The decay characteristic of \(^{22}\)Si and its ground-state mass significantly affected by three-nucleon forces

• Published in: arXiv.org 2016-10
• Main Authors: Xu, X X, Lin, C J, Sun, L J, Wang, J S, Lam, Y H, Lee, J, Fang, D Q, Li, Z H, Smirnova, N A, Yuan, C X, Yang, L, Wang, Y T, J Li, Ma, N R, Wang, K, Zang, H L, Wang, H W, C Li, Liu, M L, Wang, J G, Shi, C Z, Nie, M W, Li, X F, H Li, Ma, J B, P Ma, Jin, S L, Huang, M R, Bai, Z, Yang, F, Jia, H M, Liu, Z H, Wang, D X, Yang, Y Y, Zhou, Y J, Ma, W H, Chen, J, Hu, Z G, Zhang, Y H, Ma, X W, Zhou, X H, Ma, Y G, Xu, H S, Xiao, G Q, Zhang, H Q
• Format: Article
• Language: English
• Subjects: Beta decay; Beta rays; Charged particles; Nuclei (nuclear physics); Particle emission; Protons; Silicon
• ISSN: 2331-8422

The decay of the proton-rich nucleus \(^{22}\)Si was studied by a silicon array coupled with germanium clover detectors. Nine charged-particle groups are observed and most of them are recognized as \(\beta\)-delayed proton emission. A charged-particle group at 5600 keV is identified experimentally as \(\beta\)-delayed two-proton emission from the isobaric analog state of \(^{22}\)Al. Another charged-particle emission without any \(\beta\) particle at the low energy less than 300 keV is observed. The half-life of \(^{22}\)Si is determined as 27.5 (18) ms. The experimental results of \(\beta\)-decay of \(^{22}\)Si are compared and in nice agreement with shell-model calculations. The mass excess of the ground state of \(^{22}\)Si deduced from the experimental data shows that three-nucleon (3N) forces with repulsive contributions have significant effects on nuclei near the proton drip line.