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Title: Antihydrogen production and precision experiments

The study of CPT invariance with the highest achievable precision in all particle sectors is of fundamental importance for physics. Equally important is the question of the gravitational acceleration of antimatter. In recent years, impressive progress has been achieved in capturing antiprotons in specially designed Penning traps, in cooling them to energies of a few milli-electron volts, and in storing them for hours in a small volume of space. Positrons have been accumulated in large numbers in similar traps, and low energy positron or positronium beams have been generated. Finally, steady progress has been made in trapping and cooling neutral atoms. Thus the ingredients to form antihydrogen at rest are at hand. Once antihydrogen atoms have been captured at low energy, spectroscopic methods can be applied to interrogate their atomic structure with extremely high precision and compare it to its normal matter counterpart, the hydrogen atom. Especially the 1S-2S transition, with a lifetime of the excited state of 122 msec and thereby a natural linewidth of 5 parts in 10{sup 16}, offers in principle the possibility to directly compare matter and antimatter properties at a level of 1 part in 10{sup 16}.
Authors:
; ;  [1]
  1. and others
Publication Date:
OSTI Identifier:
442156
Report Number(s):
LA-UR-96-4788; CONF-9605253-1
ON: DE97002374; TRN: 97:005073
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: 3. Biellian conference on low energy antiproton physics, Rome (Italy), 19-25 May 1996; Other Information: PBD: 1996
Research Org:
Los Alamos National Lab., NM (United States)
Sponsoring Org:
USDOE Assistant Secretary for Human Resources and Administration, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; ANTIMATTER; GRAVITATION; ANTIPROTONS; PARTICLE PRODUCTION; CPT THEOREM; HYDROGEN; TRAPPING