Status of the TRACE array D. Mengoni University of the West of Scotland, Paisley - U.K. INFN - Sezione di Padova, Padova - Italy SPES workshop, LNL - Italy Nov 15 th 17 th, 2010
Outline 1 Introduction TRACE Principle 2 Ancillary detector AGATA Campaign 3 Plan&Fundings 4 Conclusion
Physics case The exotic matter: the neutron- and proton-rich nuclei Nuclear Physics π drip line high angular momentum deformed nuclei correlation (pairing) ν drip line shell evolution heavy elements origin r,p,s process stellar explosion X ray burst and supernovae neutron stars Nuclear Astrophysics
Physics case The exotic matter: the neutron- and proton-rich nuclei Nuclear Physics π drip line high angular momentum deformed nuclei correlation (pairing) ν drip line shell evolution SPES heavy elements origin r,p,s process stellar explosion X ray burst and supernovae neutron stars Nuclear Astrophysics
Introduction Direct reaction (Transfer,Coulex,...) as spectroscopic tool Transfer with RIBs Inverse kinematics Low intensity beams Detection: beam-like ejectile (spectrometer), target-like ejectile (Si det.) Positions of levels (Q-value) Spin and parities (Angular distributions) Spectroscopic factor (Cross sections) Constraints Energy (angular resolution) Efficiency Background target, beam tracker
Introduction FE as spectroscopic tool FE with Intense beam Direct kinematics High intensity beams Detection: light charged particles Channel Selection Doppler Correction Constraints Angular resolution Particel discrim. Efficiency Chilled target
TRACE Design TRacking Array for light Charged particle Ejectiles TRACE4,6,8 module pad layout E-E telescope array: 150µm and 1.5mm; high segmentation and high-count rate; digital PSA, 1E4 ch, 1 2 4x4 mm 2 at 10 cm; TRACE design: barrel, end-caps. simul
Deep Inelastic: 17 O(340MeV)+ 208 Pb Spokesperson:R.Nicolini&D.Mengoni - GQR in 207,208 Pb, 90 Zr Energy resolution (chilled) 0.4 % GQR (pigmy and fine structure) AD+TRACE+HELENA
TRACE MECHANICS cooling, angular range
TRACE ON-LINE DAQ modular electronics TRACE AGATA AGAVA ADC TDC AGATA digitizer AGATA digitizer FEE DAQ eth0 Producer TCP crystalframe Crystal Producer eth0 Crystal Producer Preproc Filter X 15 ranc eth0 Ancillary FilterTCP ranc1 Ancillary FilterATCA PSA Filter EVENT BUILDER ranc1 MERGER to tracking
Ministry fundings & organization 2 research units: D. Mengoni(PI), J. J. Valiente Dobón Research units Università di Padova: 300 ke-trace INFN-LNL: 300 ke-neda (FP7-Infrastructure:Task5.8) Collaboration Università di Padova INFN: LNL,Pd,Mi,Pg... TRACE NEDA D.Mengoni(PI) Univ Padova Electronics PSA FPGA algos PostDoc Detector ch. Sim optim Electronics PhD J.J. Valiente Dobon LNL INFN SYNERGY AGATA(coupling) GASPARD(ASICs) HYDE(PSA) AGATA,EXOGAM (electronics) HISPEC(scintillator) DESCANT(detector and PM)
Timescale 2011 2012 2013 2014 2020 NEDA TRACE AGATA LNL simulation electronics demonstrator
Perspectives GALILEO SPES AGATA Synergies GASPARD (SPIRAL2-GANIL) HYDE (FAIR-GSI)
Summary and conclusions Si array for DR and FE reactions; Coupling with gamma spectrometer (AD); GQR 208 Pb, 90 Zr: TRACE+AD+HELENA; final remarks Versatile set-up PSA on light ions and particles. integrated FEE TRACE Demo ready for SPES
Simulation: framework Event generator, radiation interaction, filter (PSA, tracking), data collection (matrices and spectra)
Simulation: framework other configuration TRACE6 TRACE8
Transparency Rotational cascade (M γ=30, v c =0) Full-energy eff.:probability to detect the total energy of any emitted photon individually Peak-to-total ratio: the ratio of full energy efficiency to the total interaction efficiency. Absolute photopeak eff. (%) Peak-to-total ratio (%) Absolute photopeak eff. (%) 50 45 40 35 30 25 20 A180 A180+Al chamber+euclides A180+Al chamber+trace4 A180+Al chamber+trace6 A180+Al chamber+trace8 15 0 500 1000 1500 2000 2500 3000 Energy (kev) Peak-to-total ratio (%) 100 80 60 40 A180 A180+Al chamber+euclides 20 A180+Al chamber+trace4+asics A180+Al chamber+trace6 A180+Al chamber+trace8 0 0 500 1000 1500 2000 2500 3000 Energy (kev)
Particle discrimination TRACE E E matrices, 32 S(125 MeV)+ 40 Ca Bethe-Block expression: de dx MZ 2 z E E de is a characteristic of the impinging particle. dx TRACE8 TRACE4 Energy loss (a. u.) Energy loss (a. u.) 2α 2α p αp α 2p Residual energy (a. u.) p α p α 2p Residual energy (a. u.)
