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arXiv 1806.02936nucl-th
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丰中子氦同位素的能谱:复杂化简单

Energy Spectrum of Neutron-Rich Helium Isotopes: Complex Made Simple

K. Fossez, J. Rotureau, W. Nazarewicz

摘要:

我们证明,复杂的富中子氦同位素的能谱可以直接描述利用低能量的中子-中子相互作用和规模分离,是存在于稀释滴线系统。通过使用基于晕有效场论的参数,我们在$spd$空间中对复能组态相互作用框架进行了参数约化,包括共振态和散射态。通过调整一个参数,自旋单重态中心中子-中子相互作用的强度,我们重现实验的能量和宽度的$^{5-8}$ He在几十keV的精度。我们预测了$^{9}$ He的窄共振宇称反转,并表明$^{10}$ He的基态是一个$s$波主导的阈值组态,可以通过双中子发射衰变。

英文摘要:

We demonstrate that the intricate energy spectrum of neutron-rich helium isotopes can be straightforwardly described by taking advantage of the low-energy properties of neutron-neutron interaction and the scale separation that is present in diluted dripline systems. By using arguments based on the halo effective field theory, we carry out a parameter reduction of the complex-energy configuration interaction framework in the $spd$ space, including resonant and scattering states. By adjusting only one parameter, the strength of the spin-singlet central neutron-neutron interaction, we reproduce experimental energies and widths of $^{5-8}$He within tens of keV precision. We predict a parity inversion of narrow resonances in $^{9}$He and show that the ground state of $^{10}$He is an $s$-wave-dominated threshold configuration that could decay through two-neutron emission.

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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