Discovery of antiproton trapping by long-lived metastable states in liquid helium
Abstract
Delayed annihilation of antiprotons stopped in liquid helium has been observed, revealing that about 3.6% of stopped antiprotons are trapped in long-lived metastable states. No delayed component was found either in liquid nitrogen or in liquid argon. The observed time distribution of delayed annihilation shows fast-decaying components followed by a major part with a decay time constant of 3 μsec.
- Publication:
-
Physical Review Letters
- Pub Date:
- September 1991
- DOI:
- 10.1103/PhysRevLett.67.1246
- Bibcode:
- 1991PhRvL..67.1246I
- Keywords:
-
- 36.10.-k;
- Exotic atoms and molecules