Tetrahedral Symmetry in Superheavy Nuclei  

作　　者：CHEN Yong-shou, GAO Zao-chun 

出　　处：《Annual Report of China Institute of Atomic Energy》2007年第1期81-83,共3页中国原子能科学研究院年报（英文版）

基　　金：National Natural Science Foundation of China (10475115, 10305019, 10435010);Chinese Major State Basic Research Development Program (2007CB815000)

摘　　要：The issue that underlies the present investigation is whether some heaviest atomic nuclei can be characterized as having the intrinsic mean fields with the tetrahedral symmetry which is quite commonThe issue that underlies the present investigation is whether some heaviest atomic nuclei can be characterized as having the intrinsic mean fields with the tetrahedral symmetry which is quite common in molecular, metallic clusters and other many quantum objects. The tetrahedral symmetry is a direct consequence of the theory of the point group and corresponds to the invariance under the transformations of the group Td^D which has two one- and one four-dimensional irreducible representation. In molecular and metallic clusters, the tetrahedral symmetry is determined by the mutual geometric arrangement of the constituent ions. In atomic nuclei, as a strong interaction and finite many body systems, the situation is more complicated and the nuclear shape is governed by the shell effects. The tetrahedral symmetry in nuclei has been a subject of great interest, e.g., sees Ref. [1]. The theoretical prediction for the tetrahedral deformation in nuclei is rather convincing, however, it has not been confirmed experimentally. The tetrahedral symmetry in nuclei is realized at first order through the nonaxial octupole deformations of the nuclear density corresponding to the intrinsic moment Q32, associated with the Y32 deformed shape. Moreover, the octupole correlations and quadrupole mode are often in competition, so that the manifestation of the tetrahedral symmetry is somewhat obscurant. The present study will concentrate on the possibility that the tetrahedral symmetry may realize as the exotic Y32 shape in some superheavy nuclei, where the possible experimental evidences have already been implied in the new spectroscopy data. The purpose of the present article is to investigate for the first time the role of the nonaxial octupole configurations in the collective excitations of superheavy nuclei.

关 键 词：核物理学 超重核 四面体对称性 对称场 

分 类 号：O571[理学—粒子物理与原子核物理]