It occurred to me that this kind of thing could be simply called acta when it comes with the name of the university.
For example, for the University of Jyväskylä we could have Acta Granivicensia or Acta Universitatis Granivicensis.
(Or you can replace Granivicensis with Jyväskyläensis.)
The word acta won't work alone and isn't a good overall name for the concept, but I think this word communicates the type of publication sufficiently well.
For a standalone word that could be used for this kind of publication irrespective of the institution, Tom Cotton's suggestion is excellent.
I should remark that acta is also used for scientific journals.
One of the highest-ranking ones in mathematics is Acta Mathematica.