Object of the study: the inclusive scattering of electrons by the 7Li nucleus. Objective: the experimental investigation of the longitudinal response function RL(q,w), the Coulomb sum SL(q) in a wide range of momentum transferred q and the Coulomb energy Ecoul of the 7Li nucleus. Methods: the numerical simulation method of electrons passing through a substance (GEANT-3); the least squares method; the Rosenblut method. Theoretical and practical results, scientific novelty: for the first time, the experimental values of the longitudinal response function, the Coulomb sum and the Coulomb energy of the 7Li nucleus have been obtained; the behavior of the 7Li Coulomb sum from momentum transferred manifested an anomaly as before observable in the case of the 6Li nucleus; the algorithm for modeling the photoproduction process e+, e- - pairs in the target substance, which allows to significantly reduce simulation time, has been developed; a method for analyzing the behavior of the longitudinal response function at large transferred energies is proposed and the exponent of the power function used to extrapolate the response function into the region transferred energies to infinity has been obtained; a revision of the values of ground state form factor of the 12C nucleus, considered to be reference, has been performed , and the 3% systematic error has been found in them. Practical significance: the obtained experimental values of longitudinal response function RL(q,w) and Coulomb sum SL(q) of the 7Li nucleus can be used for testing of modern models of nucleon-nucleon interaction in nucleus; the observed dependence of the transferred momentum value, above which the Coulomb sum becomes constant, from the parameter x, which characterizes the degree of nuclear clusterization, can be used for the experimental determination of the x value; the calculated values of the Coulomb energy Ecoul and its components I1, I2 of the 7Li nucleus, together with the same data for 4He and 6Li, are important for the investigation of clustering of light nuclei. Scope of application: for theoretical and experimental researches aimed at studying of the nuclear interaction mechanism and atomic nuclei structure, which are held at such scientific centers as the National Science Center "Kharkiv Physical and Technical Institute" of the National Academy of Sciences of Ukraine, VN Karazin Kharkiv National University of the Ministry of Education and Science of Ukraine, Taras Shevchenko National University of Kyiv of the Ministry of Education and Science of Ukraine, Institute of Nuclear Research of the National Academy of Sciences of Ukraine (Kyiv), Institute of Theoretical Physics of the National Academy of Sciences of Ukraine (Kyiv), Jefferson LAB (USA), Department of Physics University of Trento (Italy) and others; international science-metric databases.
