@phdthesis{oai:tsukuba.repo.nii.ac.jp:00008351,
 author = {坂本, 秀生 and Sakamoto, Hideo},
 month = {},
 note = {Anharmonicities in nuclear quadrupole collective motions are studied in detail by deriving first the selfconsistent effective interactions and then by applying a boson expansion method. Our theory of effective interactions in nuclei is based on the concept of nuclear saturation and the selfconsistency between the shape of an average potential and that of a density distribution (nuclear selfconsistency). The higher-order effective interactions (e.g. a three-body interaction, etc. ) are derived by imposing the nuclear selfconsistency in higher-order accuracy when other modes are simultaneously excited in the system. The interactions thus derived are carefully examined. A theory is generalized further to a system with a velocity-dependent potential, yeilding multipole-pairing interactions. The selfconsistent effective interactions thus derived are applied to the mcroscopic analyses of anharmonicities in nuclear quadrupole collective motions. The numerical calculations are made in terms of the boson expansion technique developed by Kishimoto and Tamura with several new refinements, such as the removal of spurious excitation modes and the inclusion of all possible noncollective excitations. From the analyses, it is demonstrated that the three-body interaction provides an important mechanism to restore the order in the system, which otherwise would have been destroyed. General agreements with experimental date on nuclei in various mass region have confirmed that our theory is capable of describing various types of anharmonicities characteristic to the nuclei in question., 1986},
 school = {筑波大学, University of Tsukuba},
 title = {Microscopic analysis of anharmonicities in nuclear quadrupole collective motions by use of the improved self-consistent effective interaction},
 year = {1987}
}