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We investigate whether and in what measure scientists tend to diversify theirresearch activity, and if this tendency varies according to their belonging todifferent disciplinary areas. We analyze the nature of research diversificationalong three dimensions: extent of diversification, intensity ofdiversification, and degree of relatedness of topics in which researchersdiversifies. For this purpose we propose three bibliometric indicators, basedon the disciplinary placement of scientific output of individual scientists.The empirical investigation shows that the extent of diversification is lowestfor scientists in Mathematics and highest in Chemistry; intensity ofdiversification is lowest in Earth sciences and highest in Industrial andinformation engineering; and degree of relatedness is lowest in Earth sciencesand highest in Chemistry.

Specialization vs diversification in research activities: the extent, intensity and relatedness of field diversification by individual scientists