in nuclear physics, process in which a projectile nucleus grazes a target nucleus such that the target nucleus absorbs part of the projectile. The remainder of the projectile continues past the target. An example is the (d, p) stripping reaction involving an aluminum-27 nucleus and a deuteron. The deuteron (consisting of one proton and one neutron) grazes the aluminum nucleus, which captures the neutron to become aluminum-28, and the proton continues on with a velocity comparable to that of the incident deuteron.