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建立一种固相萃取(SPE)富集,超高效液相色谱-串联质谱法(UHPLC-MS/MS)检测水中6种痕量邻苯二甲酸酯类化合物[PAEs,包括邻苯二甲酸二(4-甲基-2-戊基)酯(BMPP)、邻苯二甲酸二己酯(DHXP)、邻苯二甲酸二环己酯(DCHP)、邻苯二甲酸二(2-丁氧基)乙酯(DBEP)、邻苯二甲酸二(2-乙基)己酯... 相似文献
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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. 相似文献