Barranco F, Potel G, Broglia R A, Vigezzi E
Departamento de Fìsica Aplicada III, Escuela Superior de Ingenieros, Universidad de Sevilla, Camino de los Descubrimientos, 41092 Sevilla, Spain.
National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
Phys Rev Lett. 2017 Aug 25;119(8):082501. doi: 10.1103/PhysRevLett.119.082501. Epub 2017 Aug 24.
The exotic nucleus ^{11}Be has been extensively studied and much experimental information is available on the structure of this system. We treat, within the framework of renormalized nuclear field theory in both configuration and 3D space, the mixing of bound and continuum single-particle states through the coupling to collective vibrations of the ^{10}Be core. We also take care of the Pauli principle acting not only between the single valence particle explicitly considered and those participating in the collective states, but also between fermions involved in two-phonon virtual states dressing the single-particle motion. In this way, it is possible to simultaneously and quantitatively account for the energies of the 1/2^{+}, 1/2^{-} low-lying states, the centroid and line shape of the 5/2^{+} resonance and the one-nucleon stripping and pickup absolute differential cross sections involving ^{11}Be as either target or residual nucleus. Also for the dipole transition connecting the 1/2^{+} and 1/2^{-} parity inverted levels as well as the isotopic shift of the charge radius. Theory provides a unified and exhaustive nuclear structure and reaction characterization of the many-body effects which are at the basis of this paradigmatic one-neutron halo system.
奇异核(^{11}Be)已得到广泛研究，关于该系统结构有许多实验信息。我们在组态空间和三维空间的重整化核场论框架内，通过与(^{10}Be)核心集体振动的耦合，处理束缚态和连续单粒子态的混合。我们还考虑了泡利原理，它不仅作用于明确考虑的单价粒子与参与集体态的粒子之间，还作用于参与单粒子运动的双声子虚态中的费米子之间。通过这种方式，可以同时定量地解释(1/2^{+})、(1/2^{-})低激发态的能量、(5/2^{+})共振的质心和线形，以及涉及(^{11}Be)作为靶核或剩余核的单核子剥离和拾取绝对微分截面。对于连接(1/2^{+})和(1/2^{-})宇称反转能级的偶极跃迁以及电荷半径的同位素位移也是如此。该理论提供了一个统一且详尽的核结构以及对多体效应的反应表征，而这些多体效应是这个典型的单中子晕系统的基础。
