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JJAP Conference Proceedings

JJAP Conf. Proc. 7, 011001 (2018) doi:10.7567/JJAPCP.7.011001

Study on positronium Bose–Einstein condensation

Akira Ishida1, Kenji Shu1, Tomoyuki Murayoshi1, Xing Fan1, Toshio Namba1, Shoji Asai1, Kosuke Yoshioka2, Makoto Kuwata-Gonokami1, Nagayasu Oshima3, Brian E. O’Rourke3, Ryoichi Suzuki3

  1. 1Department of Physics, Graduate School of Science, and International Center for Elementary Particle Physics (ICEPP), the University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
  2. 2Photon Science Center (PSC), Graduate School of Engineering, the University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
  3. 3National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
  • Received September 25, 2017
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Abstract

Realization of the Bose–Einstein condensation (BEC) of positronium is a long-standing challenge of positron physics. Since the positron is the antimatter of the electron, the positronium is the antimatter of itself, and its gravity interaction is a sum of matter and antimatter components. In this sense, it can be used to study antimatter gravity. It can also be used as a source of a γ-ray laser. We have proposed a new method to realize a positronium BEC: a combination of thermalization in a cold silica target and laser cooling using 1S-2P transitions. We have started some basic studies based on our new idea. Here we report a preliminary result of our positronium thermalization measurement in cryogenic environment and development status of a new laser system for positronium cooling.

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