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arXiv 1602.01588nucl-thnucl-ex
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相对论点耦合超子-核子相互作用微观粒子转子模型下的低能超核能谱

Low-energy hypernuclear spectra with microscopic particle-rotor model with relativistic point coupling hyperon-nucleon interaction

H. Mei, K. Hagino, J. M. Yao, T. Motoba

摘要:

通过在点耦合核子- $Λ$粒子($NΛ$)相互作用中引入导数和张量耦合项,扩展了超核低能态的微观粒子转子模型.以$^{13}_{~Λ}$ C为例,我们表明,一个很好的整体描述的激发光谱实现了四套有效的$NΛ$相互作用。我们发现$Λ$超子结合能随高阶相互作用项强度的增加而单调减小。特别地,张量耦合项降低了第一$1/2^-$和$3/2^-$状态之间的能量分裂,并增加了$^{13}_{~Λ}$ C中第一$3/2^+$和$5/2^+$状态之间的能量分裂。

英文摘要:

We extend the microscopic particle-rotor model for hypernuclear low-lying states by including the derivative and tensor coupling terms in the point-coupling nucleon-$Λ$ particle ($NΛ$) interaction. Taking $^{13}_{~Λ}$C as an example, we show that a good overall description for excitation spectra is achieved with four sets of effective $NΛ$ interaction. We find that the $Λ$ hyperon binding energy decreases monotonically with increasing the strengths of the high-order interaction terms. In particular, the tensor coupling term decreases the energy splitting between the first $1/2^-$ and $3/2^-$ states and increases the energy splitting between the first $3/2^+$ and $5/2^+$ states in $^{13}_{~Λ}$C.

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