Aldo F Craievich, Institute of Physics, University of São Paulo, São Paulo-SP, Brazil 
Hannes Fischer, Jacto Máquinas Agrícolas SA, Pompéia-SP, Brazil (2010)

Abstract: We present and discuss here numerical information derived from a systematic searching of scientific papers related to SAXS and SANS published in indexed journals - from 1945 until nowadays - recorded by the Web of Science Data Bank (WoS).  We have detected interesting features regard ing the time dependence of the number of papers/year, N(t), indicating the existence of  three well-defined periods of historical evolution with rather welldefined boundaries.  All three periods exhibit a positive and approximately linear variation of N(t) but, at the two transitions between periods, the rate of growth exhibits clear and strong increases. Differences of the historical evolutions in the numbers of papers/year related to SAXS and to SANS were established. The different behaviours regarding the numbers of papers/year related to SAXS and to SANS and the existence of three different and well defined periods for N(t) can be qualitatively understood as a consequence of the progressive and increasing availability along the  last three decades of very  brilliant synchrotrons, last generation commercial X-ray sources, new neutron facilities, powerful  computers and novel theoretical approaches for SAS data analysis. The rates of growth in the number of papers/year published by authors from a set of different countries are approximately constant along the last two decades. For other countries we have detected a slowing down effect in the number of papers/year while a clear acceleration could be noticed for the production of SAS papers by authors from several emerging countries. These opposite trends compensate in such a way that the number of SAS (SAXS+SAXS) articles published per year all around the world maintained a vigorous linear growth - during more than 20 years - at a constant rate of 60 papers/year, without any indication of  eventual saturation. The observed distribution of articles among different journals indicates that a very high fraction of the volume of SAS research is focused to the structure of soft matter. 

Citation: Aldo F Craievich and Hannes Fischer 2010 J. Phys.: Conf. Ser. 247 012003
doi: 10.1088/1742-6596/247/1/012003