Seminarium Fizyki Jądra Atomowego

The probability of the β-transition is proportional to the product of the lepton part described by the Fermi function f(Qβ – E) and the nucleon part described by the β transition strength function Sβ(E). Information on the structure of Sβ(Е) is important for many nuclear physics areas. Reliable experimental data on the structure of Sβ(Е) are necessary for predicting half-lives of nuclei far from the stability line, verifying completeness of decay schemes, calculating energy release from decay of fission products in nuclear reactors, calculating spectra of delayed particles, calculating the delayed fission probability and evaluating fission barriers for nuclei far from the β-stability line, calculating production of various elements in astrophysical processes, developing microscopic models for calculation of Sβ(Е), especially in deformed nuclei, and etc.
Development of experimental technique allows application of methods of nuclear spectroscopy with high energy resolution for Sβ(E) fine structure measurement. Methods for investigating the structure of the strength function for the β-decay of atomic nuclei are considered and the results of measuring Sβ(E) by the Total Absorption Gamma Spectroscopy and high-resolution nuclear spectroscopy techniques are presented and discussed. Emphasis is placed on investigation of the fine structure of Sβ(E). Criteria for verifying the completeness of nuclear decay schemes are considered.