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用重离子束3 5 Ar轰击缺中子同位素靶92 Mo ,96Ru和10 6Cd产生了质子滴线附近的β缓发质子先驱核12 5 Nd ,12 8Pm ,12 9Sm ,13 7Gd和13 9Dy .配合氦喷嘴带传输系统用“p γ”符合方法对它们进行了肯定的鉴别 .它们的半衰期分别为 :0 .6 0 ( 1 5 )s,1 .0 ( 3)s ,0 .5 5 ( 1 0 )s ,2 .2 ( 2 )s和 0 .6 ( 2 )s.用统计模型理论计算对实验测定的12 5 Nd ,12 9Sm ,13 7Gd和13 9Dy的 ,和从前报道的12 1Ce ,13 5 Gd的β缓发质子衰变的能谱和分支比进行了拟合 .提取出12 1Ce ,12 5 Nd ,12 9Sm ,13 5 Gd ,13 7Gd和13 9Dy的基态自旋 宇称分别为5 / 2 ± ,5 / 2 ± ,1 / 2 +(或 3/ 2 +) ,5 / 2 +,7/ 2 ± 和 7/ 2 +.实验初步指认的基态自旋 宇称值与Nilsson能级图的预言值相符间接表明这 6种核素的基态具有大形变 ,形变参数 β2在 0 .3左右 .
The β-delayed proton nuclei, 125 Nd, 12 9Sm, 13 7Gd and 13 9Dy, near the proton drip line were generated by heavy ion beam bombardment of the neutron isotope targets 92 Mo, 96Ru and 106C with heavy ion beams. The helium nozzle tape delivery systems were positively identified by the “p γ” method, with half-lives of 0.660 (1.5 s), 1.0 (3) s, 0.55 (1) 0) s, 2 .2 (2) s, and 0 .6 (2) s. Calculations of the experimental measured 12 5 Nd, 12 9Sm, 13 7Gd and 13 9Dy and previously reported 12 1Ce, The energy spectra and branching ratios of β-delayed proton decay of 13 5 Gd were fitted and the ground state spin parity of 12 1Ce, 12 5 Nd, 12 9Sm, 13 5 Gd, 13 7Gd and 13 9Dy were extracted as 5 / 2 ±, 5/2 ±, 1/2 + (or 3/2 +), 5/2 +, 7/2 ± and 7/2 +. The initial tentatively identified ground state spin parity and Nilsson level The predictions of the graph coincide with each other indirectly, indicating that the ground state of these six species of nuclei has a large deformation, and the deformation parameter β2 is about 0.3.