Proton polarization from π+ absorption in 4He

J. Aclander*, S. MayTal-Beck, A. Altman, D. Ashery, H. Hahn, M. A. Moinester, A. Rahav, A. Feltham, G. Jones, M. Pavan, M. Sevior, D. Hutcheon, D. Ottewell, G. R. Smith, J. A. Niskanen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The polarization of protons resulting from π+ absorption in 4He was measured at bombarding energies of 120 MeV and 250 MeV. Events arising from absorption in a quasi-deuteron were analysed by using kinematical constraints. The apparatus was tested by measuring the polarization of protons resulting from π+d→→pp. Differences observed between polarization measured for pion absorption in the deuteron and in quasi-deuterons inside 3He and 4He suggest that the density of the absorbing nucleon pair affects this observable. There is however a large discrepancy between the experimental results and theoretical predictions.

Original languageEnglish
Pages (from-to)19-23
Number of pages5
JournalPhysics Letters B
Issue number1-2
StatePublished - 4 Feb 1993


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