p h y s i c s : C o u l o m b e x c i t a t i o n a n d t r a n s f e r

r e a c t i o n e x p e r i m e n t s ( N = 2 0 , N = 2 8 ) , h a l o s t r u c t u r e , u n b o u n d n u c l e i , … l o w e r e n e r g y ( < 6 0 k V Q ) s i n g l y a n d m u l t i p l y c h a r g e d p u l s e d i o n b e a m s f o r a t o m i c p h y s i c s ,

w e a k i n t e r a c t i o n s t u d i e s , s o l i d s t a t e p h y s i c s , … .

a c c u m u l a t i o n , c o o l i n g & b u n c h i n g c h a r g e s t a t e b r e e d i n g p o s t - a c c e l e r a t i o n

H V p l a t f o r m s

I S O L D E6 0 k e V

m / q = 4 - 5

R F Q I H7 - g a pr e s o n a t o r s

2 M e V / u

t o t a r g e t &d e t e c t o r a r r a y

E B I S

t o o t h e r e x p e r i m e n t s

P E N N I N GT R A P

P r i n c i p l e :

Second generation RNB facility at CERN

J. Aysto, Mats Lindroos, H.Ravn, Piet van Duppen and the ISOLDE

team

CERN-PS-2000-075 (OP)CERN-EP-2000-149

Protons for 2nd generation Isolde can be extracted from linac at various energies

Second Generation RNB Facility

• A second generation Radioactive Nuclear Beam (RNB) facility at CERN using the SPL as the proton driver– Post acceleration to 10-100 MeV/u (linac / cyclotron)

– Intensity increase x 100 - 1000

– Large-acceptance spectrometer

– Large multi-segmented detectors

– Re-cycler / storage ring

– Antiproton-RNB physics to be explored

– Muon-RNB physics to be explored

SPL - RNB facility at CERN

Hall 1 Hall 2

Hall 3

AD

ISOLDE storage ring

Muons in physics of exotic nuclei

Radioactive muonic atoms (with slow muons)--> high-precision data on nuclear charge radii &

moments novel structure features far from stability

parity nonconservation in Fr, Ra atoms

--> high probability for nuclear capture (semileptonic)production of neutron-rich nuclei ?collective excitation modes in neutron-rich nucleirenormalization of gA in nuclear medium

--> atomic cross sections !!!

Nuclear astrophysics--> supernova models, neutrinos and r-process

Deep inelastic scattering and capture (fast muons) ?--> quark and hadron dynamics

Technical feasibility of capture

• “japanese” recipe: solid H film + transfer

• combined cyclotron and ion traps

• merging beams

• other ??

LaserRFcharged particlesatoms

lightreactions and decay products

Combined cyclotron and ion traps

Cyclotron trap at PSI105 -/s @ 20…50 keVscale by 106 --> N = 1011 /s

v = 1.5 - 30 cm/

Ion traps at ISOLDE Nion = 106 /cm3

Natoms= N Nion capt v= 6…120 /s

Intersecting storage ring

• Energy range– ions: 5-150 MeV/u

– muons:

– antiprotons:

• Electron cooling on both rings

• Multi turn injection

• Magnet rigidity difference: B1/B2<10

Mats Lindroos et al.

Luminosity muons zeroth order - no cooling

• Luminosity:– 107 ions, 1012 muons per second as in PRISM

– Fraction of muons within useful range: 10-4

• dp/p = 5 10-4

• Emittance = 1 micrometer

• Relative energy difference in c.m. = 50 eV

– <1013 cm-2s-1 (10-11 barn-1s-1)

• Problem– Muon cooling and intensity

Phase 1

• Anti protonic exotic ions– ISOLDE, REX-2, AD and the

Intersecting storage ring

• Multi-turn injection with stacking using electron cooling

• Energy range:– Antiprotons: 100 MeV/c– Exotic ions: 5.27 MeV/u (Lorenz beta: 0.106)

Phase 2

• Muonic exotic ions:– ISOLDE– Post accelerator 100 MeV/u– Neutrino factory TARGET– Intersecting storage ring

• Energy range:– Muons: 15 MeV– Ions: 137 MeV/u (beta=0.48)

RAMA Workshop @ CERN February 2001

• Idea

– Intense RNB Facility ( at SPL ? )

– Intense muon source (-factory ?)

– Intense antiproton source (AD+)

• For

– nuclear structure of exotic nuclei

– Fundamental symmetries

– Special cases (charge radii)

– Surprises

Physics case studies: RAMA Workhsop at ECT* Trento in May

• Nuclear structure aspects

• Astrophysics perspectives

• Semileptonic processes in nuclei

• Atomic phenomena

• Techniques and detectors

• Key experiments ?

Acknowledgements

• Alain Blondel, Klaus Jungmann, F. Kottman, L. Simons

• Mats Lindroos, Roland Garoby, + PS-team

• Helge Ravn, Thomas Nilsson

• Karl Langanke, Karsten Riisager, Jules Deutsch, Witek Nazarewicz

• many other experts in the field