[单选题]
The Q value for a particular reaction is -2.4 M6f ,k36p khnsd k jq2xx;dg0s7eVy/prw0hd 1zh lkcl3+(z c0z+s, and the reaction's threshold energy is 9.60 MeV. What is the ratio of the mass of the incident particle to the mass of the stationary targetr0 sc z 1 lw++hcl3zzdp0/(khy nucleus?