π- has spin 0 and negative intrinsic parity. In a reaction a deuteron in its ground state (J = 1, parity is +1 ) captures a π- in p-wave to produce a pair of neutrons (intrinsic parity is +1). The neutrons will be produced in a state with
1
l = 1, S = 0
2
l = 0, s = 1
3
l = 1, S = 1
4
l = 0, s = 0