Temporary disable physics from CCSprite - ios

I'm currently discovering Cocos2D in combination with SpriteBuilder and I'm making stuff bounce around.
It's quite fun :)
What I'm trying to figure out is the following :
- On SpriteBuilder, I create a CCSprite, and I enable physics for this one.
- I can invoke it in XCode, and do whatever I want with it. Plus, the sprite is reacting accordingly to the physics settings applied to it. Great.
Now, what I would like to do is to disable the physics from this sprite in the code. I don't find a method in the Cocos2D API that would do the trick.
Can you help me out ?
Thank you for your time and help ;)

I write the correct answer then:
sprite.physicsBody.sensor = TRUE;

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