FRS Stopped ‘Campaign’
• Physics Aims?
– Physics aims are study of nuclear structure properties of
exotic nuclei using g, b, a and proton decay.
• Time Scale ?
• Starting late summer 2005,
• 1 to 2 months of beam time (4 to 8 experiments)
• Reasoning Behind Campaign ?
– Efficiency
• calibration of FRS, data acquisition, electronics setup, most efficient detector set-up.
– Window of Opportunity
• Detectors available (RISING!!)
• Do physics nowhere else can!
Heaviest odd-odd,N=Z gammas, isobaric analog states ?
86Tc, C. Chandler et al. Phys. Rev. C61 (2000) 044309
J. Garces Narro et al. Phys Rev. C63 (2001) 044307
All
Implant
fragments
into Si strip
detector…if
N=Z, stop
beam for
1second and
wait…..
T=1
ground
states in
heavy
odd-odd
N=Z
BIL gated
Gamma-gamma analysis on 200Pt
isomer (21 ns!), Caamano et al.
Nucl. Phys. A682 (2001) p223c;
Acta Phys. Pol. B32 (2001) p763
 J ( J  1) 
2J 1
 2  2 / 3 A3 Ap  A
2


Pj 
exp 
,  f  0.01781  b  Ap
2
2


2 fj
2 f 
Ap  1
 3 

 J ( J  1) 

sharp cut - off model predicts isomer ratio, Rth   Pj dJ  exp  
2


Jm
2

f


M. de Jong et al.
Nucl. Phys. A613
(1997) p435

M. Pfutzner et al. PRC65
(2002) 063604
K. Gladnishki, Z.
Podolyak et al,. PRC69
(2004) 024617
Possible Physics Aims
• Isomer Experiments
– Shape coexistence in
neutron deficient Z>82
– Single particle states
around 132Sn ?
– Seniority isomers
around 78Ni ?
– K-isomers in 180 and
N=74 ?
– Neutron rich, Z~82
spectroscopy ?
• Other (related) work
– G-factor measurements
– fast timing using BaF2
• DSSD work ?
– Beta-delayed gammaray spectroscopy
– Proton emitters
– alpha fine structure
Experimental Equipment
• Detectors
– RISING CLUSTERs
– BaF2 for fast timing
– active stopper(s)?
• Si only ?
• CdZnTe ?
• Active degraders ?
• Flash problem ?
– Dedicated electronics
– TDR ?
– Free running clock ?
Holdovers from the Isomer Campaign
(EA June 29 2000!)
Experiments related to fast campaign
•132Te Coulex (Schlegel/Gerl 18 shifts)
•32Mg Coulex via 2-step fragmentation (Gerl 21 shifts)
Stopped Experiments from Campaign still to run.
•Effective charges around 56Ni (Rudolph, 12 shifts)
•Isomer spec. around 78Ni with fission frags. (Grawe 21 shifts)
•Isomer spec. of odd-odd Tz=0 82Nb and 86Tc (Regan 15 shifts)
Experiments which have already run
•Shell structure around 132Sn (Mineva et al., 12 shifts)
•Isomer spect. and shape coex. of Pb isotopes (Page 15shifts)
•Shape coex. in Neutron-Rich Po,Th Nuclei (Podolyak 15 shifts)