Comprehensive study of the three- and four-neutron systems at low energies
Comprehensive study of the three- and four-neutron systems at low energies
复制标题
DOI：
10.1103/physrevc.103.024004
复制
发表时间：
2020-11
影响因子：
3.1
通讯作者：
Michael Denis Higgins;C. Greene;A. Kievsky;M. Viviani
中科院分区：
文献类型：
--
作者：
Michael Denis Higgins;C. Greene;A. Kievsky;M. Viviani
本文用绝热超球方法进一步分析了低能区的三中子和四中子系统。在上一篇文章中，[M。D.希金斯等人，物理学评论快报125，052501（2020）]，这些中子系统的低能行为在绝热近似下处理，忽略非对角非绝热耦合。通过多通道处理的三个和四个中子散射附近的散射连续阈值的状态密度进行了彻底的分析，没有证据表明在低能量的4 n $共振。对最低的几个绝热超球势的长程行为的详细分析表明，在多通道散射的低能区，有一个有吸引力的${\ensuremath{\rho}}^{\ensuremath{-}3}$普适行为。这种长程行为导致了$E\ensuremath{\rightarrow}0$的态密度的发散行为，这可以解释Kisamori等人在2016年实验中观察到的低能信号。116，052501（2016）]。
This work presents further analysis of the three- and four-neutron systems in the low energy regime using adiabatic hyperspherical methods. In our previous article [M. D. Higgins et al., Phys. Rev. Lett. 125, 052501 (2020)], the low-energy behavior of these neutron systems was treated in the adiabatic approximation, neglecting the off-diagonal nonadiabatic couplings. A thorough analysis of the density of states through a multichannel treatment of the three-and four-neutron scattering near the scattering continuum threshold is performed, showing no evidence of a $4n$ resonance at low energy. A detailed analysis of the long-range behavior of the lowest few adiabatic hyperspherical potentials shows there is an attractive ${\ensuremath{\rho}}^{\ensuremath{-}3}$ universal behavior which dominates in the low-energy regime of the multichannel scattering. This long-range behavior leads to a divergent behavior of the density of state for $E\ensuremath{\rightarrow}0$ that could account for the low-energy signal observed in the 2016 experiment by Kisamori et al. [Phys. Rev. Lett. 116, 052501 (2016)].