Magnetic rotation – past, present and future

Pramana

A K Jain1¹  Deepika Choudhury¹ 

[1] Department of Physics, Indian Institute of Technology, Roorkee 247 667, India$$

关键词: Magnetic rotation;    shears mechanism;    band crossing;    back bending;    signature splitting.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

Magnetic-dipole rotational (MR) bands were discovered about 15 years ago without any theoretical prediction in contrast to the super-deformed (SD) bands which were predicted long ago. First identification of a quasirotational structure as MR band occurred around 1992 although Kr isotopes probably have the first set of data having the signatures of MR bands as shown by us. Our first compilation of MR bands listed 120 MR bands in 56 nuclides which have now grown to more than 180 bands in 80 nuclides. We have observed new MR bands in the 𝐴 = 130 mass region in 137Pr,139Nd and 135Ba nuclei. This led to the observation of the smallest MR bands in 137Pr, multiple minima in the 𝛾 deformation in 135Ba, coexistence of band structure based on these minima and band crossing of MR bands in 𝐴 = 130 region. Some of these results have been reviewed in this paper along with theoretical calculations. There are still a number of questions related to MR bands which have not been fully resolved. The role of neutrons/protons in magnetic rotation still needs to be delineated. Do the MR bands follow the 𝐼(𝐼 + 1) behaviour? Are these structures as regular as normal rotational bands? How important is the existence of deformation for MR bands? We address some of these questions in this paper.

【 授权许可】

Unknown