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RARE ISOTOPES, RARE EVENTS and ACTIVE TARGET DETECTORS for STUDIES WITH EXOTIC BEAMS
present and next future
Wolfgang Mittig MSU-NSCL
Paris December 15th 2014
Click to edit Master title style RARE ISOTOPES, RARE EVENTS and - - PowerPoint PPT Presentation
Click to edit Master title style RARE ISOTOPES, RARE EVENTS and - - PowerPoint PPT Presentation
Click to edit Master title style RARE ISOTOPES, RARE EVENTS and ACTIVE TARGET DETECTORS for STUDIES WITH EXOTIC BEAMS present and next future Wolfgang Mittig MSU-NSCL Paris December 15 th 2014 Relevant Questions Best Tools Accel., exp.
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FRIB: Facility for Rare Isotope Beams
High Intensity Heavy Ion Beams: 200MeV/n 400kW O to U
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Nucleo-synthesis in r-process
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X-ray bursts
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Why an Active Target-TPC?
- Nuclear Structure Investigations of
Exotic Nuclei with Secondary Beams 1) from normal kinematics to inverse kinematics
beam target p,d,3He
12C,40Ca 18C,32Mg
p,d,3He
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Why an Active Target-TPC?
- Nuclear Structure Investigations of
Exotic Nuclei with Secondary Beams 1) from normal kinematics to inverse kinematics
beam target p,d,3 He
12C,40Ca 18C,32Mg
p,d,3He
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Normal kinematics versus inverse kinematics
- Example: d(32Mg,33Mg)p gs,100keV
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Beam Intensity ~10-9 with respect to stable beams
Thick Targets without resolution loss: tracking of reaction vertex High detection efficiency: 4π
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I.Tanihata et al., PRL 100, 192502(2008)
Experiment at Triumf-Isac 1-2*103 11Li/s
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Experiment at Triumf-Isac 1-2*103 11Li/s
- G. Potel et al., Phys. Rev. Lett. 105 (2010)172502
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Soft Giant resonance in 68Ni by (a,a’)
- M. Vandebrouck et al., Phys. Rev. Lett. 113, 032504 (2014).
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Nuclear Equation of State: Cluster States from low density gas to nuclear systems
Low density gas: chemical equilibrium n,p,d,a,… Nuclei: r=r0 n p a d
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Nuclear Equation of State: Cluster States from low density gas to nuclear systems
Low density gas: chemical equilibrium n,p,d,a,… Nuclei: r=r0 Low density nuclei: Loosely bound clusters: r~r0/10 n p a d
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Cluster States: from low density gas to nuclear systems
22C AQMD calculation by Xi-Guang Cao et al.,
private communication, RMS=3.689(3.0) fm
….,M.Girod,… constrained HFB
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14C (T.Suhara(Kyoto)and Y.Kanada-En’yo(YITP),2010)
Shell Model (Spherical)
14C
α α α n n
Equilateral-triangular (oblate) Linear-Chain (prolate)
Structures which are expected to appear on the (β、γ) plane α α α n n
Obtuse-angle triangular (triaxial)
α α α n n n α α α
Excess neutrons deform largely (triaxial)
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10Be+4He 14C
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Principle of detection- proto AT-TPC
Position
- >(x, y)
He, H, D …
e- e- e- e- e- e- e- e- e- e- e- e- e-
- 50 kVDC (1kV/cm)
Insulator gas volume N2 gas 30 kV/cm x 6 cm = 180 kV
NIM A 691 (2012)39 by D. Suzuki, et al.
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IAS 124,132Sn(p,p)
Tan Ahn et al., ANL-Caribu, March 2013 Low Gain
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Example: 2p decay of 45Fe
K.Miernik, PRL 99, 192501 (2007), Q2p 1:15 MeV
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P R
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Tentative of direct observation “democratic” 3 body decay of
12C(0+ 2, Hoyle state) in the 3 dim 10Torr isobuthane G.Astier
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55cm diameter 10000 pads 5000 pads routed by hand, 8 Layers PCB: MSU Bulk: CEA-IRFU
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IRFU, GANIL, CENBG MSU
For different detectors AT-TPC: ~10000channels Data flow at 1000cts/s 512*104*103*2 ~1010 bytes/s =10Gbytes/s before reduction
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TACTIC: York-TRIUMF Collaboration
Mizoi et al MSTPC
AT-TPC at MSU Actar-Ganil-Saclay- CENBG CNS-Riken
Anasen
Fission TPC LLNL
IKAR-GSI
Maya@Ganil
Prototype AT-TPC at MSU O-TPC at TUNL
?
R.Raabe MaiKo
OTPC Warsaw-ORNL
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- Operating Active Targets have largely improved
sensitivity for reactions by rare isotope beams; they have already produced many results
- The At’s need high dynamics, from several hundreds
keV to GeV, internal trigger and detector gases that contain the target wanted as pure as possible
- Promising subjects that can be particularly well studied
with AT-TPCs are: reactions with beams near dripline, low energy recoil reactions (quasi-elastic, giant resonances,…), multi-particle correlations near threshold as signature of cluster emission; rare decays
Conclusion
- W. Mittig TPC Paris January 15 2014
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AT-TPC Collaboration
Lawrence Berkeley National Laboratory I-Yang Lee, Larry Phair Lawrence Livermore National Laboratory Mike Heffner University Notre Dame Umesh Garg, Jim Kolata Michigan State University Daniel Bazin, Wolfgang Mittig, Bill Lynch, Z.Kooley, Fernando Montes, Daisuke Suzuki, Z. Chajecki, Tan Ahn, Saul Beceiro Novo Saint Mary's University (Canada) Rituparna Kanungo Western Michigan University Michael Famiano
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MAIKo RCNP OSAKA (-PIC based active target for inverse kinematics)
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R O B G r > 0 r < 0
6He beam 6He
α θlab TKE r = 0
6He +4He 2.5MeV/n AT-TPC proto at ND
- Phys. Rev. C 87, 054301 (2013)
Ereac
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Specifications
Large volume 100 cm x 60 cm e.g. D2 10 mg/cm2 @ 1 atm High granularity 10,000 pads, ~5 x 5 mm2 Bρ analysis Solenoid 2 T (Triumf)
Commissioning: spring2014
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Prototype Exp. 10Be+4He
A.Fritsch, S.Beceiro Novo
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- S. Beceiro Novo, F.Abu-Nimeh, D.Bazin,WM
10000 pads Triangles Small base 5mm Big base 10mm
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①, Shell Model ②, Triaxial (K=0) ③, Triaxial (K=2)
① ② ③ ④ ⑤
④, Linear-chain ⑤, Other states
ρp ρn ρn-ρp