A novel trap for electron scattering off short-lived exotic nuclei

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Presentation transcript:

A novel trap for electron scattering off short-lived exotic nuclei Groundbreaking experiments now in sight : the structure studies of short-lived nuclei by electron scattering Toshimi Suda RI Beam Factory RIKEN Nishina Center JAPAN NIM A532 (2004) 216 PRL 100 (2008) 164801.

RIKEN RI Beam Factory (RI : Radioactive Isotope) in operation since 2007 Nuclear Chart Projectile Fragmentation In-flight U fission & P.F. protons neutrons primary beam : 350 MeV/u p ~ U : 1 pμA as of today 48Ca : 0.2 pμA 238U : 0.35 pnA

Required luminosity for electron elastic scattering key : luminosity ex. elastic scattering for Ni, Sn isotopes L = 1026 /cm2/s Ee = 200 MeV 1 week Δθ= 1 deg. Δφ= 90 deg. Ni Sn better than a few % accuracy of diff. radius and diffuseness

What is SCRIT (Self-Confining RI Target) ? “Ion trapping” phenomena observed at electron rings ionized residual gases by electrons are trapped by electron beam itself. the trapped ions kick out electrons ---> shorter beam lifetime electron scattering !! SCRIT technique trap the target nuclei externally injected on (high energy) electron beam. transverse : ion trapping longitudinal : mirror potential e-beam precise position control -> higher luminosity fast ion manipulation -> short-lived nuclei

installed at KSR, Kyoto Univ. JAPAN SCRIT prototype installed at KSR, Kyoto Univ. JAPAN 26 cm 30º 40º 60º Ion Source Analyzer SCRIT chamber Electron detector e-beam W-wire Recoil

elastic scattering and achieved luminosity Y = L*dσ/dΩ *ΔΩ*T Luminosity (/cm2/s) 2007. April 2007. Dec. 2008. May Ie~80mA finer tuning of the ion beams DREPHA L=1.2 x 1026 /cm2/s @ Ie = 80 mA (Ne=5x1017 /s) target thickness = L/Ne = 2.4 x 108 /cm2 Ions trapped on the electron beam　~106