نواة بهالة: كيف يجعل النيوترون الذرة أكبر سريع

الملخص الأصلي

كما كتبه المؤلفون، بالإنجليزية arXiv:2603.06978

We present an ab initio study of the one-neutron halo nucleus $$^{11}$$Be using nuclear lattice effective field theory with high-fidelity chiral interactions at N3LO. By employing the wavefunction matching method to mitigate the sign problem and the pinhole algorithm to sample many-body correlations, we successfully reproduce the ground-state parity inversion and the extended matter radius characteristic of the halo structure. We analyze the intrinsic density distributions and geometric shapes of $$^{11}$$Be in comparison with the core nucleus $$^{10}$$Be. Our results reveal a prominent two-cluster structure in both nuclei and the occupation of the $$\sigma$$ molecular orbital by the valence neutron in $$^{11}$$Be. It enhances the prolate deformation as well as the diffuse neutron tail, distinct from the $$\pi$$-orbital occupation observed in the $$^{10}$$Be ground state.