What is a Bragg Point in the Context of BEC of Triplet States?

assyrian_77
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Can someone please explain to me what a Bragg point is? I can't find any information anywhere as to what this is. I'm going through an article about BEC of triplet states and it mentions Bragg point. For some reason, I have not encountered this before and would appreciate any help. Thanks.
 
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I have the same doubt, but unable to find... now i thinks, it as the point where bragg reflection takesplace
 
same confusion here
 

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