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RISING Project

R are Is otopes In vestigation at G SI. RISING Project. Adam Maj (IFJ PAN Kraków). NEEN meeting in Krakow September 14/15 2004. R are isotopes production : p rojectile fragmentation and fission. 9 Be target exotic nuclei (also neutron deficient)

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RISING Project

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  1. Rare Isotopes Investigation at GSI RISING Project Adam Maj (IFJ PAN Kraków) NEEN meeting in Krakow September 14/15 2004

  2. Rare isotopes production:projectile fragmentation and fission • 9Be target • exotic nuclei (also neutron deficient) • fragments nearly retain the projectile direction and velocity Interaction zone • 208Pb target, heavy beam (238U) • neutron rich nuclei • fragments can be faster than the projectile Coulomb field

  3. RISING@GSI • The Accelerators: • UNILAC(injector) - E<15 AMeV • SIS - E <2 AGeV • Beams: • HI ranging up to 238U • Currents: • 238U - 2* 108 pps • medium mass nuclei- 109 pps • (A~130) In beam g-spectroscopy

  4. Rare isotope selection at FRS(Br-DE-Br technique) fully striped fragments • Transmission : • 20-70 %for fragmentation • < 2 %for fission primary beam 86Kr ~700 AMeV 20m secondary beam 78Ni ~ 100 AMeV production target 9Be magnetic dipoles degrader Br µ bgA/Z DE µ Z2f(b)

  5. PlannedRISING campaigns2003-2006 • Fast beam campaign • Relativistic Coulomb excitations (E2 and E1) • Break-up reactions • Isomeric beams • g-factors of short lived states (transient fields) • Stopped beam campaign • g-factor measurements of long lived isomers • Decay of isomers • ? Slowed down beam campaign

  6. RISING setup for fast beams CATE: Position Sensitive Calorimeter Telescope FRS HECTOR: time spectrum EUROBALL 15 cluster Ge-detectors (each having 7 capsules) Relativistic Coulomb E2 or E1 excitation of projectile HECTOR 8 BaF2 scintillators Break-up Comissioning exp.: Coulomb excitation in 84Kr @ 100 MeV/n (A. Maj et al.)

  7. The design of g-arrays at RISING Target chamber CATE beam Ge Cluster detectors BaF2 HECTOR detectors

  8. 15 clusters at GSI 5 Clusters at 15.90, d = 700mm 5 Clusters at 330, d = 1295mm (700mm to 1400mm) 5 Clusters at 360, d = 1372mm (700mm to 1400mm) For 1% energy resolution eff = 1.52% at 1.3 MeV (66% from first ring) 15 Clusters at 700mm eff = 2.92%, at 1.3 MeV, resolution 1.44%

  9. Subjects to be studied with RISING Nuclear Shapes Shape Coexistence Shape transitions K-isomerism N ≈ Z Nuclei Shell structure pn pairing Isospin symmetry GT and Fermi decay Heavy Nuclei Shell stabilization Shell evolution n-rich Nuclei Shell structure around 132Sn New shell closures at N=32 Soft dipole modes Nucleosynthesis

  10. The international collaboration • CLRC Daresbury • Univ. Keele • Univ. Liverpool • Univ. Manchester • Univ. Paisley • Univ. Surrey • Univ. York • FZ Juelich • FZ Rossendorf • GSI Darmstadt • HMI Berlin • LMU Muenchen • MPI Heidelberg • TU Darmstadt • Univ. Bonn • Univ. Koeln • INFN Genova • INFN Legnaro • INFN/Univ. Napoli • INFN/Univ. Padova • Univ. Camerino • Univ. Firenze • Univ. Milano • Univ. Demokritos • CEA Saclay • CSNSM Orsay • GANIL Caen • IPN Orsay • KTH Stockholm • Univ. Lund • Univ. Uppsala • IFJ Krakow • IPJ Swierk • Univ. Krakow • Univ. Warszawa • Univ. Leuven • NBI Copenhagen • Australian Nat. • Univ., Canberra

  11. RISING Project duration 2003-2006

  12. Application for SPUBM Memorandum of Understanding (2002) „Countries will bid for the running costs in the following proportion” 2004

  13. Experiments performed so far

  14. Two-step Fragmentation • Highest yield when intermediate fragment is 1 or 2 nucleons away from final fragment of interest • Expect to populate a few states near ground state spin (yrast or non-yrast?) • Mirror nuclei produced by “mirrored” intermediate fragments in “mirrored” reactions… Primary target Secondary target 2p 2pn 6p5n Neutron rich 44Sc23 52Mn27 55Co28 53Mn28 58Ni 25 21 27 25 etc. 5×108 s-1 55Ni27 53Ni25 52Co25 44V21 28 27 23 28 Proton rich 2n p2n 5p6n 4×105 s-1 5000s-1 RIB intensity

  15. Nuclei of interest (e.g. 53Ni) produced via two-step fragmentation of 58Ni (RISING exp., M.A. Bentley et al.., October 2003 (on-line spectra)

  16. Evidence of Mirror State Population – G. Hammond, Zakopane2004 • 54Ni recently seen with EUROBALL (A. Gadea et. al.) • States populated by particle alignments • Positive & negative energy differences • More evidence of “J=2 anomaly” 1131 keV 2+ - 0+ 1408 keV 4+ - 2+ 9Be(55Co,p)54Fe A. Gadea et. al. (p.c.) 1227 keV 2+ - 0+ 1392 keV 4+ - 2+ 9Be(55Ni,n)54Ni LNL Annual Report 2003 http://www.lnl.infn.it/~annrep/read_an/2003/contrib_2003/pdfs/A113TTS.pdf

  17. New Shell Structure at N>>Z Relativistic Coulex in N=28-34, N=40-50 Nuclei Preliminary 58Cr 56Cr M.Honma et al, Phys. Rev. C65(2002)061301 E.Caurier et al, Eur.Phys.J. A 15, 145 (2002) A. Bürger, Zakopane 2004

  18. Future improvements:MINIBALL at RISING • MINIBALL-Cluster detector • 3 encapsulated, 6-fold segmented Ge detectors • digital electronics: XIA – DGF cards • pulse shape analysis 8 detectors around the target

  19. Stopped beam campaign: setup for g-factor measurement

  20. GSI, Darmstadt H.-J. Wollersheim A. Banu, T. Beck, F. Becker, P. Bednarczyk, P.Doornenbal, J. Gerl, M. Górska, J. Grębosz, M. Hellström, I.Kojouharov, N. Kurz, R. Lozeva, S. Mandal, S. Muralithar, W.Prokopowicz, N. Saito, T.R. Saito, H. Schaffner, C. Wheldon • IFJ PAN, Kraków A. Maj, J. Styczeń, P. Bednarczyk, J. Grębosz, M. Kmiecik, M. Ziębliński, W. Męczyński, • IF UJ, Kraków R. Kulessa, W. Prokopowicz • UW Warszawa (T. Rząca-Urban, M. Palacz) • IPJ, Świerk (M. Moszyński)

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