Lifetime of Antibaryon Bound in Finite Nuclei

• Published in: Communications in theoretical physics 2010-01, Vol.53 (1), p.128-132
• Main Author: 陈曦 李宁 姚海波 秦旭明 吴式枢
• Format: Article
• Language: English
• Subjects: 寿命计算; 执行标准; 有效质量; 有限核; 核密度; 核研究; 狄拉克; 量子场论
• ISSN: 0253-6102
• DOI: 10.1088/0253-6102/53/1/27

The study of finite nuclei containing antibaryon（s） in addition to nucleons is an interesting topic in nuclear physics. The calculation of the lifetime of an antibaryon embedded in a nucleus was performed in the framework of the standard quantum field theory. It was shown that the annihilation probability of the antibaryon in nuclei is strongly dependent on the effective masses of mesons involved in the annihilation channels. The contribution of the Dirac sea to the annihilation probability makes the lifetime of the antibaryon short. If the Dirac sea effect is neglected, the lifetime of the bound antibaryon tends to be longer with the nuclear density increasing. Particularly, when the nuclear density is larger than a critical value, the antibaryon may exist stably in a nucleus.