eos samurai-tpc - lawrence berkeley national … · tetsuya murakami eos samurai-tpc t. murakamia,...
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Department of Physics
Kyoto University
Tetsuya MURAKAMI
EOS SAMURAI-TPC
T. Murakamia, Jiro Muratab, Kazuo Iekib, Shunji Nishimurac, Yoichi Nakaic, Betty Tsangd, Bill Lynchd, Dan Couplandd, Abigail Bickleyd, Michael A. Famianoe, Lee Sobotkaf, Robert Charityf, Demetrios Sarantitesf, Sherry Yennellog, Roy Lemmonh, Abdou Chbihii, Giuseppe Verdej, Z.Y. Sunk, Wolfgang Trautmannl
aKyoto University, bRikkyo University, cRIKEN, Japan, dNSCL Michigan State University, eWestern Michigan University, fWashington University, gTexas A&M University, USA, hDaresbury Laboratory, iGANIL, France, UK, jLNS-INFN, Italy, kIMP, Lanzhou, China, lGSI, Germany
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About six-seven years ago
/)( pn
2)()0,(),( symEEE
)0,()1,(),(
2
1)(
0
2
2
EEE
Estm
Bill Lynch and I started discussing on possible
nuclear reaction experiments using RIBF.
Constraining the symmetry energy at supra-saturation densities 20.
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Au+Au
?
MSU
RIBF
GSI
Isospin diffusion, n-p flow
Pion production
RIBF can constrain
the symmetry
energy at ~ 20.
Requires data with
controlled
variations in system
asymmetry
Xia
o, e
t al., a
rXiv
:08
08
.01
86
(20
08
)
Reis
do
rf, et a
l., NP
A 7
81
(20
07
) 45
9.
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Zh
an
g e
t al., a
rXiv
:09
04
.04
47
v2
(20
09)
Choice of beams and facilities for pion ratios
Xia
o, e
t al., a
rXiv
:0808.0
186 (2
008)
Reis
do
rf, et a
l., NP
A 7
81 (2
007) 4
59.
Choice of facility is governed by availability of beams and equipment:
Sensitivity to symmetry energy is larger for neutron-rich beams
Largest sensitivity requires rare isotope beams such as 132Sn and 108Sn.
Sensitivity increases with decreasing incident energy.
Most sensitive measurements of -/ + ratios would be with beams
available at RIBF or FAIR.
Measurements require floor-space and a magnet suitable for a TPC;
this is not currently within the FAIR project.
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Comparison of SAMURAI with EOS(HISS)
Gap ~80 cm(expected) Gap=100 cm
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Propose to build a TPC for use within the gap of the SAMURAI dipole.
The SAMURAI TPC would be used to constrain the density dependence of the symmetry energy through measurements of:
– Pion production
– Flow, including neutron flow
measurments with the nebula
array.
Device: SAMURAI TPC
Nebula scintillators
SAMURAI dipole
TPC
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Proposed Research program
Typical rates at 104/s are 3-4 pions/s of each charge and about
5 n’s/s
Goal is to run up to 105 /s
Probe Devices Elab/A
(MeV)
Part./s Main
Foci
Possible
Reactions
FY
+-,p,
n,t,3He
TPC
Nebula
200-300
350
104-
105
Esym
mn*,
mp*
132Sn+124Sn, 105Sn+112Sn,52Ca+48Ca, 36Ca+40Ca124Sn+124Sn, 112Sn+112Sn
2013
-2014
+- p,
n,t,3He
TPC
Nebula
200-300 104-
105
nn,p
pnp
100Zr+40Ca, 100Ag+40Ca, 107Sn+40Ca, 127Sn+40Ca
2015
-2017
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Performance of EOS-TPC
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TPC properties
SAMURAI TPC
parameters
Pad plane area 1.3m x 0.9 m
Number of
pads
11664
(108 x 108)
Pad size 12 mm x 8 mm
Drift distance 55 cm
Pressure 1 atmosphere
dE/dx range Z=1-3 (Star
El.), 1-8 (Get
El.)
Two track
resolution
2.5 cm
Multiplicity limit 200 (large
systems
absolute pion
eff.)
• Good efficiency for pion track reconstruction is essential.
• Initial design is based upon EOS TPC, whose properties are well documented.
GEANT simulation 132Sn+124Sn collisions at E/A=300 MeV
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Electronics upgrade
Initial experiments 2013-2014 would be performed with STAR TPC electronics.
Used at MSU for S800 spectrograph and tracking detectors.
STAR ADC is 10 Bit; data rate is <100 events/s.
Limits dynamic range of resolved particles
To increase dynamics range and resolution, new GET electronics, would be installed in 2014.
resolution of SAMURAI TPC,
nSimulated eglecting ADC dynamical range problem.
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GET:GENERAL ELECTRONICS FOR TPC
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Coordination Board:Abigail Bickley NSCL/MSU
Atsushi Taketani RIKEN
Bertram Blank CENBG
Jean-Louis Pedroza CENBG
Emanuel Pollacco IRFU/Saclay
Patricia Chomaz GANIL
Ricardo Raabe GANIL
Tetsuya Murakami Kyoto/RIKEN
Frederic Druillole IRFU/Saclay
Wolfgang Mittig NSCL/MSU
Preparing MOU
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ADDITIONAL PHYSICS CAN BE COVERED BY TPC
The TPC also can serve as an active target both in the
magnet or as a standalone device
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Traditional EOS Study
Multifragmentation of Participant Zone
TPC is ideal 4π detector.
Good acceptance for all Z
Coherent analysis of numerous observables
Fix Atot, Plot vs. E/A -- Minimize finite-size
effects
Can be used as a replacement of well used
4π Detector like INDRA, ISiS and so on.
EOS TPC has already shown the capability.
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Symmetry Energy
Besides π-/π+ ratios
Pion flow
Neutrons & Protons
Relative energy spectra
Differential flow
Balance energy
Charged Fragments
t/3He ratio, 3He/4He ratios,6Li/7Li ratios, 6He/6Li flow
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Fission Asymmetry dependence of fission barriers
Using H, He gas in
TPC
Track to find interaction
point (E). Get the entire
excitation function at one
bombarding energy
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Multi-particle Final State
Looking for New kinds of Cluster states
like 12Be→6He+6He
Coulomb dissociation into p+HI(neutron-
rich)
Large relative energy can be covered by
TPC.
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Nuclear Structure Experiments - (Active Target)
Inelastic Scattering at intermediate energies
• (p,p’) or (α,α’) inverse kinematics, 100-200MeV/n
precise information on decay branch.
• Giant resonance studies to access nuclear compressibility
We should use lower energy beam!!
<100 MeV/nucleon
Charge Exchange Reactions
• AZ(p,n)A(Z+1), AZ(3He,t)A(Z+1) AZ(d,2He)A(Z-1)
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Announcement
We are going to hold an international
symposium on “symmetry energy” in last
week of July 2010.
Please join SAMURAI-TPC project
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