Spin polarization of K37 produced in a single-proton pickup reaction at intermediate energies

Spin polarization of K37 nuclei produced via single proton pickup from a Be9 target by a beam of 150 MeV/nucleon Ar36 has been observed. Positive spin polarization with magnitude (8.5±0.6)% was deduced near the peak of the K37 momentum distribution. The variation of the spin polarization as a function of outgoing K37 momentum is explained by a classical conservation model, as previously applied to describe the induced spin polarization observed for fragments produced in intermediate-energy heavy-ion reactions, with the condition that the picked-up proton has an average momentum equal to the Fermi momentum and is aligned along the incident beam direction