Possibilities with pulsed polarized high density slow positrons

13th International Workshop on Slow Positron Beam Techniques and Applications

Mills, A.P.^1

Department of Physics and Astronomy, University of California Riverside, Riverside, CA 92521, United States^1

关键词: Bose-Einstein condensates;    Cylindrical cavities;    Isotopically enriched;    Long-term storage;    Polarized electrons;    Polarized positrons;    Single-shot measurements;    Slow positron beam;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/505/1/012039/pdf
DOI  :  10.1088/1742-6596/505/1/012039

来源: IOP

【 摘 要 】

A particularly bright and intense polarized slow positron beam could be formed from isotopically enriched79Kr produced at a reactor. After moderation with solid Ne, accumulation, compression, and bunching, this type of positron beam would enable a number of experiments including: (1) Long term storage of a neutral polarized electron-positron plasma in a cold box; (2) Pulsed e+ ACAR with a pulsed magnet to measure Fermi surfaces of paramagnetic metals; (3) Single shot measurements of positron annihilation in laser-imploding plasmas; (4) Study of a spin-polarized positronium gas at a density around that of ordinary air to produce a Ps Bose-Einstein condensate at room temperature; (5) High energy polarized positron channelling experiments to study polarized electron spatial wave functions in ferromagnets; and (6) Study of supersonic free expansion spin polarized BEC Ps jets formed from, for example, 1011m=1 triplet Ps atoms created within an open ended 1 μm diameter cylindrical cavity 100 μm in length.