Interplay between the freedoms of intrisic deformations and tilting angles of rotationaxis at highspin states of atomic nuclei
Project/Area Number  12640281 
Research Category 
GrantinAid for Scientific Research (C)

Allocation Type  Singleyear Grants 
Section  一般 
Research Field 
素粒子・核・宇宙線

Research Institution  KYUSHU UNIVERSITY 
Principal Investigator 
SHIMIZU Yoshihumi Faculty of Sciences, KYUSHU UNIVERSITY Ass. Prof., 大学院・理学研究院, 助教授 (90187469)

Project Period (FY) 
2000 – 2001

Project Status 
Completed(Fiscal Year 2001)

Budget Amount *help 
¥2,300,000 (Direct Cost : ¥2,300,000)
Fiscal Year 2001 : ¥1,100,000 (Direct Cost : ¥1,100,000)
Fiscal Year 2000 : ¥1,200,000 (Direct Cost : ¥1,200,000)

Keywords  rapidly rotating nuclei / shape coexistence / superdeformed states / cranking model / tilted axis cranking / collective coordinate / collective mass tensor 
Research Abstract 
The main purpose of this research work is to study the interplay between the deformation and rotation degrees of freedom by using the collective coordinate method. Especially, the interplay between the quadrupole deformation and the tilting of rotationaxis is expected to be important for the understanding the nuclear structure of rapidly rotating nuclei from a microscopic viewpoint. In these two year's of research, we have accomplished several important achievements, but still there are some parts which remains to be finished. The final goal to calculate the collective wave function in high accuracy by solving the basic equation of the collective coordinate method is under investigation; especially, there is still a difficulty to perform the calculation in the case to treat the rotational degrees of freedom selfconsistently. Here we summarize what we have achieved: l) A efficient and highspeed method to calculate the RPA correlation energy, and using this method it becomes possible to
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obtain a good realistic potential energy surface. 2) As a effective interaction, the quadrupole pairing force is extremely important for rotational degrees of freedom. We have developed a method to construct the diabatic quasiparticle basis including this force, and it is proved to be very useful for the calculation of rotational potential energy. 3) By utilizing the dynamic tunneling method to the deformation degrees of freedom, we have developed a general theoretical framework to treat the decay of the highspin isomers and of the superdeformed rotational bands, and found that the framework can be applicable to many realistic situations. 4) As for the tilting degrees of freedom for the rotationaxis, the tilted axis cranking method within the meanfield treatment is very useful as a zeroorder approximation, and as an example, we have found that it is able to describe the onequasiparticle stronglycoupled rotational band in realistic nuclei. 5) In the case that the rotationaxis does not deviate very much from the principalaxis of deformation, we have checked that the RPA treatment of tilting axis can be applicable to investigate the recently observed nuclear wobbling motion excited on the triaxial superdeformed rotational band from a microscopic viewpoint. Less

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(18results)











[Publications] T. Shizuma, K. Matsuura, Y. Toh, T. Hayakawa, M. Oshima, Y. Hatsukawa, M. Matsuda, K. Furuno, Y. Sasaki, T. Komatsubara, and Y. R. Shimizu: "MultiQuasiparticle States and KForbidden Transitions in 183Os"Nuclear Physics. Vol. A696, No. 12 December. 337370 (2001)
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