Nucleus-nucleus collisions at the future facility in Darmstadt - Compressed Baryonic Matter at GSI Outline: A future accelerator for intense beams of (rare) ions and antiprotons The CBM experiment: Exploring dense baryonic matter Observables Technical challenges and solutions Peter Senger
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Nucleus-nucleus collisions at the future facility in Darmstadt - Compressed Baryonic Matter at GSI Outline: A future accelerator for intense beams of.
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Nucleus-nucleus collisions at the future facility in Darmstadt -
Compressed Baryonic Matter at GSI
Outline:
A future accelerator for intense beams of (rare) ions and antiprotons The CBM experiment: Exploring dense baryonic matter Observables Technical challenges and solutions
Peter Senger
SIS 100 Tm
SIS 300 Tm
U: 35 AGeV
p: 90 GeV
Structure of Nuclei far from Stability
Cooled antiproton beam:Hadron Spectroscopy
Compressed Baryonic Matter
The future international accelerator facility
Key features:Generation of intense, high-quality secondary beams of rare isotopes and antiprotons.Two rings: simultaneous beams.
Ion and Laser Induced Plasmas:
High Energy Density in Matter
The phase diagram of strongly interacting matter
CERN-SPS, RHIC, LHC: high temperature, low baryon density
AGS, GSI (SIS200): moderate temperature, high baryon density
Probing the Chiral phase transition
B 3-80 , T 130 MeV
Restoration of (spontaneously broken) chiral symmetry
Origin of hadron masses ?
The production of dense and/or hot hadronic matter
J/ experiments: a count rate estimate10 50 120 210 Elab [GeV]
Hadrons in the nuclear medium
SIS18 SIS300
SIS18: strangeness production at threshold probing in-medium properties at = 1 -3 0
SIS300: charm production near threshold probing in-medium properties at = 5 -10 0
Meson production in central Au+Au collisionsW. Cassing, E. Bratkovskaya, A. Sibirtsev, Nucl. Phys. A 691 (2001) 745
Charmed mesons
Some hadronic decay modes
D (c = 317 m):D+ K0+ (2.90.26%)
D+ K-++ (9 0.6%)
D0 (c = 124.4 m):D0 K-+ (3.9 0.09%)
D0 K-+ + - (7.6 0.4%)
experimental challenges:low production cross sectionlarge combinatorial backgroundmeasure displaced vertex with resolution of 30m
D meson production in pN collisions
The critical point
gasliquid
coexistence
Below Tc: 1. order phase transitionabove Tc: no phase boundary
At the critical point:Large density fluctuations,critical opalescence
Event-by-event analysis by NA49: 5% most central Pb+Pb collisions at 158 AGeV
Purely statistical fluctuations !
Produce high baryon densitiesin heavy ion collisions at 4 – 40 AGeV.
Build an universal experiment which measures simultaneously both hadrons and electrons: , K, , , , p, , , , , D, J/(multiplicities, phase-space distributions, centrality, reaction plane).
Perform systematic measurements using a dedicated accelerator:High beam intensity and duty cycle,Excellent beam quality,High availability
Our approach towards the study of superdense baryonic matter
Experimental challenges
beam intensities up to 109 ions/sec, 1 % interaction target: 107 Au+Au reactions/sec (1000 charged particles in central Au+Au collisions at 25 AGeV) determination of (displaced) vertices with high resolution ( 30 m)
identification of electrons and hadrons
Silicon: 7 planes, 3 Mio pixel, 1.5 Mio strips
Experimental concept
Radiation hard Silicon pixel/strip detectors
in a magnetic dipole field
2 electron detectors: pion suppression by 104- 105