[en] Full text: This Annual Report summarizes the research activities of the Nuclear Physics Division in years 2002 and 2003. As in previous years the scientific reports are grouped in two sections: - Reaction Mechanism and Nuclear Structure; - Experimental Methods and Instrumentation. The present research program of our Division includes ''in-house'' activities concentrated on experiments with beams from the Warsaw Cyclotron of the Heavy Ion Laboratory as well as involvement in research at large accelerator facilities around the world. Most of the work described throughout this report was carried out as joint efforts of various international collaborations. During the last two years we continued our participation in the FOPI, TAPS and WASA-PROMICE international collaborations. We are strongly involved in the FOPI project. The analysis of ''event-by-event'' fluctuations in nuclear collisions has been the subject of our interest for quite some time. Recently results of an analysis of Au + Au collisions were compared with predictions of the IQMD model. The dependence of the model simulation on various values of the nucleon-nucleon interaction cross sections is presented in this report. Two-photon interferometry experiment for the Ta + Au system at 40 A MeV was repeated by the Taps collaboration with the aim to significantly improve the statistics. The obtained two-photon correlation function shows no evidence of any fluctuating structure, suggested by results of the previous experiment. This result rules out the possibility of a simple double-source scenario of photon emission. The neutral pion angular distribution in 95 A MeV Ar induced reactions on several targets were reanalyzed. Namely, it was found that the presence of mixed electromagnetic and hadronic clusters has to be properly taken into account in order to obtain final angular distributions of subthreshold neutral pions. A new type of an analysis of fusion excitation functions and fusion-barrier distributions was proposed. About 50 precisely measured fusion excitation functions were perfectly reproduced within a phenomenological model, and systematics of the model parameters were obtained allowing to predict not yet measured fusion- or capture excitation functions. This result is important for better planning future experiments on synthesis of superheavy elements. During the last year, we continued our study of high-energy γ-ray emission in heavy-ion reactions in the energy range of 5-11 MeV/u. The purpose of this work was to investigate properties of hot, fast rotating compound nuclei. In our resent experiments using the beam of the Warsaw Cyclotron and the modified JANOSIK set-up, isospin mixing in ³²S at high excitation energies was studied. The degree of the isospin mixing was extracted from the statistical decay of the giant dipole resonance. It was shown that at 58.3 MeV excitation energy, the isospin mixing is small, in agreement with previously published data. Recent theoretical and experimental works have attracted attention to the problem of chirality in atomic nuclei with odd number of protons and neutrons. These investigations are in a very preliminary stage and up to now there was no information concerning the lifetimes in chiral bands. Using the beam of the Warsaw Cyclotron and the OSIRIS experimental set-up, lifetimes of supposedly chiral bands in ¹³² La were measured for the first time. These interesting results, compared with theoretical calculations, are presented in this Report. High spin states in deformed nuclei in the region of atomic mass number around A ≅ 170 have also been studied.The band crossing related to the alignment of the pair of neutrons in the i_13/2 orbital has been observed in the yrast band of ¹⁷³Yb. Among contributions concerning experimental methods and instrumentation, I would like to call attention to an interesting proposal to use the beam of of the Warsaw Cyclotron for radiobiological studies. As was already mentioned, most of the work presented in this Annual Report results from close collaboration with our colleagues from many foreign as well as Polish research institutes and universities. In this place, I would like to express our deep gratitude to all our friends and collaborators around the world. I would also like to acknowledge the financial support of the Polish State Committee for Scientific Research. (author)