CR RESR
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CR RESR NESR Light-ion scattering Elastic (p,p), (,) … Inelastic (p,p’), (,’) ... Charge exchange (p,n), ( 3 He,t), (d, 2 He) … Quasi-free (p,pn), (p,2p), (p,p) … Transfer (p,t), (p, 3 He), (p,d), (d,p) … ~ 10 … ~ 740 MeV/nucleon Key physics issues • Matter distributions (halo, skin…) • Single-particle structure evolution (magic numbers, shell gaps, spectroscopic factors) • NN correlations, clusters • New collective modes (different deformations for p and n, giant resonances strengths) • Astrophysical r and rp processes (GT, capture…) • In-medium interactions in asymmetric and low-density matter EX otic nuclei studied in L ight-ion induced reactions at the NESR storage ring
description
CR RESR. NESR. EX otic nuclei studied in L ight-ion induced reactions at the NESR storage ring. Key physics issues Matter distributions (halo, skin…) Single-particle structure evolution (magic numbers, shell gaps, spectroscopic factors) NN correlations, clusters - PowerPoint PPT Presentation
Transcript of CR RESR
CRRESR NESR
Light-ion scattering
Elastic (p,p), (,) …
Inelastic (p,p’), (,’) ...
Charge exchange (p,n), (3He,t), (d,2He) …
Quasi-free (p,pn), (p,2p), (p,p) …
Transfer (p,t), (p,3He), (p,d), (d,p) …
Light-ion scattering
Elastic (p,p), (,) …
Inelastic (p,p’), (,’) ...
Charge exchange (p,n), (3He,t), (d,2He) …
Quasi-free (p,pn), (p,2p), (p,p) …
Transfer (p,t), (p,3He), (p,d), (d,p) …
~ 10 … ~ 740 MeV/nucleon
Key physics issues
• Matter distributions (halo, skin…)
• Single-particle structure evolution(magic numbers, shell gaps, spectroscopic factors)
• NN correlations, clusters
• New collective modes (differentdeformations for p and n, giant resonances strengths)
• Astrophysical r and rp processes (GT, capture…)
• In-medium interactions in asymmetric and low-density matter
Key physics issues
• Matter distributions (halo, skin…)
• Single-particle structure evolution(magic numbers, shell gaps, spectroscopic factors)
• NN correlations, clusters
• New collective modes (differentdeformations for p and n, giant resonances strengths)
• Astrophysical r and rp processes (GT, capture…)
• In-medium interactions in asymmetric and low-density matter
EXotic nuclei studied in Light-ion induced reactions at the NESR storage ring
RIB (740 MeV/nucleon)
RESRDeceleration (1T/s) to 100 - 400 MeV/nucleon
Collector RingBunch rotation
Fast stochastic cooling
NESRElectron cooling
Experiments
Later stage of FAIR
EXL Set-up – Concept and Design Goals
Internal gas-jet target (>1014 cm-2)
Detection systems for:
• Target recoils (p,,n,…
• Forward ejectiles (p,n,)
• Heavy fragments
Design goals
• Universality: applicable to a wide class of reactions
• High energy and angular resolution
• Fully exclusive kinematical measurements
• High luminosity (> 1028 cm-2 s-1)
• Large solid angle acceptance
• UHV compatibility (in part)
Big R&D effort needed!
Challenging requirements:• High efficiency and universality• High angular and energy resolutions• Low threshold• Large dynamic range• High granularity• Vacuum compatibility• …
EXL
Recoil & Gamma
Array
EXL Gamma & Particle Array
EXL Silicon Particle Array
Phase I
Phase II
Si DSSD 300 m thick, spatial resolutionbetter than 500 m in x and y, E 30 keV (FWHM).
Thin Si DSSD <100 m thick, spatial resolution better than 100 m in x and y, E 30 keV (FWHM).
Si(Li)9 mm thick, large area 100x100 mm2, E 50 keV (FWHM).
CsI crystals High efficiency, high resolution, 20 cmthick.
Design study• Thin DSSD• PSD with DSSD• Integrated devices E-E monolitic• MAPS• Si(Li)• CsI and other crystals• Vacuum chamber
Choice of detector types for the baseline scenarioof the EXL Recoil & Gamma Array
Synergy with R3B & NUSTAR.
