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Physics with Strange Hadrons at the S torage Ring for A nti- P rotons Physics Highlights Double Hypernuclei H-Dibaryon Properties of Baryons Experimental.

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Presentation on theme: "Physics with Strange Hadrons at the S torage Ring for A nti- P rotons Physics Highlights Double Hypernuclei H-Dibaryon Properties of Baryons Experimental."— Presentation transcript:

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2 Physics with Strange Hadrons at the S torage Ring for A nti- P rotons Physics Highlights Double Hypernuclei H-Dibaryon Properties of Baryons Experimental Details Darmstadt,

3 1. Physics Highlights GLUON NUMBER BM QUARK NUMBER HYBRIDS GLUE BALLS DI-BARYONS

4 General Idea s u d s d d s d s s s s _ (Kaidalov & Volkovitsky) quark-gluon string model _ 0 Use pp Interaction to produce a hyperon beam (t~ s) which is tagged by the anithyperon or its decay products _

5 - capture: - p + 28 MeV Production of Double Hypernuclei - 3 GeV/c Kaons _ trigger p _ 2. Capture of in secondary target nucleus 2. Capture of in secondary target nucleus 1. Hyperon- antihyperon production at threshold 1. Hyperon- antihyperon production at threshold +23MeV up to 500 -events per day ! 3. -spectroskopy with Ge-detectors 3. -spectroskopy with Ge-detectors

6 - capture - capture -atoms: x-rays conversion - (dss) p(uud) (uds) (uds) Q = 28 MeV Conversion probability approximatly 5-10%

7 Hypernuclei and Deconfinement Quark Configuration u d s Baryon Configuration p n s p s p 5 He 4 He

8 W su du sd dd Tamura et al. Single Hypernuclei YN interaction in nuclear medium Nuclear structure non-mesonic weak decays p pn n nn weak baryon-baryon Interaction Neutronenzahl Protonenzahl high resolution -spectroskopy with germanium detectors

9 Double Hypernuclei Multi-Hypernuclei are terra incognita, but they exist ! 1963: Danysz et al. 10 Be 1966: Prowse 6 He 1991: KEK-E B 1991: KEK-E176 3 non-mesonic decays 2001: AGS-E906 4 H (~15) 2001: KEK-E373 6 He NAGARA

10 Kerne as Femtolaboratory Kerne as Femtolaboratory H -Particle R.L. Jaffe (1977) free coalescence t ~ s nuclear breeder t ~ s neutron stars

11 S=-2 Nuclei and H-dibaryon states H-particle in nucleus free H (see e.g. T. Yamada, NP A691 (2001) 250c; (3q)+(3q) quark cluster model ) free H-dibaryon H-dibaryon in B =12.2 MeVB =24.0 MeV

12 Contributions to intrinsic quadrupole moment of baryons One-gluon exchange Meson exchange J=1/2 baryons have no spectroskopic quadrupole moment - Baryon: J=3/2 long mean lifetime 0.82· s only one-gluon contributions to quadrupole moment (A.J. Buchmann Z. Naturforsch. 52 (1997) ) Fundamental Properties of Baryons s s s

13 A very strange Atom atoms by produktion hyperfine splitting in -atom electric quadrupole moment of prediction Q = ( ) fm 2 E(=10=9) ~ 515 keV E Q ~ few keV for Pb - spin-orbit Es ~ ( Z) 4 m quadrupole E Q ~ ( Z) 4 Q m 3 spin-orbit Es ~ ( Z) 4 m quadrupole E Q ~ ( Z) 4 Q m 3 Q = fm 2 Q = fm 2 high resolution -spectroscopy

14 Experimental Details

15 - properties - properties minimal distance production capture initial momentum MeV/c range ~ few g/cm 2 - mean lifetime ns

16 Detektorkonzept hermetic (4 ) high rate PID (, e,,, K, p) trigger (e,, K, D, ) compact () modular Elektronenkühler Injektion Kicker Septum Solid state-micro-tracker thickness ~ 3 cm High rate Germanium detector

17 The Solid State Micro Tracker electronic emulsion detector real time tracking of incoming - decay products (p, ) different absorbers as secondary target two posibilities capillar detector (2D) pixel detector (3D) NAGARA

18 Capillary-Detektor glas capillary filled with liquid scintillator 20 m - interaction (CHORUS) fast readout: hybrid-photomultiplier+ALICE pixel chip ?! only 2D projection

19 CMOS Monolythic Active Pixel Sensor Technology borrowed from digital still and video cameras p well pixel circuit industrial fabrication process (low cost) system-on-a-chip (amplifier, ADC...) good spatial resolution (~1 m) thin (20-50 m seems possible) example: MIMOSA Chip (IReS/LEPSI) charge collection by diffusion time ns

20 Prospects for MAPS The good performance of CMOS MAPS in charge particle detection has been successfully demonstrated with small scale prototypes: ~99%, ~ m, S/N~20-40 Further optimization of the sensitive element design is under way Large scale prototype sensors (2x2 cm2 - 12x2 cm2) are expected soon (0.6 mm AMS process) Development of an advanced design of processing electronics with more functionalities at a pixel and chip levels, more data processing on-chip, data sparsification – a major task Sensor radiation hardness is expected to be improved via design studies R&D program on CMOS MAPS TESLA VD in a collaboration with several other centers just started – aim for the detector design by Yu. Gornushkin 7th International Conference on Advanced Technology and Particle Physics, 17 /10/2001

21 Setup beam: 3 GeV/c, 1mm; no halo (roman pots?) Tracking detector for cm thick sandwich structure (50 m+150 m) secondary target support, cooling p - - readout primary target secondary target pixel detector

22 Conclusion Strange baryons offer a unique and important complement to the presented program at the Storage ring for Anti Protons. Many interesting technical challenges: Solid state micro tracker high rate germanium array GLUON NUMBER BM QUARK NUMBER HYBRIDS GLUE BALLS DI-BARYONS

23 Das HESR Team T. Barnes, D. Bettoni, R. Calabrese, W. Cassing, M. Düren, S. Ganzhur, A. Gillitzer, O. Hartmann, V. Hejny, P. Kienle, H. Koch, W. Kühn, U. Lynen, R. Meier, V. Metag, P. Moskal, H. Orth, S. Paul, K. Peters, J. Pochodzalla, J. Ritman, M. Sapojnikov, L. Schmitt, C. Schwarz, K. Seth, N. Vlassov, W. Weise, U. Wiedner HESRHESRHESRHESR Quarks, quarks, quarks.


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