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Sigurd Hofmann GSI Darmstadt and Goethe-University Frankfurt

International School of Nuclear Physics, 30th Course. Heavy-Ion Collisions from the Coulomb Barrier to the Quark-Gluon Plasma. Study of SHE at the GSI – SHIP. Sigurd Hofmann GSI Darmstadt and Goethe-University Frankfurt. September 16-24, 2008, Erice, Sicily.

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Sigurd Hofmann GSI Darmstadt and Goethe-University Frankfurt

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  1. International School of Nuclear Physics, 30th Course Heavy-Ion Collisions from the Coulomb Barrier to the Quark-Gluon Plasma Study of SHE at the GSI – SHIP Sigurd Hofmann GSI Darmstadt and Goethe-University Frankfurt September 16-24, 2008, Erice, Sicily

  2. Calculated half-lives: 108 years – 1 ns spherical nuclei deformed nuclei deformed nuclei spherical nuclei SHE trans-actinides actinides proton number stabile elements neutron number

  3. Predictions of the macroscopic-microscopic model

  4. Expected half-lives of SHE and research goals even- even • Location of closed shells: • Proton shell: • 114, 120 or 126 / 114 – 126 ? • Neutron shell: • 172 or 184 ? • Reaction mechanism: • Cross-sections • Excitation functions • Cross bombardments • Mass asymmetry • Fusion and transfer • Nuclear structure: • Lifetimes • Decay modes • Isomers even- odd 6 3 0

  5. The "UNIversal Linear ACcelerator" UNILAC Rc 1505; 2f18

  6. Velocity separator SHIP SHIP: Separation time: 1 – 2 μs Transmission: 20 – 50 % Background: 10 – 50 Hz Det. E. resolution: 18 – 25 keV Det. Pos. resolution: 150 μm Dead time: 3 – 25 μs Mastertitelformat bearbeiten

  7. Detector system Time: F3–F1 1 s Sistop,box –F1,2,3 4s Sistop – Sibox 5 s Sistop,box – Ge1,2,3,4 5 s Dead time: 3 and 25 s Energy: Estop: Ebox: 0.2 – 16; 0.2 – 16 MeV 5.0 – 320; 2.5 – 160 MeV Eveto: 0.4 – 16 MeV Ge: 30 – 2000 keV 0.1–8.0 MeV Position: Stop x = 0 – 80 mm / 5 mm ytop,bottom = 0 – 35 mm / 0.2 mm Box: 28 Segments Fusions- Produkte

  8. Energy versus time-of-flight plots, Δt (ER-sf) = 1000 s 252No E / MeV 206Pb 48Ca 48Ca + 206PbS => 254No* 238U 48Ca + 238U=> 286112* –TOF / channel

  9. Longest decay chain of 277112 253Fm 257No 265106 261104 273110 269108 11.45 MeV 280 s 277112 11.08 MeV 110 s 9.23 MeV 19.7 s yER = 17.9 mm 4.60 MeV (escape) 7.4 s 8.52 MeV 4.7 s Known nuclei 8.34 MeV 15.0 s 277112 CN y = 150 m (FWHM) y = 35 mm d = 300 m

  10. First decay chain of element 112 Experiment, GSI-SHIP, 9. February 1996, 22:36 h Theory, P. Möller, 1995: Ground-state shell correction energy

  11. Reaction mechanism 2n • Excitation functions 1n 3n 50Ti, 54Cr, 58Fe, 64Ni, 70Zn + 208Pb

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