材料期刊网

用组态相关推转壳模型Nilsson势研究了C．M．Parry组最近用EUROBALL谱仪观测到的127La高自旋态结构．实验上观测的127La的宇称和辛量子数为(π,α)=(+,-1/2)的带自旋达到(83/2)h．理论计算结果表明该带可能具有组态π(h11/2)2v(h11/2)6．并且几乎达到该带的带终止理论预言值 I=47.5h．该带的形变在I≤40h内处于正常形变区(ε2≈0.22，γ≈0°)，随着角动量的增加ν值逐渐增加，直到ν＝60°时带终止．

The configuration-dependent shell-correction approach with cranked Nilsson potential is employed for explaining the experimental high-spin spectra in 127La. The experimental high spin band with parity and signature (+,-1/2) consists of two parts with a crossing around I=20h. It is most like to have the configuration[02,6], π(h11/2)2v(h11/2)6 and almost reaching the maximum angular momentum at I=47.5 h. It is in normal deformation region with ε2≈0.22 and γ≈0° up to I=40 h and then moving over the γ-plane to termination atγ＝60。． Comparing calculations and experiment, one notes that the bands are seen to spin values where according to calculation they start to go away clearly from yrast, thus this supports our interpretation. There are strongly deformed (or superdeformed) bands with ε2≈0.35 and ν≈0°. They were calculated to become yrast for I=40h making it very unlikely that the observed bands were strongly deformed. However, they represent a challenge for future experiments. Below I＝21.5 Kthe experimental high spin bands appear to have strong pairing interaction since their moments of inertia go down to 10/2 MeV-1 from I=11.5h to I=19.5 h.