Multidimensionally constrained relativistic Hartree-Bogoliubov study of spontaneous nuclear fission
文献类型：期刊论文
| 作者 | Zhao, J; Lu, BN; Niksic, T; Vretenar, D |
| 刊名 | PHYSICAL REVIEW C
 |
| 出版日期 | 2015 |
| 卷号 | 92期号:6页码:64315 |
| 通讯作者 | Zhao, J (reprint author), Univ Zagreb, Fac Sci, Dept Phys, Bijenicka 32, Zagreb 10000, Croatia. |
| 合作状况 | 国际 |
| 英文摘要 | Background: Recent microscopic studies, based on the theoretical framework of nuclear energy density functionals, have analyzed dynamic (least action) and static (minimum energy) fission paths, and it has been shown that in addition to the important role played by nonaxial and/or octupole collective degrees of freedom, fission paths crucially depend on the approximations adopted in calculating the collective inertia. Purpose: To analyze effects of triaxial and octupole deformations, as well as approximations to the collective inertia, on the symmetric and asymmetric spontaneous fission dynamics, and compare with results of recent studies based on the self-consistent Hartree-Fock-Bogoliubov (HFB) method. Methods: Deformation energy surfaces, collective potentials, and perturbative and nonperturbative cranking collective inertia tensors are calculated using the multidimensionally-constrained relativistic Hartree-Bogoliubov (MDC-RHB) model, with the energy density functionals PC-PK1 and DD-PC1. Pairing correlations are treated in the Bogoliubov approximation using a separable pairing force of finite range. The least-action principle is employed to determine dynamic spontaneous fission paths. Results: The dynamics of spontaneous fission of Fm-264 and Fm-250 is explored. The fission paths, action integrals, and the corresponding half-lives predicted by the functionals PC-PK1 and DD-PC1 are compared and, in the case of Fm-264, discussed in relation with recent results obtained using the HFB model based on the Skyrme functional SkM* and a density dependent mixed pairing interaction. Conclusions: The inclusion of nonaxial quadrupole and octupole shape degrees of freedom is essential for a quantitative analysis of fission dynamics. The action integrals and, consequently, the half-lives crucially depend on the approximation used to calculate the effective collective inertia along the fission path. The perturbative cranking approach underestimates the effects of structural changes at the level crossings and the resulting collective inertia varies relatively smoothly in the (beta(20), beta(22)) and (beta(20), beta(30)) planes. In contrast, the nonperturbative collective mass is characterized by the occurrence of sharp peaks on the surface of collective coordinates, that can be related to single-particle level crossings near the Fermi surface. This enhances the effective inertia, increases the values of the action integral, and results in longer fission half-lives. |
| 学科主题 | Physics |
| 类目[WOS] | Physics, Nuclear |
| 关键词[WOS] | SUPERHEAVY NUCLEI ; COLLECTIVE MOTION ; MASS PARAMETERS ; HALF-LIVES ; FOCK APPROXIMATION ; PAIRING VIBRATIONS ; DYNAMICS ; HEAVY ; BARRIERS ; MODE |
| 收录类别 | SCI |
| 语种 | 英语 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/21246]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 计算平台成果 |
| 推荐引用方式 GB/T 7714 | Zhao, J,Lu, BN,Niksic, T,et al. Multidimensionally constrained relativistic Hartree-Bogoliubov study of spontaneous nuclear fission[J]. PHYSICAL REVIEW C,2015,92(6):64315. |
| APA | Zhao, J,Lu, BN,Niksic, T,&Vretenar, D.(2015).Multidimensionally constrained relativistic Hartree-Bogoliubov study of spontaneous nuclear fission.PHYSICAL REVIEW C,92(6),64315. |
| MLA | Zhao, J,et al."Multidimensionally constrained relativistic Hartree-Bogoliubov study of spontaneous nuclear fission".PHYSICAL REVIEW C 92.6(2015):64315. |
入库方式： OAI收割
来源：理论物理研究所
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