Multiple hit probability and efficiency TRACE8 Multiple hit event: more than one particle hits simultaneously the same segment Probability P(M,k) to detect k particles over M emitted Assumed isotropic fusion-evaporation (M=6), 1000 pads with 8x8 mm 2 dim. P(M, 0)+P(M, 1) 99% Efficiency: broadening of the measured fold P(M, k) P(M, k 1) = ε α = 40%, ε p = 50% for 32 S(125 MeV)+ 40 Ca, γ 2 + 0 + 64 Ge(2α), γ 2 + 0 + 70 Se(2p)
Doppler correction TRACE8 Doppler broadening uncertainty in the photon emission angle uncertainty in the recoil energy intrinsic detector resolution FWHM (kev) 6.5 6 5.5 5 4.5 4 3.5 3 2.5 2 transfer v/c=6.4% transfer v/c=7.8% fusion v/c=5.0% fusion v/c=5.7% 0 1 2 3 4 5 6 7 8 Segmentation (mm 2 ) E γ /E γ (%) 1.2 1 0.8 0.6 0.4 0.2 β = 1% θ = 0.5 v/c=15% v/c=10% v/c= 5% 0 0 20 40 60 80 100120140160180 Angle (deg)
Ancillary comparison TRACEx, EUCLIDES TRACE4 TRACE6 TRACE8 EUCLIDES Telesc 40 52 48 40 Crys shap (E) 3 5 4 3 Channels(E E) 2856 183E3 2435 156E3 2304 148E3 110 Rate (khz) 1 80 1 80 1 80 200 Chan selec E E E E E E E E Abs.ph.eff. (%) 26.6 26.84 27.82 26.0 P/T (%) 58.49 59.57 59.26 58.46 FWHM (kev) - - 2.5 5.5 7 8 Solid angle (%) 90 <90 <90 80(exp) Eff (%) 55,42(sim) 52,38(sim) 53,40(sim) 50,40(exp) Mass (E E, g) 705.5 601.6 569 107.4 Vol (E E, cm 3 ) 302.8 258.2 244.3 46.1
Conclusion Telescope specifications Detector: Silicon. Geometry & dimensions: solid angle coverage 90%; counting rate: 20 khz; module dimensions 40 x 80 mm 2 ; E: Si-pad det. 150 µm thick, pad 4x4 mm 2 ; E: Si-pad det. 1.5 mm thick, pad 4x4 mm 2. Angular resolution: 1 2 4x4 mm 2 at 10 cm. Energy resolution: <50 kev for 5.5 MeV α-particles. Wide energy range: 200 kev 15 MeV for p, 60 MeV for α-particles. Pulse shape analysis simul
Collecting electrodes α family proton family 1e 04 3_MeV 5_MeV 10_MeV 30_MeV 3e 04 3_MeV 5_MeV 10_MeV 30_MeV 8e 05 2e 04 Current (A) 6e 05 4e 05 Current (A) 1e 04 2e 05 1e 10 1e 09 1e 08 1e 07 1e 06 1e 05 Time (s) 1e 10 1e 09 1e 08 1e 07 1e 06 1e 05 Time (s)
Neighbour electrodes α family proton family 3_MeV 5_MeV 10_MeV 30_MeV 30_MeV 10_MeV 5_MeV 3_MeV 0 2e 06 Current (A) 1e 06 Current (A) 0 2e 06 2e 06 3e 06 1E 10 1E 9 1E 8 1E 7 1E 6 1E 5 Time (s) 1E 10 1E 9 1E 8 1E 7 1E 6 1E 5 Time (s) psa
TRACE first in-beam experiment 17 O(350 MeV)+ 208 Pb 2x120ch (high density con.), 2.5 ang res, 2x12.5 ang range. TRACE+HELENA TRACE telescope
FEE&DAQ Electronics coupling FEE
Cooling system Noise reduction Ceramic PCB 2 Peltier cell(2x18w) water chiller(300 W,18 bar) Thermal noise generation
Results Mass&Energy resolution Isotopic separation: O,N,C, etc Si Energy resolution 0.45%