EMIL NADJAKOV (1929-1996) was the first leader of the nuclear reactions group at INRNE, academician of the Bulgarian Academy of Sciences, physicist - theorist and experimentalist, doctor of sciences (1979), professor at the Department of Physics of the University of Sofia (1980).
Emil Nadjakov obtained his first experience in nuclear physics during his two-year stay at the University of Goteborg, Sweden. His international relationships developed very quickly. They were expressed in a large number of visits in many worldwide known centers for nuclear research in Europe and participation in different International conferences (Europe, Canada, USA). In addition, he worked for many years as an expert of the IAEA for Bulgaria.
The connections of E. Nadjakov with the Joint Institute of Nuclear Physics (Dubna, Russia) played a very special and important role in his scientific activity. During many years - beginning soon after JINR was founded - Emil Nadjakov had very fruitful collaboration with the Laboratory of Nuclear Reactions and the Laboratory of Theoretical Physics. Twice he was awarded the first JINR Prize for scientific research and in 1982 was elected a deputy-director of the Flerov Laboratory of Nuclear Reactions (1982-1986).
Academician Emil Nadjakov was an exceptional combination of highly-qualified theorist and experimentalist. His name in both nuclear research areas was well-known and frequently referred to. His basic scientific contributions are published in more than 150 papers, predominantly in distinguished nuclear physics journals. Briefly, the directions of his physics research were the following:
- Experimental nuclear physics:
- development of methods for production and spectroscopy of new nuclei
- in-beam spectroscopy of excited states
The main content of the second field was the investigation of high-spin states. The study of nuclear reaction mechanisms, in particular those related to the yrast line feeding, was also an essential part of his experimental interests. In the last decade of his life, the experimental efforts of E. Nadjakov moved to the application of laser spectroscopy for nuclear structure study (nuclear moments, deformations, changes in the mean square charge radii).
- Theoretical nuclear physics:
- development of models for unified treatment of collective motion in nuclei treated as many-body systems
- unified microscopic description of rotation-vibrational coupling effects
- nuclear symmetry models as interacting bosons, interacting fermions and interacting spinors
- particle and subparticle models
- quark-nuclear-plasma model (boson-fermions super symmetry with effective subparticle fermion-boson exchange)
- models of a new type of four-particle interaction
Professor Nadjakov was an outstanding lecturer, whose lectures attracted great interest of many generations of students during his nearly 40 years activity as university teacher. He created two excellent physics courses at the Faculty of Physics of the University: "Physics of electrical and optical phenomena" (general physics) and "Physics of atomic nuclei and elementary particles" (theory). Both of them are still actually taught as at the moment of their creation.