PROTON POLARIZATION FROM PI ABSORPTION IN HE-4
J ACLANDER, S MAYTALBECK, 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
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.