$^{16}$Be 的质量、谱学与双中子衰变
核实验
2024-01-31 v1 核理论
摘要
通过高能 B 束流的质子敲出反应，研究了最丰中子铍同位素 Be 的结构与衰变。首次观测到两个相对较窄的共振，其能量分别位于双中子衰变阈值以上 和 MeV，宽度分别为 和 MeV。这两个共振被指认为基态（）和第一激发态（），激发能 MeV。由此推得 Be 的质量过剩为 MeV，比之前唯一的测量结果束缚得更深约 MeV。观察到两个态都通过直接双中子发射衰变。将衰变过程中波函数演化视为真实三体过程的计算，重现了两个能级中子-中子能谱的主要特征，表明基态表现出强烈的空间紧凑双中子组分，而 能级则呈现出更为弥散的中子-中子分布。
引用
@article{arxiv.2401.16817,
title = {Mass, spectroscopy and two-neutron decay of $^{16}$Be},
author = {B. Monteagudo and F. M. Marqués and J. Gibelin and N. A. Orr and A. Corsi and Y. Kubota and J. Casal and J. Gómez-Camacho and G. Authelet and H. Baba and C. Caesar and D. Calvet and A. Delbart and M. Dozono and J. Feng and F. Flavigny and J. -M. Gheller and A. Giganon and A. Gillibert and K. Hasegawa and T. Isobe and Y. Kanaya and S. Kawakami and D. Kim and Y. Kiyokawa and M. Kobayashi and N. Kobayashi and T. Kobayashi and Y. Kondo and Z. Korkulu and S. Koyama and V. Lapoux and Y. Maeda and T. Motobayashi and T. Miyazaki and T. Nakamura and N. Nakatsuka and Y. Nishio and A. Obertelli and A. Ohkura and S. Ota and H. Otsu and T. Ozaki and V. Panin and S. Paschalis and E. C. Pollacco and S. Reichert and J. -Y. Rousse and A. T. Saito and S. Sakaguchi and M. Sako and C. Santamaria and M. Sasano and H. Sato and M. Shikata and Y. Shimizu and Y. Shindo and L. Stuhl and T. Sumikama and Y. L. Sun and M. Tabata and Y. Togano and J. Tsubota and T. Uesaka and Z. H. Yang and J. Yasuda and K. Yoneda and J. Zenihiro},
journal= {arXiv preprint arXiv:2401.16817},
year = {2024}
}