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Phys. Rev. Lett. 100, 164801 (2008) [4 pages]

Novel Internal Target for Electron Scattering off Unstable Nuclei

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M. Wakasugi1, T. Emoto1, Y. Furukawa2,*, K. Ishii3, S. Ito1, T. Koseki1,†, K. Kurita3, A. Kuwajima2, T. Masuda3,‡, A. Morikawa3, M. Nakamura1, A. Noda4, T. Ohnishi1, T. Shirai4, T. Suda1, H. Takeda1, T. Tamae2, H. Tongu4, S. Wang1, and Y. Yano1
1RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
2Laboratory of Nuclear Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
3Department of Physics, Rikkyo University, Toshima, Tokyo 171-8501, Japan
4Institute of Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan

Received 9 November 2007; published 22 April 2008

A novel internal target has been developed, which will make electron scattering off short-lived radioactive nuclei possible in an electron storage ring. An “ion trapping” phenomenon in the electron storage ring was successfully utilized for the first time to form the target for electron scattering. Approximately 7×106 stable 133Cs ions were trapped along the electron beam axis for 85 ms at an electron beam current of 80 mA. The collision luminosity between the stored electrons and trapped Cs ions was determined to be 2.4(8)×1025  cm-2 s-1 by measuring elastically scattered electrons.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.164801
DOI:
10.1103/PhysRevLett.100.164801
PACS:
29.25.Pj, 25.30.Bf, 29.20.db

*Present address: Institute for Semiconductor Technology, ULVAC Co., Ltd., Susono, Shizuoka 410-1231, Japan.

†Present address: Accelerator Laboratory, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan.

‡Present address: Department of Complexity Science and Engineering, University of Tokyo, Kashiwa, Chiba 277-8583, Japan.

 
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