Changes in νg9/2 shape polarisation across the odd neutron-rich Cr isotopes
Changes in νg9/2 shape polarisation across the odd neutron-rich Cr isotopes
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DOI：
10.1016/j.physletb.2005.07.005
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发表时间：
2005-08
影响因子：
4.4
通讯作者：
A. Deacon;S. Freeman;R. Janssens;F. Xu;M. Carpenter;I. R. Calderin;P. Chowdhury;N. Hammond
中科院分区：
文献类型：
--
作者：
A. Deacon;S. Freeman;R. Janssens;F. Xu;M. Carpenter;I. R. Calderin;P. Chowdhury;N. Hammond
在束流能量为130MeV的C14(Ca48，αn)反应中，57Cr的激发态被填充到高自旋。在YRAST9/2+能级之上建立了一个规则的伸展四极跃迁序列。这一序列被解释为与奇中子激发进入1/2+[440]轨道所引起的长形变有关的旋转带。总的Routhian表面计算，遵循这种构型到高自旋，再现了观察到的带的特征。他们也能够解释类似的，但不太发达的55Cr结构。相反，59Cr中的9/2+异能态似乎是由9/2+[404]组态主导的带头态，这在扁平变形时是有利的。这种显著的差异对理论描述提出了重大挑战，但与59Cr中低洼的负宇称态所表现出的特征是一致的。
Excited states in57Cr have been populated to high spin in the C14(Ca48,αn) reaction at a beam energy of 130 MeV. A regular sequence of stretched quadrupole transitions has been established above the yrast 9/2+level. This sequence is interpreted as a rotational band associated with prolate deformation induced by the excitation of the odd neutron into the 1/2+[440] orbital. Total Routhian surface calculations, which follow this configuration to high spin, reproduce the observed features of the band. They are also able to account for a similar, but less well developed structure in55Cr. In contrast, the isomeric yrast 9/2+state in59Cr appears to be a band-head state dominated by the 9/2+[404] configuration, which is favoured at oblate deformations. Such a marked difference presents a significant challenge for theoretical descriptions, but is consistent with features exhibited by the low-lying negative-parity states in59Cr.