Observation of pp'20 at rest: Evidence concerning s-state annihilation

S. Devons, T. Kozlowski, P. Nemethy, S. Shapiro, N. Horwitz, T. Kalogeropoulos, J. Skelly, R. Smith, H. Uto

    Research output: Contribution to journalArticlepeer-review


    We have identified the annihilation mode pp'20 for antiprotons stopping in liquid hydrogen at a rate which is 0.15 (±20%) times that reported for pp'. This indicates that about 40% of all annihilations into 2 take place from odd-orbital atomic pp states, in contrast to the usual assumption that annihilation from the s state predominates.

    Original languageEnglish (US)
    Pages (from-to)1614-1617
    Number of pages4
    JournalPhysical Review Letters
    Issue number23
    StatePublished - 1971

    ASJC Scopus subject areas

    • General Physics and Astronomy


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