Energy Staggering In Nuclear Magnetic Rotational Bands

Rotation is a common phenomenon in nature.As a finite quantum many-body system,nuclei exhibit many interesting phenomena.Based on a lot of experiments,A.Bohr and B.R.Mottelson explained the rotating phenomenon of nucleus firstly,and the rotating phenomenon is thought of the result of the large deformation of nuclear nuclei.Since 1970s,the high spin states of nuclei have become a new area in the study of the rotating phenomenon of nucleus.In the 1990s,different from the traditional high spin physics that based on the concept of electric multipole rotation,the magnetic rotation was proposed as a new mode of the rotating phenomenon of nucleus and confirmed by later experiments.Magnetic rotation has become a hot topic in high spin physics.To date,more than 200 magnetic dipole bands spread over 110nuclides have been observed in the mass regions of A?60,80,110,130,and 190 mass regions.In this paper,the systematics of energy staggering for the magnetic dipole bands with M1and E2 transition properties strictly consistent with the features of ideal magnetic rotation in these mass regions are presented.The regularity among these bands that energy staggering pa-rameter increases as spin increases has be shown,which is in agreement with the semiclassical description of shears mechanism.In addition,the abnormal behaviours in the backbend regions or close to band termination have been discussed.Taking the M1 bands with same configura-tion in three N=58 isotones,i.e.,¹⁰³Rh,¹⁰⁵Ag,and¹⁰⁷In as examples,the transition from chiral rotation to magnetic rotation with the proton number approaching Z=50 is presented.More-over,the self-consistent tilted axis cranking and principle axis cranking relativistic mean-field theories are applied to investigate the rotational mechanism in dipole band of¹⁰⁵Ag.