Complex shape effects in nuclear rotational spectra

Physics of Atomic Nuclei - Tập 67 - Trang 1760-1765 - 2004
N. Minkov1,2, S. B. Drenska1, P. Yotov1, W. Scheid2
1Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Sofia, Bulgaria
2Institut für Theoretische Physik der Justus-Liebig-Universität, Giessen, Germany

Tóm tắt

We study the evolution of collectivity in the structure of nuclear rotational bands based on complex quadrupole-octupole shapes. We apply an extended version of a quadrupole-octupole rotation model capable of reproducing both the low-lying states of alternating parity bands interpreted on the basis of octupole vibrations and the higher spin states considered as members of a single octupole rotational band. In such a way, the complicated odd-even staggering effects observed in light actinide nuclei are described successfully. The implemented model analysis suggests a unified mechanism in which the octupole band structure is formed as the result of the transition from an octupole vibration (soft) mode to a rotation of a shape with a stable quadrupole-octupole deformation.

Tài liệu tham khảo

N. Minkov, S. Drenska, P. Raychev, et al., Phys. Rev. C 63, 044305 (2001). N. Minkov and S. Drenska, Prog. Theor. Phys. Suppl. 146, 597 (2002). N. Minkov, S. Drenska, and P. Yotov, in Proceedings of the 21st International Workshop on Nuclear Theory, Rila, Bulgaria, 2002, Ed. by V. Nikolaev (Heron, Sofia, 2002), p. 290. D. Bonatsos et al., Phys. Rev. C 62, 024301 (2000). J. F. C. Cocks et al., Phys. Rev. Lett. 78, 2920 (1997); A. Artna-Cohen, Nucl. Data Sheets 80, 227 (1997); Y. A. Akovali, Nucl. Data Sheets 77, 433 (1996). G. A. Leander et al., Nucl. Phys. A 388, 452 (1982). D. Bonatsos et al., in Algebraic Methods in Nuclear Theory, Ed. by A. Antonov (Heron, Sofia, 2002), p. 89.