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引用次数: 0
摘要
这项工作报告了相互作用玻色子模型在 48Ca 附近轻质量区域的新应用,其中考虑到了侵入态和构型混合。结果表明,该模型合理地描述了从硅到铁的 N = 28 偶偶同素异形体以及偶偶钙同素异形体中观测到的低洼镱态和镱态。从球形构型和变形侵入构型之间的竞争角度探讨了状态的性质,并检验了 N = 28 壳间隙的刚性,特别是 44S 的刚性。结果表明,44S 中的异构体产生于两种构型之间的微弱混合,被称为形状异构体。此外,还利用 N = 28 壳间的核跃迁研究了 46Ar 中未解析的低频光谱。本计算支持 42Si 中的 SU(3) 结构。发现了 50Ti、52Cr、54Fe 和 42、44、46Ca 同位素的近似球形性质,同时发现核激发对于描述稀态至关重要。为了进行比较,还进行了壳模型计算。
Weakening of N = 28 shell gap and the nature of 02+ states
The work reports a novel application of the interacting boson model in light-mass region around 48Ca, that takes into account intruder states and configuration mixing. The model is shown to provide a reasonable description of the observed low-lying yrast and yrare states of the N = 28 even–even isotones from Si to Fe, and even–even Ca isotopes. The nature of states is addressed in terms of the competition between spherical and deformed intruder configurations, and the rigidity of the N = 28 shell gap is tested, particularly for 44S. The isomer in 44S is shown to arise from a weak mixing between the two configurations and called as shape isomer. The unresolved low-lying spectra in 46Ar is also approached using the core-excitations across N = 28 shell. The SU(3) structure in 42Si is supported by the present calculation. The nearly spherical nature of 50Ti, 52Cr, 54Fe and 42,44,46Ca isotopes is found, while the core excitations are found to be essential for the description of yrare states. Shell model calculation is also performed for comparison.
期刊介绍:
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