Suppression of band crossing in the neutron-rich nuclei 172, 173Yb due to the absence of a static pair field
Suppression of band crossing in the neutron-rich nuclei 172, 173Yb due to the absence of a static pair field
复制标题
由于缺乏静态对场而抑制富中子核 172、173Yb 中的带交叉
DOI：
10.1140/epja/i2005-10132-1
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
S. Frauendorf
中科院分区：
文献类型：
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作者：
T. Venkova;W. Gast;R. Lieder;D. Bazzacco;G. de Angelis;E. Lieder;A. Pasternak;R. Menegazzo;S. Lunardi;C. Rossi Alvarez;C. Ur;T. Martinez;M. Axiotis;D. Napoli;W. Urban;T. Rząca;S. Frauendorf
摘要：在 170Er(7Li,(p,d,t)xn) 不完全聚变反应中，富中子核 172,173Yb 中出现高自旋态，并用 GASP 阵列检测到发射的 γ 辐射。奇数 N173Yb 同位素 7/2+[633] 旋转带的特征伙伴已新建立，并分别观察到自旋值高达 (45/2+) 和 (43/2+)。偶偶核 172Yb 的基态能带已被观测到自旋值高达 (22+)。在这些带中没有发现带交叉。为了解释这一观察结果，考虑到这些核的中子奇偶质量差达到非常小的值，并且在没有配对的曲柄壳模型计算中不存在能带交叉，因此提出不存在静态对场。然而，结果表明，仍然存在很强的动态相关性。
Abstract.High-spin states in the neutron-rich nuclei 172,173Yb have been populated in a 170Er(7Li,(p,d,t)xn) incomplete-fusion reaction and the emitted γ-radiation was detected with the GASP array. The signature partners of the 7/2+[633] rotational band of the odd-N173Yb isotope have been newly established and were observed up to spin values of (45/2+) and (43/2+), respectively. The ground-state band of the even-even nucleus 172Yb has been observed up to a spin value of (22+). No band crossings were found in these bands. To explain this observation, it is proposed that the static pair field is absent, considering that the neutron odd-even mass differences reach for these nuclei very small values and that the band crossing is absent in cranked shell modell calculations without pairing. The results indicate, however, that strong dynamic correlations are still present.