Observations of cold antihydrogen
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- 作者：Tan ; J.N. ; Bowden ; N.S. ; Gabrielse ; G. ; Oxley ; P. ; Speck ; A. ; Storry ; C.H. ; Wessels ; M. ; Grzonka ; D. ; et. al.
- 关键词：36.10.&minus ; k ; 52.20.&minus ; j ; Antihydrogen ; Nested Penning trap ; Positron cooling ; Recombination in cold plasma ; Rydberg atom ; Field ionization
- 刊名：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
- 出版年：2004
- 出版时间：January, 2004
- 年：2004
- 卷：214
- 期：Complete
- 页码：22-30
- 全文大小：405 K
文摘
ATRAP’s e+ cooling of in a nested Penning trap has led to reports of cold produced during such cooling by the ATHENA and ATRAP collaborations. To observe , ATHENA uses coincident annihilation detection and ATRAP uses field ionization followed by storage. Advantages of ATRAP’s field ionization method include the complete absence of any background events, and the first way to measure which states are produced. ATRAP enhances the production rate by driving many cycles of e+ cooling in the nested trap, with more counted in an hour than the sum of all the other antimatter atoms ever reported. The number of counted per incident high energy is also higher than ever observed. The first measured distribution of states is made using a pre-ionizing electric field between separated production and detection regions. The high rate and the high Rydberg states suggest that the is formed via three-body recombination, as expected.