Nucleon pair approximation of the nuclear collective motion - art. no. 014315

The nucleon pair shell model calculation is performed in terms of the SD co llective pairs which are obtained in a suitable way to obtain the maximum c ollectivity. The method is applied to even-even Sn, Te, Xe, Ba, and Ce isot opes near the A = 130 region employing the (monopole and quadrupole) pairin g plus quadrupole-quadrupole-type interaction with a very few parameters. T he structure of energy levels for the quasi-gamma band as well as the groun d band is well reproduced in each nucleus. Other properties such as E2 tran sition rates and binding energies also agree with experimental data very we ll. The overall fit with the experimental data is superior to the previous calculations.