Discovery of antiproton trapping by long-lived metastable states in liquid helium
M. Iwasaki(The University of Tokyo), Seitaro Nakamura(The University of Tokyo), K. Shigaki(Tokyo University of Science), Y. Shimizu(The University of Tokyo), H. Tamura(Tokyo University of Science), Takashi Ishikawa(Tokyo University of Science), R. Hayano(The University of Tokyo), E. Takada(Tokyo University of Science), E. Widmann(The University of Tokyo), H. Outa(The University of Tokyo), M. Aoki(The University of Tokyo), P. Kitching(The University of Tokyo), Y. Yamazaki(The University of Tokyo)
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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 \ensuremath{\mu}sec.
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