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Technical status of RISING at GSI

Technical status of RISING at GSI. Outline. N. Saito - GSI for the RISING collaboration. Introduction Detector performance First results of RISING Coming experiments. RISING with fast beams. Fragment Separator (FRS). 400 – 1000 MeV/u. Rare isotope beam + Target. production

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Technical status of RISING at GSI

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  1. Technical status of RISING at GSI Outline N. Saito - GSI for the RISING collaboration • Introduction • Detector performance • First results of RISING • Coming experiments

  2. RISING with fast beams Fragment Separator (FRS) 400 – 1000 MeV/u Rare isotope beam + Target production target In-beam g- spectroscopy Degrader Beam : ~ 100 MeV/u > 1000 pps Reaction target ~ 0.5g/cm2 Ge-array

  3. Type of experiments • Coulomb excitation • With a Au target • Inelastic excitation enhanced • One step excitation • Low spin • Excitation to high energy • Secondary fragmentation • With a Be target • Weak inelastic excitation • Population of higher spin states

  4. Atomic Background Radiation Atomic g background cross section • X-rays from target atoms • Radiative electron capture (REC) • Primary Bremsstrahlung (PB) • Secondary Bremsstrahlung (SB) To measure g- ray above ~ 400 keV Beam energy ~ 100 MeV/u

  5. Bre A = b gc u Q FRagment Separator (FRS) Dipole magnets : Br selection 400~1000 MeV/u Multi-wire chambers : Tracking MUSIC : Z measurement ~ 100 MeV/u Fast plastic scintillator : Time of Flight (TOF) Degrader : DE

  6. Identification of beam Primary beam : 86Kr at 419 MeV/u Fragment setting : 56Cr 56Cr CATE

  7. 55Ni + 9Be 108Sn + 197Au DE vs E Z DE + E A Identification of outgoing particle CAlorimeter TElescope array CsI 5cm Si 5cm DESi Two-step fragmentation • CATE-Si • position sensitive • 0.3 mm thick Si • DE measurement • CATE-CsI • CsI + PIN diode • Stop beams • E measurement ECsI DZ ~ 0.7 DESi DA < 1 Coulomb excitation E CsI

  8. Beam spot reconstruction on the target y x Outgoing particle distribution on CATE y x Tracking of incoming & outgoing particles Event-by-event Doppler correction MW pos. res. ~ 1 mm g CATE MW MW Target Si CsI CATE-Si pos. res. ~ 5 mm opening angle ± 3° Qg Qp Impact parameters

  9. RISING Ge-array • 15 EUROBALL cluster detectors • Clusters at forward angle • Large Lorentz boost (b~0.4) • Optimum Doppler shift correction • Minimizing Doppler broadening • Ring1 at 15.9° 70 cm • Ring2 at 33.0° 70 - 140 cm • Ring3 at 36.0° 70 - 140 cm • Design (100MeV/u,1.3MeV g-ray ) • Option 1 : high resolution • DE = 1.0 % (FWHM) • e = 1.5 % • Option 2 : closest geometry • DE = 1.6 % (FWHM) • e = 2.8 %

  10. RISING detectors Target : Au or Be 15 EUROBALL cluster Ge detectors

  11. RISING detectors • HECTOR array : • 8 BaF2 detectors. • For GDR experiments. • Time resolution : ~1 ns. • Background study.

  12. RISING detectors CATE

  13. Data acquisition system

  14. No. Nuclei of Interest Primary Beam Spokespersons Experiment Type Accepted Request (days) 1 (S244) 34/36Mg 48Ca P. Mayet 2 step fragmentation lifetime 6 2 45Cr,53Ni,45Sc, 53Mn 58Ni M. Bentley 2 step fragmentation 7 3 68Ni 86Kr A. Bracco GDR 7 4 54Ca, 78Ni ,56Cr 86Kr H. Grawe, H. Hübel, P.Reiter Coulex 13 5 88Kr, 90Sr, 86Se 238U D. Tonev Coulex 10 6 102-110Sn, 94-98Ru 124Xe C. Fahlander, M. Górska Coulex 6 7 132Sn 238U G. de Angelis Knock-out 5 8 132Xe 136Xe A. Maj Coulex, Angular Distr. / Correlations 3 9 134Te 136Xe K.-H. Speidel Coulex, g-factor 7 10 185,186,187Pb 238U J. Gerl, A. Andreyev G.D. Dracoulis 2 step fragmentation lifetime 8 First accepted proposals 84Kr 84Kr Coulex, Ang. Corr. ~ 7 8’

