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arXiv 1707.07527nucl-th
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$^{66}$ As中$T=1$和$T=0$带的壳模型结果

Shell model results for $T=1$ and $T=0$ bands in $^{66}$As

Praveen C. Srivastava, R. Sahu, V. K. B. Kota

摘要:

在完整的$f_{5/2}pg_{9/2}$模型空间内,对最近可用的实验数据进行全面壳模型(SM)分析的结果[P. Ruotsalainen等人,物理学Rec. C {88},024320(2013)],在奇-奇$N=Z$核$^{66}$ As中具有四条$T=0$带和一条$T=1$带。计算采用B.A.布朗和A.F. Lisetskiy为这个模型空间。对于最低的两个$T=0$带和一个$T=1$带,计算结果与实验数据符合较好,并采用形变壳模型来确定它们的本征结构。对于$T=1$带,预测在$8^+$处的结构变化。对于具有$T=0$的第三个$9^+$带,壳模型$B(E2)$值和四极矩(除了能量之外)与耦合到$^{64}$ Ge地面带的$g_{9/2}$轨道中的对齐的等序$np$对的解释是一致的。同样,在分析中发现带4的$9^+$能级和邻近的$5^+$能级是同分异构态。最后,使用具有正宇称和负宇称的壳模型计算的第5带成员的能量表明,观察到的能级很可能是负宇称能级。用jj 44 b的SM结果也与用JUN 45相互作用获得的结果进行了比较。

英文摘要:

Results of a comprehensive shell model (SM) analyses, within the full $f_{5/2}pg_{9/2}$ model space, of the recently available experimental data [P. Ruotsalainen et al., Phy. Rec. C {88}, 024320 (2013)] with four $T=0$ bands and one $T=1$ band in the odd-odd $N=Z$ nucleus $^{66}$As are presented. The calculations are performed using jj44b effective interaction developed recently by B.A. Brown and A.F. Lisetskiy for this model space. For the lowest two $T=0$ bands and the $T=1$ band, the results are in reasonable agreement with experimental data and deformed shell model is used to identify their intrinsic structure. For the $T=1$ band, structural change at $8^+$ is predicted. For the third $9^+$ band with $T=0$, the shell model $B(E2)$ values and quadrupole moments (in addition to energies) are consistent with the interpretation in terms of aligned isoscalar $np$ pair in $g_{9/2}$ orbit coupled to the $^{64}$Ge ground band. Similarly, the $9^+$ level of band 4 and a close lying $5^+$ level are found to be isomeric states in the analysis. Finally, energies of the band 5 members calculated using shell model with both positive and negative parity show that the observed levels are most likely negative parity levels. The SM results with jj44b are also compared with the results obtained using JUN45 interaction.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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