Journal article
Proton polarization from π absorption in 4He
J Aclander, S MayTal-Beck, A Altman, D Ashery, H Hahn, MA Moinester, A Rahav, A Feltham, G Jones, M Pavan, M Sevior, D Hutcheon, D Ottewell, GR Smith, JA Niskanen
Physics Letters B | ELSEVIER SCIENCE BV | Published : 1993
Abstract
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. © 1993.