On the investigation results of properties of the far-from-stability nuclei by IRIS-YaSNAPP collaboration

Main results obtained in 1983-85 yrs by the IRIS-YaSNAPP (JINR-LIYaF) collaboration workers according to the program for the investigation of properties of far-from-β-stability band nuclei using the 660 and 1000 MeV proton beam to produce nuclei, are presented. Direct measurement of far-from-nuclide masses is rather a difficult problem, mainly, due to their low yield in nuclear reactions. It is suggested to use the fact that the nucldes of rare earths and heavier neutron-deficient elements undergo successive α-decay forming long ''chains'' breaking at N-82 or 83. Then, nuclides in chain foundations undergo β+-decay reaching nuclei with well-known masses near the stability band. The results about masses and proton binding energy of nuclei series in the A=150-180 range, renormalized values of the ratio of axial-vector and vector weak interaction constants for half-magic mother nuclei with N=82 are presented. The boundary of proton stability of nuclei in the A=150-180 region is identified. Properties of the 64146Gd82 ''magic'' nucleus are considered