Signature splitting and quasiparticle alignment in the yrast band of Ta-165
Signature splitting and quasiparticle alignment in the yrast band of Ta-165
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DOI：
10.1103/physrevc.63.024303
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发表时间：
2001-01
影响因子：
3.1
通讯作者：
D. Roux;Fetea;E. Gueorguieva;B. Babu;R. Newman;J. Lawrie;R. Fearick;D. Aschman;R. Beetge;M. Benatar;G. K. Mabala;S. Mullins;S. Murray;S. Naguleswaran;C. Rigollet;J. Sharpey-Schafer;F. Smit;W. Whittaker
中科院分区：
文献类型：
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作者：
D. Roux;Fetea;E. Gueorguieva;B. Babu;R. Newman;J. Lawrie;R. Fearick;D. Aschman;R. Beetge;M. Benatar;G. K. Mabala;S. Mullins;S. Murray;S. Naguleswaran;C. Rigollet;J. Sharpey-Schafer;F. Smit;W. Whittaker
在Nd-142（Al-27，4 n）Ta-165和Pr-141（Si-28，4 n）Ta-165反应中填充Ta-165的激发态，并使用AFRODITE阵列进行研究。确定了直到自旋53/2（-）的yrast转动衰变序列，并将其归属于[514]9/2（-）组态。核的形状进行了研究，使用总Routhian表面计算。实验结果进行了讨论，在相邻的Ta同位素和曲柄壳模型计算结果的现有数据。出乎意料的大签名分裂，高欧米茄配置，观察到的yrast带。进一步观察到B（M1）/B（E2）比值的带交叉频率和特征分裂的理论值和实验值之间的差异。这些差异的可能性是一个大的偏离轴对称的核形状的后果进行了研究。
Excited states in Ta-165 were populated in the Nd-142(Al-27,4n)Ta-165 and Pr-141(Si-28,4n)Ta-165 reactions and investigated using the AFRODITE array. The yrast rotational decay sequence up to spin 53/2(-) is identified and assigned to the [514]9/2(-) configuration. The nuclear shape is investigated using total Routhian surface calculations. The experimental results are discussed in relation to existing data in the neighboring Ta isotopes and results from cranked shell model calculations. Unexpectedly large signature splitting, for a high-Omega configuration, is observed in the yrast band. Further discrepancies are observed between theoretical and experimental values for the band crossing frequency and signature splitting of the B(M1)/B(E2) ratios. The possibility that these discrepancies are a consequence of a large deviation from an axially symmetric nuclear shape is investigated.