The Cd puzzle implies that the phonon excitation of a spherical nucleus should be questioned and refuted.To understand the newly and experimentally discovered spherical-like γ-soft mode,the SU3-IBM was recently propo...The Cd puzzle implies that the phonon excitation of a spherical nucleus should be questioned and refuted.To understand the newly and experimentally discovered spherical-like γ-soft mode,the SU3-IBM was recently proposed In this study,the evolutions ofthe normal states in ^(108-120)Cd are investigated and compared with the experimental results.To better explain the nearly zero B(E2)values between the O_(2)^(+) and 2_(1)^(+) states,SU(3)higherorder interactions except for the SU(3)second-order and third-order Casimir operators are also considered in detail.We find that the results of theoretical fitting and experimental data agree well with simple parameter selection,and the spherical-like spectra truly exist.The deficiency may arise from the lack of configuration mixing.The realistic spectra characteristicsof thespherical-like spectrare found for ^(118,120)Cd,and the electricquadrupole moments of the 2_(1)^(+) state are predicted.The Q2_(1)^(+)anomaly in ^(108-116)Cd is also discussed.展开更多
Recently,studies have argued that a spherical-like spectrum emerges in the SU3-IBM,thus creating new approaches to understanding y-softness in realistic nuclei.In a previous study,γ-softness with degeneracy of the gr...Recently,studies have argued that a spherical-like spectrum emerges in the SU3-IBM,thus creating new approaches to understanding y-softness in realistic nuclei.In a previous study,γ-softness with degeneracy of the ground and quasi-y bands was observed.In this paper,another special point connected to the middle degenerate point is discussed.It is found to be related to the properties of^(196)Pt.This emergentγ-softness is also shown to be important for understanding the prolate-oblate asymmetric shape phase transition.The low-lying spectra,B(E2)values,and quadrupole moments in^(196)Pt are discussed,and we show that the new model can account for several observed features.This is the first part of the discussion on theγ-soft-like spectrum of^(196)Pt.展开更多
The concept of"SU(3)analysis"is proposed for the B(E2)anomaly based on various mechanisms reported recently.The B(E2)anomaly is analyzed in the SU(3)symmetry limit.According to the results of the analysis,th...The concept of"SU(3)analysis"is proposed for the B(E2)anomaly based on various mechanisms reported recently.The B(E2)anomaly is analyzed in the SU(3)symmetry limit.According to the results of the analysis,the SU(3)third-order interaction[L×Q×L]^((0))can generate the level-crossing phenomenon for any mechanism,which is vital for the emergence of the B(E2)anomaly.Thus,this anomaly is found to be related with the SU(3)symmetry.The B(E2)anomaly in ^(168)Os is also analyzed.展开更多
基金Supported by the Educational Department of Jilin Province,China(JJKH20210526KJ)supported by the National Natural Science Foundation of China(11875158)。
文摘The Cd puzzle implies that the phonon excitation of a spherical nucleus should be questioned and refuted.To understand the newly and experimentally discovered spherical-like γ-soft mode,the SU3-IBM was recently proposed In this study,the evolutions ofthe normal states in ^(108-120)Cd are investigated and compared with the experimental results.To better explain the nearly zero B(E2)values between the O_(2)^(+) and 2_(1)^(+) states,SU(3)higherorder interactions except for the SU(3)second-order and third-order Casimir operators are also considered in detail.We find that the results of theoretical fitting and experimental data agree well with simple parameter selection,and the spherical-like spectra truly exist.The deficiency may arise from the lack of configuration mixing.The realistic spectra characteristicsof thespherical-like spectrare found for ^(118,120)Cd,and the electricquadrupole moments of the 2_(1)^(+) state are predicted.The Q2_(1)^(+)anomaly in ^(108-116)Cd is also discussed.
基金supported by the Educational Department of Jilin Province,China(JJKH20210526KJ)support from the Project Supported by Scientific Research Fund of Hunan University of Art and Science(23ZZ04)。
文摘Recently,studies have argued that a spherical-like spectrum emerges in the SU3-IBM,thus creating new approaches to understanding y-softness in realistic nuclei.In a previous study,γ-softness with degeneracy of the ground and quasi-y bands was observed.In this paper,another special point connected to the middle degenerate point is discussed.It is found to be related to the properties of^(196)Pt.This emergentγ-softness is also shown to be important for understanding the prolate-oblate asymmetric shape phase transition.The low-lying spectra,B(E2)values,and quadrupole moments in^(196)Pt are discussed,and we show that the new model can account for several observed features.This is the first part of the discussion on theγ-soft-like spectrum of^(196)Pt.
文摘The concept of"SU(3)analysis"is proposed for the B(E2)anomaly based on various mechanisms reported recently.The B(E2)anomaly is analyzed in the SU(3)symmetry limit.According to the results of the analysis,the SU(3)third-order interaction[L×Q×L]^((0))can generate the level-crossing phenomenon for any mechanism,which is vital for the emergence of the B(E2)anomaly.Thus,this anomaly is found to be related with the SU(3)symmetry.The B(E2)anomaly in ^(168)Os is also analyzed.
