$^{17}$C中的非束缚中子$\nu0d_{3/2}$强度与N=16壳隙
核实验
2025-05-28 v3 核理论
摘要
在束流能量为17.2 MeV/核子的d(C,p)反应中，观察到生成的C中布居了显著的连续态强度。该强度出现在单中子衰变阈值以上大于约2 MeV处，并被确定为源自向中子轨道的转移。在壳模型预言的指导下，绝大部分强度与激发能为4.40 MeV的3/2态以及一个位于5.60 MeV的弱得多的3/2能级相关联。相应的总宽度分别确定为3.45和1.6 MeV。根据后角质子微分截面以及向C(2)能级中子衰变的分支比，推导出到基态的相应谱因子为0.47和0.09。采用唯象SFO-tls相互作用的壳模型计算以及包含连续态效应的Gamow壳模型计算与实验符合得相当好，尽管预言的强度位于稍低的能量处。N=16壳隙（）的大小估计为5.08 MeV——比SFO-tls壳模型计算中发现的值大约1.3 MeV。
引用
@article{arxiv.2505.11696,
title = {Unbound neutron $\nu0d_{3/2}$ strength in $^{17}$C and the N=16 shell gap},
author = {J. Lois-Fuentes and B. Fernández-Domínguez and F. Delaunay and X. Pereira-López and N. A. Orr and M. Płoszajczak and N. Michel and T. Otsuka and T. Suzuki and W. N. Catford and O. Sorlin and N. L. Achouri and M. Assié and S. Bailey and B. Bastin and Y. Blumenfeld and R. Borcea and M. Caamaño and L. Caceres and E. Clément and A. Corsi and N. Curtis and Q. Deshayes and F. Farget and M. Fisichella and G. de France and S. Franchoo and M. Freer and J. Gibelin and A. Gillibert and G. F. Grinyer and F. Hammache and O. Kamalou and A. Knapton and Tz. Kokalova and V. Lapoux and J. A. Lay and B. Le Crom and S. Leblond and F. M. Marqués and A. Matta and P. Morfouace and A. Moro and J. Pancin and L. Perrot and J. Piot and E. Pollacco and P. Punta and D. Ramos and C. Rodríguez-Tajes and T. Roger and F. Rotaru and M. Sénoville and N. de Séréville and R. Smith and M. Stanoiu and I. Stefani and C. Stodel and D. Suzuki and J. C. Thomas and N. Timofeyuk and M. Vandebrouck and J. Walshe and C. Wheldon},
journal= {arXiv preprint arXiv:2505.11696},
year = {2025}
}