A Laser-Cooled Positron Plasma
作者： B. M. Jelenković , J. J. Bollinger , A. B. Newbury , T. B. Mitchell , W. M. Itano
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摘要: We present results on trapping and cooling of positrons in a Penning trap. Positrons from 2 mCi 22 Na source travel along the axis 6 T magnet through trap after which they strike Cu reflection moderator crystal. Up to few thousand are trapped lose energy Coulomb collisions (sympathetic cooling) with laser-cooled 9 Be +. By imaging + laser-induced fluorescence, we observe centrifugal separation Be+ ions positrons, coalescing into column axis. This indicates have same rotation frequency comparable density (4 × 10 cm−3) as ions, places an upper limit approximately 5 K positron temperature motion parallel magnetic field. estimate number volume this annihilation radiation when ejected The measured lifetime is > 8 days our room vacuum −8 Pa.
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