Tables that are frequently deleted

I was wondering if anyone out there had some suggestions on how to deal with this problem.
We have a participants table that stores all the participants in a program.
During an enrollment period we may have several thousand new participants that may choose to enroll in a program.
After enrollment we delete all the participants who haven't enrolled in a program.
Should I create a separate table called new_participants and just truncate it after each enrollment, or should we leave all records in the same table and delete unused records after enrollment?

truncate is an option if performance is becoming a problem and there are a large number of full table scans from the application. Otherwise, this is not requried.

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