Precision Experiments and Photon Spectroscopy at the Super FRS

• Motivation for the LEB• Energy and range focusing• Experimental opportunities:

– Agata– Laser Spectroscopy– Ion Traps

Magdalena GόrskaPolish-German Meeting, Warsaw, November 24, 2003

Motivation for the LEB(Low energy high-quality beams, complementary to ISOL)

• Neutron rich nuclei (H. Geissel)• Shells and shapes

(shell quenching) • N=Z nuclei (Z. Janas)• Symmetries (A. May)• Astrophysics (H.G., Z.J.)

T.R. Werner, J. Dobaczewski, W. Nazarewicz, Z. Phys. A358 (1997) 169

Opportunitiesat the LEB

H. Geissel et al., NIM A (1989)

Energy Buncher:

BMax = 10 Tmx = ±300 mm mrady = ±200 mm mradp/pacc = ± 2.5%

Ion optical R = 600

C. Scheidenberger

Z. J.

ε(Mγ=1,Eγ=1MeV) = 0.5

Collaboration: 42 countries including PL

I prod = 1 ion/s

GANIL: J.M. Daugas et al., Phys. Lett. B476 (2000) 213

Shell structure isomer

Warsaw Group

s(100Sn)=1.8 pb

FRS: Zs. Podolyak et al., Phys. Lett. B491 (2000) 225

Warsaw Group

Iprod = 0.2 ion/s

K - isomerism

Single-atom spectroscopy

Identification of the Doubly Magic 100Sn

(100Sn)=1.8 pb

S t o p p i n g P o w e r o f R e l a t i v i s t i c H e a v y I o n s

B r e a k - d o w n o f t h e r e l a t i v i s t i c B e t h e t h e o r y ,F R S e x p e r i m e n t a l r e s u l t s w e r e t h e m o t i v a t i o no f t h e n e w t h e o r e t i c a l d e v e l o p m e n t b y J . L i n d h a r da n d A . H . S o e r e n s e n

Pa ra ffine a nd c o nc re te shie ld ing

C o nc re te

x, y, E, TO F

x, y, E, TO F

Dum p

Dum p

LA SER sp e c tro sc o p y

So lid -sta te p hysic s,m e d ic ine , e tc . Tra p

syste m

Po we r sup p lie s

Po we r sup p lie s fo r b e a m -line m a g ne ts

Ro o ts b lo we r,g a s p urific a tio n,g a s re c yc ling

G a sc e ll

35 m e te r

- swift monoenergetic exotic beams (gamma-ray spectroscopy)

- ISOL type beams (laser spectroscopy, precision experiments)

- beam stopped in thin absorbers (α, β, γ spectroscopy) - see the next talk

Probing new fields at LEB with: