The Borromean halo nucleus ⁶He has been studied by a kinematically complete measurement of Coulomb and nuclear breakup into α + 2n on Pb and C targets at 70 MeV/nucleon. Fully quantum-mechanical four-body breakup calculations reproduce the energy and angular differential cross sections below ${\mathit{\text{E}}}_{\mathrm{rel}}\sim 1$ MeV for both targets. The model used here reproduces the ⁶He ground-state properties as well as α-n and n-n scattering data and predicts an average opening angle $〈{\theta }_{nn}〉$ of 68^∘ between the two halo neutrons. However, the model underestimates the breakup cross sections for higher ${\mathit{\text{E}}}_{\mathrm{rel}}$, indicating a possible contribution from the inelastic breakup. Alternatively, we examine the empirically modified calculations that reproduce the energy-differential cross sections for a wide range of scattering angles for both targets. The extracted B(E1) peaks at ${\mathit{\text{E}}}_{\mathrm{rel}}\sim 1.4$ MeV and amounts to 1.6(2) e² fm² for ${\mathit{\text{E}}}_{\mathrm{rel}}$ ≤ 20 MeV, resulting $〈{\theta }_{nn}〉$ = 56${}_{-10}^{+9}$ degrees. In either interpretation, the current results show evidence of the dineutron spatial correlation in ⁶He.

通过运动学上完整的库仑（Coulomb）运动和在70 MeV /核子的Pb和C靶上将核分裂成α + 2 n的研究，研究了Borromean晕核⁶ He 。完全量子力学的四体分解计算可重现下面的能量和角度微分截面${\mathit{\text{Ë}}}_{\mathrm{rel}}〜\mathrm{1个}$两个目标的MeV。这里使用的模型再现了⁶ He的基态特性以及α - n和n - n散射数据，并预测了平均打开角度$〈{\theta }_{ññ}〉$68 ^∘的两个卤素中子之间。但是，该模型低估了破碎截面${\mathit{\text{Ë}}}_{\mathrm{rel}}$，表明可能是非弹性破裂造成的。另外，我们研究了经验修正的计算方法，该方法针对两个目标的较大散射角范围再现了能量差截面。提取的B（E 1）峰在${\mathit{\text{Ë}}}_{\mathrm{rel}}〜1.4$兆电子伏和量〜1.6（2）在线²  FM ²为${\mathit{\text{Ë}}}_{\mathrm{rel}}$ ≤20 MeV，结果 $〈{\theta }_{ññ}〉$ = 56${}_{-10}^{+9}$度。无论采用哪种解释，目前的结果均显示了⁶ He中中子空间相关性的证据。