Development of a porous silica cavity for laser excitation of confined positronium

DOI Web Site 29 References
  • Shu Kenji
    Department of Physics, Graduate School of Science, and International Center for Elementary Particle Physics (ICEPP), The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
  • Yamada Kyohei
    Department of Physics, Graduate School of Science, and International Center for Elementary Particle Physics (ICEPP), The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
  • Hashidate Kaori
    Department of Physics, Graduate School of Science, and International Center for Elementary Particle Physics (ICEPP), The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
  • Ishida Akira
    Department of Physics, Graduate School of Science, and International Center for Elementary Particle Physics (ICEPP), The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
  • Namba Toshio
    Department of Physics, Graduate School of Science, and International Center for Elementary Particle Physics (ICEPP), The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
  • Asai Shoji
    Department of Physics, Graduate School of Science, and International Center for Elementary Particle Physics (ICEPP), The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
  • Kuwata-Gonokami Makoto
    Department of Physics, Graduate School of Science, and International Center for Elementary Particle Physics (ICEPP), The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
  • Tajima Yohei
    Photon Science Center (PSC), Graduate School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
  • Chae Eunmi
    Photon Science Center (PSC), Graduate School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
  • Yoshioka Kosuke
    Photon Science Center (PSC), Graduate School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
  • Oshima Nagayasu
    National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
  • O’Rourke Brian E.
    National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
  • Michishio Koji
    National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
  • Ito Kenji
    National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
  • Kumagai Kazuhiro
    National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
  • Suzuki Ryoichi
    National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
  • Fujino Shigeru
    Global Innovation Center (GIC), Kyushu University, Kasuga, Fukuoka 816-8580, Japan
  • Hyodo Toshio
    Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
  • Mochizuki Izumi
    Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
  • Wada Ken
    National Institutes for Quantum and Radiological Science and Technology, Takasaki, Gunma 370-1292, Japan
  • Kai Takeshi
    Research Group for Radiation Transport and Analysis, Environment and Radiation Sciences Division, Nuclear Science and Engineering Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan

Description

<p>Laser cooling of positronium (Ps) is an important technique to advance the frontier of science by, for instance, realizing the first Bose-Einstein condensation of antimatters. It was proposed that performing laser cooling on Ps trapped in a cryogenic porous material would be more efficient, but a recent study (Cooper, et al., Phys. Rev. B 97, 205302 (2018)) reported that Ps in the excited (2P) state inside nano pores of silica had a large decay rate into γ-rays, and the resonant spectrum of the transition was significantly broadened, both of which are critically problematic for the proposed cooling scheme. A possible cause of these unexplained results was proposed to be residual impurities which trapped Ps in the vicinity of the pore surface and then enhanced interactions between Ps and the material. This work reports fabrication and inspection of a new porous silica cavity without such impurities, and construction of an experimental system to induce the Lyman-α transition of Ps trapped in pores of the cavity.</p>

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