Analyzing-power measurement in pn-pp(1S0): Pion absorption by quark clusters?

C. Ponting, D. A. Hutcheon, M. A. Moinester, P. L. Walden, D. R. Gill, R. R. Johnson, F. Duncan, G. Sheffer, P. Weber, V. Sossi, A. Feltham, M. Hanna, R. Olszewski, M. Pavan, F. M. Rozon, M. Sevior, D. Ashery, R. P. Trelle, H. Hahn, B. Mayer

Research output: Contribution to journalArticlepeer-review


We have measured analyzing powers in d(p,-pp)p at a beam energy of 400 MeV and laboratory pion detector angles of 35°and 43°. The - and two of the outgoing protons were detected in coincidence in a geometry which selected the quasifree two-body reaction pn-pp(1S0). The analyzing-power data combined with He3(-,pn)n differential cross sections allow determination of the transition amplitudes. The results indicate a significant contribution from a very short-range part of the nucleon-nucleon interaction.

Original languageEnglish
Pages (from-to)1792-1795
Number of pages4
JournalPhysical Review Letters
Issue number17
StatePublished - 1989


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