The discovery of the triaxial superdeformed bands provide a new opportunity to understand the axial symmetry breaking even in highly elongated nuclei. A total of 17 triaxial superdeformed nuclei in the mass A ~ 160 re...The discovery of the triaxial superdeformed bands provide a new opportunity to understand the axial symmetry breaking even in highly elongated nuclei. A total of 17 triaxial superdeformed nuclei in the mass A ~ 160 region and 11 in the mass A ~ 80 region are predicted by the three dimensional total routhian surface calculations. A possible way to identify the triaxiality of triaxial superdeformed nuclei is suggested.展开更多
The properties of the high spin states of the neutron-rich 98-102Sr and 100-104Zr isotopes have been studiedusing the projected shell model.In particular,the upbending phenomenon is investigated for these isotopes alo...The properties of the high spin states of the neutron-rich 98-102Sr and 100-104Zr isotopes have been studiedusing the projected shell model.In particular,the upbending phenomenon is investigated for these isotopes along theyrast line.The results show that the occurrence of upbending phenomenon is attributed to the band crossing betweenground state band and 2-qp neutron band having configuration 2vh11/2[-3/2,5/2],K = 1.Furthermore,the neutrontwo-quasi-partieie structure of side bands in 98Sr and 102Zr is discussed in this paper.展开更多
Three-dimensional total Routhian surface calculations are carried out to determine the triaxial superdeformation of odd-odd nucleus ^168Lu. One of the new four rotational bands observed in the experiment is identified...Three-dimensional total Routhian surface calculations are carried out to determine the triaxial superdeformation of odd-odd nucleus ^168Lu. One of the new four rotational bands observed in the experiment is identified as a triaxial superdeformed band, in which the neutron shell correction energy plays a key role and the deformationdriving effect of high j intruder orbital plays an additional role in the formation of triaxial superdeformation shape. Its deformation parameters (ε2, ε4, γ) are derived from the analysis, which can reproduce the experimental assignment.展开更多
The distribution of the reflection power ratio for a neutron or x-ray diffracted from a cylindrical crystal immersed in an homogenous incident beam is obtained by the numerical solution of the transfer equations for t...The distribution of the reflection power ratio for a neutron or x-ray diffracted from a cylindrical crystal immersed in an homogenous incident beam is obtained by the numerical solution of the transfer equations for the first time.The profile well reflects all the physical properties of the absorption and extinction behaviour in the crystals.A systematic investigation of the secondary extinction for cylindrical and spherical crystals was carried out based on these results.展开更多
High spin states of the odd-proton nucleus ^(167)Lu have been studied via ^(152)Sm(^(19)F,4n)^(167)Lu reaction at 87MeV beam energy.A weakly populated new rotationa1 band has been observed and assigned as i13/2 proton...High spin states of the odd-proton nucleus ^(167)Lu have been studied via ^(152)Sm(^(19)F,4n)^(167)Lu reaction at 87MeV beam energy.A weakly populated new rotationa1 band has been observed and assigned as i13/2 proton 1/2^(+)[660] band.This new band and the 1/2^(+)[660] band in ^(171)Ta from the early work are classified as superdeformed bands with triaxiality.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos.19975062,19835010 and 19935030.
文摘The discovery of the triaxial superdeformed bands provide a new opportunity to understand the axial symmetry breaking even in highly elongated nuclei. A total of 17 triaxial superdeformed nuclei in the mass A ~ 160 region and 11 in the mass A ~ 80 region are predicted by the three dimensional total routhian surface calculations. A possible way to identify the triaxiality of triaxial superdeformed nuclei is suggested.
基金Supported by the Natural Science Foundation of China under Grant Nos. 10975051, 10979024, 10905021the Natural Science Foundation of Zhejiang province, China under Grant No. Y6090210the Natural Science Foundation of Huzhou under Grant No. 2010YZll
文摘The properties of the high spin states of the neutron-rich 98-102Sr and 100-104Zr isotopes have been studiedusing the projected shell model.In particular,the upbending phenomenon is investigated for these isotopes along theyrast line.The results show that the occurrence of upbending phenomenon is attributed to the band crossing betweenground state band and 2-qp neutron band having configuration 2vh11/2[-3/2,5/2],K = 1.Furthermore,the neutrontwo-quasi-partieie structure of side bands in 98Sr and 102Zr is discussed in this paper.
文摘Three-dimensional total Routhian surface calculations are carried out to determine the triaxial superdeformation of odd-odd nucleus ^168Lu. One of the new four rotational bands observed in the experiment is identified as a triaxial superdeformed band, in which the neutron shell correction energy plays a key role and the deformationdriving effect of high j intruder orbital plays an additional role in the formation of triaxial superdeformation shape. Its deformation parameters (ε2, ε4, γ) are derived from the analysis, which can reproduce the experimental assignment.
基金Supported by the National Natural Science Foundation of China under Grant Nos.19974021 and 19975062Science Foundation of Nuclear Industry of China under Grant No.Y7197B9601.
文摘The distribution of the reflection power ratio for a neutron or x-ray diffracted from a cylindrical crystal immersed in an homogenous incident beam is obtained by the numerical solution of the transfer equations for the first time.The profile well reflects all the physical properties of the absorption and extinction behaviour in the crystals.A systematic investigation of the secondary extinction for cylindrical and spherical crystals was carried out based on these results.
基金Supported by the National Natural Science Foundation of Chinathe Science Foundation of Nuclear Industry of China.
文摘High spin states of the odd-proton nucleus ^(167)Lu have been studied via ^(152)Sm(^(19)F,4n)^(167)Lu reaction at 87MeV beam energy.A weakly populated new rotationa1 band has been observed and assigned as i13/2 proton 1/2^(+)[660] band.This new band and the 1/2^(+)[660] band in ^(171)Ta from the early work are classified as superdeformed bands with triaxiality.
