通过对磁多极场的分析,其对称性可分为两大类:一类是二、六、十、十四、…极场,另一类是四、八、十二、十六、…极场.根据磁多极场的对称性,导出了磁多极场磁感应三个分量的泰勒级数展开式,定义了磁多极场的场参数.结果表明,通过 y 轴上...通过对磁多极场的分析,其对称性可分为两大类:一类是二、六、十、十四、…极场,另一类是四、八、十二、十六、…极场.根据磁多极场的对称性,导出了磁多极场磁感应三个分量的泰勒级数展开式,定义了磁多极场的场参数.结果表明,通过 y 轴上 By 分量的数个参数,就可以近似计算得到整个空间的磁感应值.展开更多
The lifetimes for the states of magnetic dipole band in106Ag have been measured using the Doppler-shift attenuation method via the reaction of100Mo(11B,5n)106Ag at a beam energy of 60 MeV.The reduced transition streng...The lifetimes for the states of magnetic dipole band in106Ag have been measured using the Doppler-shift attenuation method via the reaction of100Mo(11B,5n)106Ag at a beam energy of 60 MeV.The reduced transition strengths of the magnetic dipole band,the B(M1)/B(E2)ratios together with the signature of the level energy as a function of angular momentum for the positive parity states of106Ag show that a drastic change of excitation mode,that is,from electric rotation to magnetic rotation,occurs within one unit of spin at around Iπ=12+.Theoretical calculations based on the triaxial projected shell model consistently reproduce the experimental data and provide an explanation on the nature of observed phenomena such that the dynamical drift of the rotational axis suddenly from the principal axis to the tilted one,along the positive parity bands of106Ag.展开更多
基金supported by the NationalNatural Science Foundation of China(Grant Nos.10975191,10775184,10775182,10675171,10575133,11021504,11175258 and 11275068)the Chinese Major State Basic Research Development Program(Grant No.2007CB815005)
文摘The lifetimes for the states of magnetic dipole band in106Ag have been measured using the Doppler-shift attenuation method via the reaction of100Mo(11B,5n)106Ag at a beam energy of 60 MeV.The reduced transition strengths of the magnetic dipole band,the B(M1)/B(E2)ratios together with the signature of the level energy as a function of angular momentum for the positive parity states of106Ag show that a drastic change of excitation mode,that is,from electric rotation to magnetic rotation,occurs within one unit of spin at around Iπ=12+.Theoretical calculations based on the triaxial projected shell model consistently reproduce the experimental data and provide an explanation on the nature of observed phenomena such that the dynamical drift of the rotational axis suddenly from the principal axis to the tilted one,along the positive parity bands of106Ag.