  15. Coulomb excitation of stable 84Kr 84Kr at 113 MeV/u on a 0.4 g/cm2 Au • Conditions for the analysis : • Particle Identification before and after the target • Scattering angle selection 84Kr :0.5 ~ 2.5 degrees • Selection of one-step Coulomb excitation <Mg>=1 • 84Kr :b = 0.396 (b from TOF measurement) Without D.c. With D.c. 84Kr 2+ 0+ FWHM ~ 1.5 % Energy [keV] Energy [keV]

  16. Preliminary 56Cr 2+->0+ Coulex of radioactive beams 86Kr 419 MeV/u→56Cr 136 MeV/uon Au 1.0 g/cm2

  17. Ni Co Fe Mn Cr Ti Ca Ar S Si Two-step fragmentation 58Ni 600 MeV/u→55Ni 171 MeV/uon Be 0.7 g/cm2 CATE dESi Preliminary 2+ -> 0+ 50Cr 4+ -> 2+ 6+ -> 4+ (8+ -> 6+) CATE ECsI

  18. Schedule • 2004 • May : Two experiments at relativistic energies with HECTOR • GDR in 68Ni (A. Bracco) • Shell structure at N>>Z nuclei (H. Grawe, H. Hübel, P. Reiter) • Nov/Dec : Experiments at relativistic energies with MINIBALL

  19. MINIBALL emax = 7.4 % (MINIBALL at ~20cm)

  20. Schedule • 2004 • May : Experiments at relativistic energies with HECTOR • Nov/Dec : Experiments at relativistic energies with MINIBALL • 2005 • - April : Experiments at relativistic energies with MINIBALL • Autumn : Experiments with stopped beams • g-isomer decay • a- and b-decay • Lifetime measurements in ps~ns with electrical timing methods • 2006 • Experiments with relativisticbeams and stopped beams • Feasibility studies for experiments with slowed-down beams • Multiple Coulomb excitation • One- and two-particle transfer reactions • Fusion and deep inelastic reactions

  21. Ni Co Fe Mn Cr Ti Ca Ar S Si Two-step fragmentation 58Ni 600 MeV/u→55Ni 171 MeV/uon Be 0.7 g/cm2 Preliminary CATE dESi 52Fe 2+ -> 0+ 52Fe 4+ -> 2+ CATE ECsI

  22. RISING Ge-array • 15 EUROBALL cluster detectors • Clusters at forward angle • Large Lorentz boost (b~0.4) • Optimum Doppler shift correction • Minimizing Doppler broadening • Ring1 at 15.9° 70 cm • Ring2 at 33.0° 70 - 140 cm • Ring3 at 36.0° 70 - 140 cm • Performances for different distances • Design • DE = 1.0 % (FWHM) • e = 1.5 % • Option : closest geometry • DE = 1.6 % (FWHM) • e = 2.8 %

  23. FRagment Separator (FRS) Dipole magnets : Br selection 400~1000 MeV/u Multi-wire chambers : Tracking MUSIC : Z ~ 100 MeV/u Fast plastic scintillator : Time of Flight (TOF)

  24. Relativistic Coulomb excitation with the 84Kr primary beam Scattering angle dependence 0.0-0.5 0.5-1.0 1.0-1.5 Preliminary Mainly elastic scattering 1.5-2.0 2.0-2.5 2.5-3.0 Coulomb excitation Nuclear reaction Analysis by T.Saito

  25. Two-step fragmentation 58Ni 700 MeV/u→55Ni 171 MeV/uon Be 0.7 g/cm2 Analysis by T.Saito

  26. Ni Co Fe Mn Cr Ti Ca Ar S Si 54Ni 2+ -> 0+ 54Ni 4+ -> 2+ Two-step fragmentation 58Ni 600 MeV/u→55Ni 171 MeV/uon Be 0.7 g/cm2 CATE dESi Preliminary CATE ECsI

  27. FRagment Separator Dipole magnets : Br selection MUSIC : Z measurement ~ 1 GeV/u Multiwire chambers : Tracking ~ 100 MeV/u Fast plastic scintillator : Time-Of-Flight (TOF)

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