Mass identification
Mass & charge identification
Lower thresholds
Energy – Position – Identification
Characteristics of EGPA (EXL Particle and Gamma Array)
• Detect both s and charged particles
• Gamma sum energy, and individual energies
• 95% 4 coverage, =80% for E= 2-4 MeV
• Stopping 300 MeV protons E = 2-3% for s and 1% for fast protons
• Bins in polar angle of 1o-4o for Doppler Correction
• Total of about 1500 crystals of 20 cm in length
• 2 Phases : 1.7 + 0.6 M€ if CsI
The MUST2 Array
•Compact and efficient: bound and unbound states• -particle coincidences•Examples : (,6Be) with cryogenic target 2-nucleon transfer for pairing studies 2-proton decay measurementsIPNO-GANIL-SACLAY collaboration
MATE MATE for Si, Si(Li) & CsIfor Si, Si(Li) & CsI
16 ch 16 ch
AmpSlow
Amp Fast
TACMultiplex
MULTIPLEXER
PULSER
Disc LE
HT
Stop
TrackHold
PAwide band+/-ve
MUFEE
MATE
6 mm
Slow ControlGain, Disc ..
MATE - PerformanceMATE - Performance
• 16 Channels (Fast & Slow)– Bipolar (slow & fast)– Slow Control – Energy (Track & Hold)
• 1µs/3µs RC-CR
• 0.3 - 50/250MeV (1:800)• 25/90 KeV
– Time• Disc Leading Edge • TAC (300nsec)• 240 psec jitter
• Chip 36mm²– BCMOS 0.8 µ – 16000 transistors– 35 mWatt/channel
• Serial output 2 MHz
6 mm
What is New What is New ??- In Nuc. Phys. Env. new- Dynamic Range 1:800 new- Time & Energy new
And it’s functioning !
R&D Detection Group
Gaseous DetectorsWire Chambers, MPGD
ALICE @ CERNHADES @ GSI
ScintillatorsPhotomultipliers
G0 & DVCS @ Jefferson LabP.AUGER Observatory
http://ipnweb.in2p3.fr/~rddHead : Joel Pouthas5 Engineers3 Technicians (Mechanics)2 Technicians (Electronics)4 Technicians (Assembling Detectors)1 Secretary (part time)
3 Clean Rooms 3D measuring Machine
Jefferson Lab.@ Newport News Jefferson Lab.@ Newport News DVCS / CLAS DVCS / CLAS
424 crystals, 160 mm 424 crystals, 160 mm long, long,
APD readoutAPD readout
20022002 R&D R&D20032003 Construction of a prototype Construction of a prototype2004 (Jan) Prototype test on beam2004 (Jan) Prototype test on beam20042004 Final design and construction Final design and construction2005 (Mar) Experiment2005 (Mar) ExperimentPROTOTYPE 100 Crystals
Inner Inner calorimetercalorimeter (PbWO(PbWO44))
MechanicsMechanics
Jefferson Lab.@ Newport News Jefferson Lab.@ Newport News DVCS / CLAS DVCS / CLAS
2 GeV electron2 GeV electron
Electromagnetic Electromagnetic ShowerShower
SimulationSimulation
Geant 4 simulationGeant 4 simulation
Jefferson Lab.@ Newport News Jefferson Lab.@ Newport News DVCS / CLAS DVCS / CLAS
GSI @ Darmsdat GSI @ Darmsdat PANDA PANDA / / EMEM CalorimeterCalorimeter
Beginning of studiesBeginning of studies
September 2004September 2004
StudiesStudiesMechanicsMechanicsThermalThermalIntegrationIntegration
SimulationsSimulationsGeant 4Geant 4
R&D PrototypesR&D Prototypes
GSI @ Darmsdat GSI @ Darmsdat PANDA PANDA / / EMEM CalorimeterCalorimeter
Carbon Cells Carbon Cells
GSI @ DarmsdatGSI @ DarmsdatEXLEXL
A Few Questions to Address
• Do we need 2 calorimeters for EXL and R3B?
• Why does the EXL calorimeter have 1500 modules and the R3B 10000?
• Do we need sum energy for EXL applications? (i.e how important is 4 coverage?)
• Is CsI the best material? (see Jürgen Gerl’s talk). Do we need cooling?
• Will APDs give sufficient dynamic range, or do we need PMTs?
• Does EGPA need vacuum?
• ….
How can we (IPNO) help answer• Produce a first complete realistic mechanical design.
Engineering time will be available starting october.
• Do detailed Géant 4 simulations of some specific experimental situations (A post doc, Flore Skaza, has been hired for one year and will start in sept.)
• Do studies on materials?
• We are willing to contribute to both EXL and R3B.
• We need to co-ordinate with other groups and labs.
