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Gas-filled separator for nuclear structure experiments at ATLAS

Gas-filled separator for nuclear structure experiments at ATLAS. Darek Seweryniak, ANL. Physics. HK distributions in heavy nuclei (GS) In-beam spectroscopy of heavy nuclei (GS) Isomers and decays of heavy nuclei (focal plane) Super-heavy searches (focal plane)

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Gas-filled separator for nuclear structure experiments at ATLAS

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  1. Gas-filled separatorfor nuclear structure experiments at ATLAS Darek Seweryniak, ANL

  2. Physics • HK distributions in heavy nuclei (GS) • In-beam spectroscopy of heavy nuclei (GS) • Isomers and decays of heavy nuclei (focal plane) • Super-heavy searches (focal plane) • Fast activities in proton-rich nuclei • Gas-cell and traps • …

  3. Principle of Operation vacuum gas Bri = p/qi Br = p/qave qave ~ (v/v0) Z1/3 Br~ 0.0227 A/Z1/3 [Tm]

  4. M/Q measurement physical separation good beam suppression high efficiency short flight path Vacuum vs Gas-Filled • no mass resolution • no separation • poor beam suppression • low efficiency • long flight path Truly complementary devices!

  5. Existing Gas-Filled Separators • RITU - Jyvaaskylaa • BGS – Berkeley • SASSYER - Yale • GFRS - Dubna • GARIS – RIKEN • TASCA - GSI

  6. Parameters of theExisting Gas-Filled Separators separator configuration W [msr] Brmax [Tm] L [m] gas RITU QvDQhQv 10 2.2 4.7 He BGS QvDhD 45 2.5 4.7 He SASSYER DvQhDv 5 2.2 2.4 He Dubna GFRS DQhQv 10 3.1 4.3 H2 TASCA DQhQv 13 2.4 3.5 He

  7. Important design parameters • Solid angle • Scattered beam suppression • Suppression of transfer products • Manageable focal plane size • State-of-the-art implantation station – already available • Efficient coupling to a 4p Ge array (movable)

  8. RITU

  9. Where?

  10. Thank you!

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