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基于AME2016发布的基态原子核质量数据, 分别从模型的精度及实验预言的中子新幻数两方面系统比较分析了八个普适核质量模型的可靠性及预言能力. 分区系统的计算了八个核质量模型预言的核质量均方根偏差, 分析发现对现有实验数据精确度较好的是Bhagwat和WS4两个模型. 通过分析中子壳能隙随中子数的变化趋势发现KTUY, WS3和WS4三个模型可以较好地再现中子新幻数N = 32引起的突变行为, 预言了在Cl和Ar同位素链中N = 32极有可能是新的幻数. 通过分析超重区域α衰变能随中子数的变化趋势发现FRDM12, WS3和WS4三个模型均可以较好地再现N = 152, 162的子壳现象, 且预言了对于质子数Z = 108—114同位素链在N = 184处原子核的寿命相对较长.The reliability and prediction ability of 8 global nuclear mass models is systematically analyzed in terms of the accuracy of the model and the new neutron magic number predicted by experiments based on the ground-state nuclear mass data from AME2016. The root-mean-square (RMS) deviations of nuclear mass predicted by 8 nuclear mass models are calculated by subregion, and find that the Bhagwat and WS4 models possess better accuracy to describe the existing experimental data. By analyzing the trend of the neutron shell energy gap varying with neutron number, it is found that the KTUY, WS3 and WS4 models can well represent the mutation behavior caused by the new magic number N = 32, and it is predicted that N = 32 is likely to be a new magic number in the Cl isotope chain and Ar isotope chain. By analyzing the variation trend of α decay energy in the superheavy region, it is found that the FRDM12, WS3 and WS4 models can reproduce the phenomena of subshell with N = 152 and N = 162 well, and predict the relatively long life of nuclei at the neutron number N = 184 for the isotope chain with proton number Z = 108—114. The comprehensive analysis shows that the mass model with good accuracy cannot reproduce shell evolution behavior. For example, the Bhagwat model has the same accuracy as the WS4 model, but it cannot reproduce the mutation behavior of the new magic number N = 32, 152 and 162. But the KTUY model and FRDM12 model can reproduce the new magic number behavior of N = 32, 152 and 162, respectively, although the RMS deviation is slightly larger. The RMS deviation of WS4 model is small and can describe the shell evolution behavior in the nuclear mass well.
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Keywords:
- nuclear mass model /
- root-mean-square deviation /
- new magic number
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图 1 八个核质量模型对轻核(8 ≤ Z < 28)、中等-I(28 ≤ Z < 50)、中等-II(50 ≤ Z < 82)、重核(82 ≤ Z < 100)以及超重(Z ≥ 100>)五个区域质量描述的均方根偏差
Fig. 1. Root-mean-square deviations of the mass of light (8 ≤ Z < 28), medium-I (28 ≤ Z < 50), medium-II (50 ≤ Z < 82), heavy (82 ≤ Z < 100), and super-heavy (Z ≥ 100) are calculated by the 8 nuclear mass models.
表 1 八个核质量模型的基态质量、单中子分离能、单质子分离能、双中子分离能及双质子分离能的均方根偏差
Table 1. Root-mean-square deviations of the ground state mass, single-neutron separation energy, single-proton separation energy, two-neutron separation energy and two-proton separation energy of the 8 nuclear mass models.
模型 M/MeV Sn/MeV Sp/MeV S2n/MeV S2p/MeV KTUY 0.724 0.306 0.367 0.383 0.527 FRDM12 0.599 0.351 0.368 0.455 0.469 HFB27 0.517 0.424 0.446 0.423 0.464 DZ31 0.422 0.290 0.307 0.342 0.379 INM12 0.381 0.372 0.369 0.375 0.386 WS3 0.343 0.274 0.302 0.296 0.358 WS4 0.302 0.260 0.278 0.276 0.326 Bhagwat 0.301 0.282 0.296 0.306 0.329 -
[1] Roubin A, Atanasov D, Blaum K, George S, Herfurth F, Kisler D, Kowalska M, Kreim S, Lunney D, Manea V, Minaya Ramirez E, Mougeot M, Neidherr D, Rosenbusch M, Schweikhard L, Welker A, Wienholtz F, Wolf R N, Zuber K 2017 Phys. Rev. C 96 014310
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Google Scholar
[13] Ramirez E M, Ackermann D, Blaum K, Block M, Droese C, Düllmann C E, Dworschak M, Eibach M, Eliseev S, Haettner E, Herfurth F, Heßberger F P, Hofmann S, Ketelaer J, Marx G, Mazzocco M, Nesterenko D, Novikov Y N, Plaß W R, Rodríguez D, Scheidenberger C, Schweikhard L, Thirolf P G, Weber C 2012 Science 337 1207
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Google Scholar
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Google Scholar
Zhou S G 2017 Nucl. Phys. Rev. 34 318
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[22] 李竹, 孙保华, 孟杰 2013 物理 42 505
Li Z, Sun B H, Meng J 2013 Physics 42 505
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