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Study of Multiple Production in 4 p    -geometry and Construction of the SPHERE Spectrometer.

Topic – 03-1 0983-92/2004. Study of Multiple Production in 4 p    -geometry and Construction of the SPHERE Spectrometer. First-Line Experiments at the Nuclotron. Project: Sphere. A.Litvinenko, LHE, JINR. litvin@moonhe.jinr.ru. Outline. Introduction Detector Supposed experiments

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Study of Multiple Production in 4 p    -geometry and Construction of the SPHERE Spectrometer.

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  1. Topic – 03-1 0983-92/2004 Study of Multiple Production in 4 p   -geometry and Construction of the SPHERE Spectrometer. First-Line Experiments at the Nuclotron. Project: Sphere A.Litvinenko, LHE, JINR litvin@moonhe.jinr.ru

  2. Outline. • Introduction • Detector • Supposed experiments • Results • Detector • Experimental data • Conclusions

  3. Study of Multiple Production in 4 p    -geometry and Construction of the SPHERE Spectrometer. First-Line Experiments at the Nuclotron History • 1992 --- Approved by PAC for Nuclear Physics • 1997 --- Prolonged by PAC for Nuclear Physics • 2001 --- Prolonged by PAC for Nuclear Physics

  4. SPHERE project • The SPHERE detector construction. • The study of the reactions of cumulative particle production. • The study of polarization observables in fragmentation of the deuteron into cumulative hadrons. • The study of nuclear excitation in exchange reactions. • The study of the hypernucleus property. • The study of region of cumulative particle on internal target (HBT for pp). • The study of pions interaction with nuclei. (AMPIR+SPHERE)

  5. The SPHERE Spectrometer

  6. The SPHERE Spectrometer Trailers Superconducting solenoid

  7. The SPHERE Spectrometer Magnetic channel, forward spectrometer Cables >10 km

  8. The SPHERE Spectrometer Electronics Forward Spectrometer Internal Target

  9. The Results Cumulative particles production. Definition 1. Subthreshold 2.

  10. Cumulative muon pair production

  11. Atomic mass dependence (I) The spectrum shape is independent from multiplicity

  12. Atomic mass dependence (II) Formation length for 3 GeV/c pions ~ 2 fm

  13. Atomic mass dependence (III) Twice cumulative particle (high momentum components in both colliding nuclei) Cross section Preliminary

  14. Polarization observable (I) Vector Analyzing Power Reduction at Polarized ProtonScattering on Intranuclear Nucleons (SMS MSU – SPHERE LHE Experiment) The anomalous analyzing power reductionis not observed

  15. Polarization observable (II) The study of deuteron spin structure in experiment with cumulative hadrons production (SPHERE + TENSOR20, SPHERE+PIKASO) Squares -- Circles-- Trian. Down-- Trian. Up -- • Strong contradiction wit impulse approximation (light front dynamics) • DWF looks like isotropic

  16. Polarization observable (II) • Visible anisotropy • Sign is opposite Lilac Black Blue (Preliminary)

  17. Polarization observable (III) Cumulative protons at non zero angles L.S.Azhirei,N.P.Yudin,7thInt.Workshop,.p.159, Stara Lesna, Sloval Rep., (2003 ).Will be published in Yad.Fiz. Data can be described by covariant light front approach (Karmanov)

  18. Internal Target (I) SCAN- project

  19. Internal Target (I) SCAN- project The radius of the emission zone is insensitive to the type of primary particles A radii is slowly growing with increasing the measurement angle

  20. Internal Target (II) SCAN- project No depolarization at shown energy

  21. R&D for the external experiment

  22. CONCLUSIONS (0) • Five Ph.D. theses • One doctor of sience • Reports on a lot of Conferences (some of them) • SPIN 1996, 2000, 2004 • FB 1998, 2000, 2002 • ISHEPP 1992,1994,…,2004,2004

  23. CONCLUSIONS (I) At present, in the conditions of insufficient funding, it is impossible to complete creation of the full scale set up. Many projects, including those carried out jointly with other laboratories and institutes (NIS, SMS MSU, etc.) have used and are planning further use of elements of the “SPHERE” set up (in particular, the created forward spectrometer).

  24. CONCLUSIONS (II) The following recommendations are proposed: 1. To close the project “SPHERE”, due to insufficient financing and impossibility to complete building the full-scale “SPHERE” set up; 2. To use the equipment created in the framework of the project “SPHERE” for research in the frames of the existing and planned projects; 3. To substitute the title of the topic 03-1-0983-92/2004 with the following: “Study of multiparticle processes in 4-geometry. Preparation and conduction of experiments at the Nuclotron” and prolong it for three years with the first priority;

  25. Backup slides

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