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R are IS otope IN vestigation at G SI Status of the relativistic beam campaign

R are IS otope IN vestigation at G SI Status of the relativistic beam campaign. Introduction Fast beam physics program Experimental methods Status and perspectives. P. Reiter for the RISING collaboration Workshop: RISING with stopped beams University of Surrey, March 29 – 30, 2004.

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R are IS otope IN vestigation at G SI Status of the relativistic beam campaign

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  1. Rare ISotope INvestigation at GSI Status of the relativistic beam campaign Introduction Fast beam physics program Experimental methods Status and perspectives P. Reiter for the RISING collaboration Workshop: RISING with stopped beams University of Surrey, March 29 – 30, 2004

  2. RISING introduction • RISING physics with stopped beams, March 29/30, 2004 Surrey • GSI Program Advisory Committee January26/27, 2004 Darmstadt 4 RISING proposals • Commissioning & first experiments August-October2003 • GSI Program Advisory Committee June20/21, 2002 Darmstadt 12 RISING proposals • Physics with RISING at GSI, March 22, 2002 Orsay • RISING physics with relativistic HI-beams, April 6, 2001 Darmstadt • RISING physics with stopped beams, March 9, 2001 Göttingen • RISING physics with slowed-down beams, April 2/3, 2001 Legnaro • Physics with EUROBALL detectors at GSI, • November 23/24, 2000 Darmstadt

  3. High resolution g-spectroscopy at the FRS • fragmentation and fission of primary beams • projectile energy 400 – 750 MeV/u • primary targets: Be or Pb FRS • Dipoles: • Identification of fragmentation product (A,Z) • g-spectroscopy at secondary target • Channel selection after target (A,Z) • Tracking before/after secondary target RISING

  4. RISING approved experiments

  5. Physics program 104-112Sn 134Te 132Sn 53Ni 68Ni 66Fe Shell structure of unstable magic- and double magic nuclei 32,34Mg

  6. Isospin symmetry at N=Z 45Cr, 49Fe,53Ni 69Br 53Ni 55Ni f7/2-shell 55Co 53Co 53Fe 49Fe 50Fe 50Mn 45Cr 50Cr 46Cr 46V 45V 42Ti 45Ti 43Ti 46Ti 41Sc 42Sc 43Sc 45Sc ? 42Ca 41Ca T= 1/2 T= 1 T=3/2no excited states

  7. Shapes and shape coexistence 136Nd 185,186,187Pb 3+ 2+ potential energy surface for 186Pb

  8. g-decay of the GDR in the Exotic Nucleus 68Ni 48Ni 58Ni • Giant Dipole Resonance (GDR) : • basic collective excitation modes • effective NN interactions • Evolution of GDR strength in exotic nuclei : • Fine structures • GDR strength at lower energy • astrophysical implications • RISING: relativistic Coulomb excitation • (virtual photon scattering) • -decay branch: Gg/Gtot ~ 10-3 - 10-2 68Ni 78Ni Relativistic RPA, Vretenar et al.

  9. experimental methods • Established methods: • Coulomb excitation • - first 2+ states => B(E2) • - giant dipole resonance • (virtual photonabsorption) • Secondary fragmentation • - excited states at higher spins and excitation energy

  10. RISING new developments • Coulomb excitation • Low lying states B(E1),B(E2, 0+gs -> 2+1,2,3) • 2+ states + angular correlation • 2+ states + g-factor

  11. g-decay of the GDR in the Exotic Nucleus 68Ni g-decay of the GDR in the Exotic Nucleus 68Ni Excited via Coulomb Excitation HECTOR reaction 68Ni (400 MeV/A) + natPb (2 g/cm2) BaF2 for the whole GDR strength function Ge cluster for the Pygmy part 6 BaF2 detectors efficiency at high energies:

  12. knock-out reactions Spectroscopic factors: g-ray intensity ofexcited states in the A-1 fragment. No l-value of ejected nucleon, missing momentum distribution. g-decay of excited states Recoil momentum 132Sn

  13. Shape evolution in n-rich Mg nuclei 32Mg , b2 32Mg , b3 Primary beam : 48Ca Secondary beam : 38Si g2 g3 g1 0.7 mm 2.1 mm SIS FRS S4 Secondary fragmentation & lifetime measurement 32Mg , b1 38Si 100 MeV/u Eg1 targets: Au : 3 x 0.3 g/cm2 Eg2 Eg3 Eg

  14. RISING timetable 2003 22.4.- 16.5.2003Cluster shipment 22.4.- 4.8.2003annealing, assembly, testing and mounting 16.6.- 20.6.2003assembly of support structure 14.7.- 5.8.2003VXI-MBS tests (S4)

  15. short term outlook • 2004 • Block 2/2004:    March 31 - May 21(Therapy:          March 31 - April 30) • RISING: May 1 – 18 • - E1 strength in 68Ni • RISING & HECTOR • - Shell structure in N>>Z nuclei • Block 3/2004:    July 14 - October 7(Therapy:          July 14  - August 13) • Block 4/2004:    Oct. 27 – Dec. 16(Therapy:          Oct. 27 – Nov. 26) • RISING: Nov. 29 – Dec. 12 • RISING & MINIBALL • 2005 • Winter: RISING & MINIBALL • SIS beam time is shared between: • HADES • FRS & ESR mass measurements • RISING RISING & MINIBALL Increased g-efficiency: 4 - 10 %

  16. Summary • RISING fast beam campaign • started data taking on time in 2003 • First experiments • Coulomb excitation of stable 84Kr (commissioning) • Coulomb excitation of fragments: 56Cr,108Sn,112Sn • Spectroscopy after secondary fragmentation of 55Ni • see talks: N. Hashimoto, M. Gorska, A. Bürger, M. Bentley

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