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理论预测超重核274-291Cn和266-287Ds的衰变模式
Theoretical Descriptions of Decay Modes in 274-291Cn and 266-287Ds Superheavy Nuclei
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摘要: 自发裂变和α衰变是影响超重核稳定性的两个主要因素.为了探索270Ds 附近的长寿命的超重核,系统地计算了电荷数在104≤Z≤112 范围内的α衰变与自发裂变之间的竞争.采用推广的液滴模型和唯象的解析公式计算了α衰变半衰期.基于包括壳效应和同位旋效应的WKB近似方法估算了相同超重核的自发裂变半衰期,进而预测了未知超重核274-276,279Cn与267-269Ds的衰变模式.Abstract: The stability of superheavy nuclei (SHN) is controlled mainly by spontaneous fission and decay processes. To investigate whether long lived SHN could really exist around 270Ds, the competition between α decay and spontaneous fission in the region 104≤Z≤112 are studied systematically. The α decay half-lives are investigated by employing a generalized liquid drop model (GLDM) and phenomenological analytical formula. Calculations of spontaneous fission half-lives for the same SHN are carried out based on the Wenzel-Kramers-Brillouin(WKB) approximation with both the shell effect and the isospin effect included. Decay modes are predicted for the unknown nuclei 274-276,279Cn and 267-269Ds.
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