Microscopic self-consistent description of induced fission dynamics: Finite-temperature effects
文献类型：期刊论文
| 作者 | Zhao, J7; Niksic, T1; Vretenar, D1; Zhou, SG
|
| 刊名 | PHYSICAL REVIEW C
 |
| 出版日期 | 2019 |
| 卷号 | 99期号:1页码:14618 |
| 关键词 | HARTREE-BOGOLIUBOV THEORY ENERGIES BARRIER NUCLEI PU-240 |
| ISSN号 | 2469-9985 |
| DOI | 10.1103/PhysRevC.99.014618 |
| 英文摘要 | The dynamics of induced fission of Th-226 is investigated in a theoretical framework based on the finite-temperature time-dependent generator coordinate method (TDGCM) in the Gaussian overlap approximation (GOA). The thermodynamical collective potential and inertia tensor at temperatures in the interval T = 0-1.25 MeV are calculated using the self-consistent multidimensionally constrained relativistic mean-field (MDC-RMF) model, based on the energy density functional DD-PC1. Pairing correlations are treated in the BCS approximation with a separable pairing force of finite range. Constrained RMF+BCS calculations are carried out in the collective space of axially symmetric quadrupole and octupole deformations for the asymmetric fissioning nucleus( 226)Th. The collective Hamiltonian is determined by the temperature-dependent free energy surface and perturbative cranking inertia tensor, and the TDGCM+GOA is used to propagate the initial collective state in time. The resulting charge and mass fragment distributions are analyzed as functions of the internal excitation energy. The model can qualitatively reproduce the empirical triple-humped structure of the fission charge and mass distributions already at T = 0, but the precise experimental position of the asymmetric peaks and the symmetric-fission yield can only be accurately reproduced when the potential and inertia tensor of the collective Hamiltonian are determined at finite temperature, in this particular case between T = 0.75 MeV and T = 1 MeV. |
| 学科主题 | Physics |
| 语种 | 英语 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/23503]  |
| 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 |
| 作者单位 | 1.China Acad Engn Phys, Inst Elect Engn, Chengdu 610200, Sichuan, Peoples R China 2.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China 3.Univ Zagreb, Fac Sci, Phys Dept, Bijenicka Cesta 32, Zagreb 10000, Croatia 4.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China 5.Natl Lab Heavy Ion Accelerator, Ctr Theoret Nucl Phys, Lanzhou 730000, Gansu, Peoples R China 6.Hunan Normal Univ, Synerget Innovat Ctr Quantum Effects & Applicat, Changsha 410081, Hunan, Peoples R China 7.China Acad Engn Phys, Microsyst & Terahertz Res Ctr, Chengdu 610200, Sichuan, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao, J,Niksic, T,Vretenar, D,et al. Microscopic self-consistent description of induced fission dynamics: Finite-temperature effects[J]. PHYSICAL REVIEW C,2019,99(1):14618. |
| APA | Zhao, J,Niksic, T,Vretenar, D,&Zhou, SG.(2019).Microscopic self-consistent description of induced fission dynamics: Finite-temperature effects.PHYSICAL REVIEW C,99(1),14618. |
| MLA | Zhao, J,et al."Microscopic self-consistent description of induced fission dynamics: Finite-temperature effects".PHYSICAL REVIEW C 99.1(2019):14618. |
入库方式： OAI收割
来源：理论物理研究所
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