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首页> 外文期刊>Nuclear Physics, A: Journal Devoted to the Experimental Study of the Fundamental Constituents of Matter and Their Actions >SHAPE COEXISTENCE IN TL-185 AND TL-187 - INVESTIGATION OF THE DEFORMED MINIMA
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SHAPE COEXISTENCE IN TL-185 AND TL-187 - INVESTIGATION OF THE DEFORMED MINIMA

机译：TL-185和TL-187中的形状共存-变形最小值的调查

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High spin gamma-ray spectroscopy of 185Tl and 187Tl has been performed with the reactions Gd-154(Cl-35, 4n) and Tb-159(S-32, 4n). Positive gamma-ray identification with the thallium isotopes was made via X-ray coincidences, and supported by mass selected gamma-ray spectra, the latter obtained with the reactions Gd-154(Ar-36, p4n) and Gd-155(Ar-36, p3n). Rotational bands associated with both prolate and oblate shape were observed. The bandheads of the proposed oblate 13/2+ [606] states were found to be isomeric, with meanlives of 12 +/- 2 ns in Tl185 and 1.0 +/- 0.2 ns in Tl187. Prolate deformed i13/2 bands were observed in both nuclei, while in Tl187, bands due to h9/2 and f7/2 protons coupled to the prolate shape are also assigned. An h9/2 band is tentatively assigned in Tl185. The observation of these rotation-aligned bands at low excitation energy implies that the development of prolate deformed minima in the odd nuclei is not necessarily blocked by occupation of a single deformation-driving orbital. Equilibrium deformation calculations for intrinsic states in a range of thallium nuclei are presented. Experimental trends with mass number are reproduced, but absolute excitation energies, and energy differences between the prolate and oblate states are not, continuing the persistent discrepancy between theory and experiment in the mercury region. Theoretical calculations of intruder orbital occupation probabilities show a correlation between prolate deformation and h9/2 and f7/2 proton pair population, in particular of the 1/2- [541] orbital from the h9/2 proton shell. They also show that blocking of the 1/2- [541] orbital significantly suppresses the prolate deformation. Implications for the structure of the prolate deformed mercury and thallium isotopes are considered, leading to the conclusion that the prolate mercury core nuclei consist of a mixture of low-OMEGA proton intruder excitations. [References: 46]
机译：已经用反应Gd-154（Cl-35，4n）和Tb-159（S-32，4n）进行了185T1和187T1的高自旋伽马射线光谱。 X同位素通过X射线重合进行了正γ射线鉴定，并得到了质量选择的γ射线光谱的支持，后者通过反应Gd-154（Ar-36，p4n）和Gd-155（Ar- 36，p3n）。观察到与扁圆形和扁圆形相关的旋转带。发现建议的扁圆形13/2 + [606]状态的带状峰是异构体，在Tl185中的平均寿命为12 +/- 2 ns，在Tl187中的平均寿命为1.0 +/- 0.2 ns。在两个原子核中均观察到了扁长变形的i13 / 2带，而在Tl187中，还分配了由于h9 / 2和f7 / 2质子耦合到扁长形状而产生的谱带。在Tl185中暂时分配了一个h9 / 2带。在低激发能下观察到这些旋转取向的带意味着，奇数原子核中扁长形变形极小值的形成并不一定被单个变形驱动轨道占据。提出了intrinsic核范围内固有态的平衡变形计算。重现了具有质量数的实验趋势，但没有绝对激发能，而扁长态和扁圆态之间的能量差却没有，这继续了汞区理论与实验之间的持续差异。入侵者轨道占据概率的理论计算表明，扁长形变形与h9 / 2和f7 / 2质子对种群，特别是h9 / 2质子壳的1 / 2- [541]轨道之间具有相关性。他们还显示，对1 / 2- [541]轨道的阻挡显着抑制了扁平变形。考虑到扁长形变形的汞和th同位素的结构，这意味着扁长的汞芯核由低OMEGA质子入侵者激发的混合物组成。 [参考：46]

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