The β＋/EC decay of doubly odd nucleus ^176Ir has been studied via the ^146Nd（^35Cl, 5n7） heavy ion fusion evaporation reaction at 210MeV bombarding energy. With the aid of a helium-jet recoil fast tape transport s...The β＋/EC decay of doubly odd nucleus ^176Ir has been studied via the ^146Nd（^35Cl, 5n7） heavy ion fusion evaporation reaction at 210MeV bombarding energy. With the aid of a helium-jet recoil fast tape transport system, the reaction products were transported to a low-background location for measurement. Based on the data analysis, the previously known γ rays from the decay of ^176Ir are proven. Moreover, three new excited levels and ten new γ rays are assigned to ^176Os. The time spectra of typical γ rays clearly indicate a long-lived low-spin isomer in ^176Ir.展开更多
High spin states in ^188Tl have been investigated via the 157Gd（^35Cl,4n） reaction at beam energy of 170 MeV. A rotational band built on the πh9/2 × vi13/2 configuration with oblate deformation has been establ...High spin states in ^188Tl have been investigated via the 157Gd（^35Cl,4n） reaction at beam energy of 170 MeV. A rotational band built on the πh9/2 × vi13/2 configuration with oblate deformation has been established. Considering the similarity between the band structure observed in odd-odd Tl nuclei, spin values have been tentatively proposed for the new band in ^188Tl. The πh9/2 × vi13/2 oblate band in ^188Tl shows low-spin signature inversion, and it can be interpreted qualitatively by the two quasiparticle plus rotor model including a J-dependent p-n residual interaction.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 10025525, 10375077, and 10221003, the Major State Basic Research Development Program under Grant No G2000077400, and the Chinese Academy of Sciences.
文摘The β＋/EC decay of doubly odd nucleus ^176Ir has been studied via the ^146Nd（^35Cl, 5n7） heavy ion fusion evaporation reaction at 210MeV bombarding energy. With the aid of a helium-jet recoil fast tape transport system, the reaction products were transported to a low-background location for measurement. Based on the data analysis, the previously known γ rays from the decay of ^176Ir are proven. Moreover, three new excited levels and ten new γ rays are assigned to ^176Os. The time spectra of typical γ rays clearly indicate a long-lived low-spin isomer in ^176Ir.
基金Supported by the National Natural Science Foundation of China under Grant Nos 10475097, 10375077, and 10221003.
文摘High spin states in ^188Tl have been investigated via the 157Gd（^35Cl,4n） reaction at beam energy of 170 MeV. A rotational band built on the πh9/2 × vi13/2 configuration with oblate deformation has been established. Considering the similarity between the band structure observed in odd-odd Tl nuclei, spin values have been tentatively proposed for the new band in ^188Tl. The πh9/2 × vi13/2 oblate band in ^188Tl shows low-spin signature inversion, and it can be interpreted qualitatively by the two quasiparticle plus rotor model including a J-dependent p-n residual interaction.
