STARS

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STARS ( STRIPES?) _at_ Gammasphere C.W.B. and
Mitch Allmond (for the LLNL/LBNL/Richmond
Collaboration)
STARS Silicon Telescope Array for Reaction
Studies
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STARS-LiBerACE at the 88-Inch at LBNL
raytrace
g
.14mm
.5mm
1mm
1mm
p
d Beam _at_ 2129 MeV
235U

12C
fis
Fission-E
DE
E1
E2
Si Det
Si Det
Clover (6 in all)
400 mg/cm2 target with 12C backing

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STARS and Liberace Used at LBNL for a variety
of reaction / structure experiments including the
surrogate reaction program STARS Charge
particles and fission About 20 geometric
efficiency Liberace 6 Clover detectors
About 1 gamma efficiency
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235U(d,p)236U as surrogate for 235U n
235U(d,pg ) 236U
p-g
p-f
235U(d,pf ) 236U
Light mass fragment.
Heavy mass fragment
Relative Energy
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Internal Ratio Result for 235U(n,g)
ENDF
J.M. Allmond et al. Phys. Rev. C79, 054610 (2009).
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particle gamma gamma 2 105 events in matrix
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Summary Count Rate Liberace 1 vs.
Gammasphere 9 Particle gamma Increase by
factor of 9 Particle-gamma-gamma increase by
factor of 80! STARS ( STRIPES ???) Chamber
exists which has run at Gammasphere in the
past! 96 channel feedthrough (3 S2
detectors) Preamps and analog electronics
available up to ADC (possibly digital
also?) Interest and effort available from
Richmond (CWB, Mitch Allmond) and Livermore
(Jason Burke, Lee Bernstein) in bringing STARS to
Gammasphere