  The purpose of the present paper is to clarify, as far as it is possible, the
overall picture of experimental results in the field of non-conventional
phenomena in nuclear matter published in scientific literature, accumulated in
the last decades and still missing a widely accepted interpretation. While
completeness of the collection of the experiments is not among the aims of the
effort, focus is put on adopting a more comprehensive and integral approach
through the analysis of the different experimental layouts and the different
results, searching for common features and analogous factual outcomes in order
to obtain a consistent reading of a lot of experimental evidences that appear,
until now, lacking a classification in a logic catalogue which might be
compared to a sort of building and not to a collection of single stones.
Particular attention is put on the issue of reproducibility of experiments and
on the reasons why such a limitation is a frequent characteristic of many
experimental activities reported in published papers. This approach is
innovative as compared with those already available in the scientific
literature. In a synoptical table a comprehensive classification is given of
the twenty experiments examined in terms of type of evidences that are
ascertained by the experimenters in their published papers but are unexpected
according to well established physical theories. Examples of such unexpected
evidences (named also non-conventional or weird) are: excess heat generation,
isotope production, reduction of radioactivity levels, and production of
neutrons or alpha particles.
