L. H. Zhu

Evidence for Octupole Correlations in Multiple Chiral Doublet Bands

Two pairs of positive-and negative-parity doublet bands together with eight strong electric dipole transitions linking their yrast positive- and negative-parity bands have been identified in ^{78}Br. They are interpreted as multiple chiral doublet bands with octupole correlations, which is supported by the microscopic multidimensionally-constrained covariant density functional theory and triaxial particle rotor model calculations. This observation reports the first example of chiral geometry in octupole soft nuclei.

Search for the chiral doublet bands in 122Cs

High spin states in the odd–odd nucleus 122Cs have been studied by in-beam γ-ray spectroscopy with a 107Ag(19F,1p3n) fusion-evaporation reaction at a beam energy of 85 MeV. A previously known πh11/2 ⊗ νh11/2 yrast band was confirmed and its spin I was re-examined. A ΔI = 2 band was identified, which together with another known ΔI = 2 band forms a side band of the πh11/2 ⊗ νh11/2 yrast band. The two observed πh11/2 ⊗ νh11/2 bands are proposed as a pair of chiral doublet bands in 122Cs based on a systematic comparison with those in the neighbouring odd–odd Cs isotopes, as well as the relativistic mean field and the triaxial particle-rotor-model calculations.

Low-spin signature inversion in the {pi}h{sub 9/2}x{nu}i{sub 13/2} oblate band of {sup 190}Tl

High-spin states in {sup 190}Tl have been studied experimentally by using the {sup 160}Gd({sup 35}Cl,5n) fusion-evaporation reaction at beam energies of 167 and 175 MeV. A rotational band built on the {pi}h{sub 9/2}x{nu}i{sub 13/2} configuration with oblate deformation has been established for {sup 190}Tl. Spin values are assigned by adopting the results from {alpha}-{gamma} decay work for {sup 194}Bi found in the literature. With the configuration and spin-parity assignments, the low-spin signature inversion has been revealed for the {pi}h{sub 9/2}x{nu}i{sub 13/2} oblate band in {sup 190}Tl. It is the first experimental observation of low-spin signature inversion for a band associated with the oblate {pi}h{sub 9/2}x{nu}i{sub 13/2} configuration. The low-spin signature inversion for the oblate {pi}h{sub 9/2}x{nu}i{sub 13/2} band can be interpreted by the two-quasiparticle-plus-rotor model including a J-dependent p-n residual interaction.High-spin states in Tl-190 have been studied experimentally by using the Gd-160(Cl-35,5n) fusion-evaporation reaction at beam energies of 167 and 175 MeV. A rotational band built on the pi h(9/2)circle times nu i(13/2) configuration with oblate deformation has been established for Tl-190. Spin values are assigned by adopting the results from alpha-gamma decay work for Bi-194 found in the literature. With the configuration and spin-parity assignments, the low-spin signature inversion has been revealed for the pi h(9/2)circle times nu i(13/2) oblate band in Tl-190. It is the first experimental observation of low-spin signature inversion for a band associated with the oblate pi h(9/2)circle times nu i(13/2) configuration. The low-spin signature inversion for the oblate pi h(9/2)circle times nu i(13/2) band can be interpreted by the two-quasiparticle-plus-rotor model including a J-dependent p-n residual interaction.

Summing coincidence correction for γ-ray measurements using the HPGe detector with a low background shielding system

A Monte Carlo method based on the GEANT4 toolkit has been developed to correct the full-energy peak (FEP) efficiencies of a high purity germanium (HPGe) detector equipped with a low background shielding system, and moreover evaluated using summing peaks in a numerical way. It is found that the FEP efficiencies of

Plastic scintillation detectors for precision Time-of-Flight measurements of relativistic heavy ions

^{60}

High-spin states and collective band structures in the odd–odd 140Pm nucleus

Co,

Signature splitting inversion and backbending in80Rb

^{133}

Evolution of the X(5) critical-point symmetry in rotating \mathrm{\mathbf {^{176}Os}}

Ba and

Magnetic Rotation and Chirality and X(5) Critical Symmetry in Nucleus

^{152}

High-Spin States and Level Structure in Stable Nucleus Strontium-84

Eu can be improved up to 18\% by taking the calculated true summing \mbox{coincidence} factors (TSCFs) correction into account. Counts of summing coincidence