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RESEARCH PRODUCT

Future Aspects of Positron Spectroscopy

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description

In the first week of this conference experimentalists made us familiar with the features of the positron peaks observed in the collision of very heavy ions with atoms. We learned that these peaks are not understandable in terms of known positron production mechanisms like monoenergetic pair decay of excited nuclear levels or the proposed spontaneous positron production in superheavy atoms. In addition, theorists told us that, at present, also the interpretation that the positron peak structures originate from the decay of a previously not observed neutral particle is in contradiction to well-known experimental facts. Some of you may have, in addition, become confused by the results of the three experimental groups which, at first glance, sometimes may look contradictory. Therefore, I will try to summarize and to discuss in this contribution the most important experimental observations of the EPOS, ORANGE and TORI groups and to formulate, using this as a starting point, the open questions for future experimental investigations.