Interdiction Torch

The Interdiction Torch has the push-force effect as an activated Rending Gale, with a 5-block radius. All mobs that try to get in within the radius are repelled, this also works for projectiles fired at you, as they are deflected. Generally, a single torch can protect a player when placed on the ground, and a torch or two in a mining tunnel will guarantee virtually anything to be barred from entry.

In addition, putting an interdiction torch in an alchemical chest will cause it to produce a light level of 15 and repel mobs. The fact that it emits light means that it has ability to act as a glowstone block above a collector, giving a buffer to remove items from and additionally powering the collector.