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Properties of Very Hot Nuclei from Heavy-Ion Reactions at Intermediate Energies

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Chinese Physics Letters 1997年第4期14卷 266-269页

作者： ZHENG Yu-ming SA Ben-hao WANG Hui china institute of atomic energy Beijing 102413

The liquid-gas phase transition from heavy-ion reactions at intermediate energies has been studied in the incomplete-fusion-fragmentation *** relative yields of decay modes of the projectile remnant are also analyzed and compared with the experimental *** experimental results are nicely described by the incomplete-fusion-fragmentation model.

关键词： incomplete fragmentation decay

A study of U-isotope ground state properties with covariant energy density functional

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Chinese Physics C 2024年第6期48卷 130-135页

作者：王俊辰田源续瑞瑞崔莹陶曦孙小东张智张玥韩银录葛智刚舒能川 china Nuclear Data Center China Institute of Atomic EnergyBeijing 102413China china institute of atomic energy Beijing 102413China

In this study,we systematically analyzed the ground state of uranium isotopes from 225 to *** our calculations,we used the covariant energy density functional of density-dependent meson exchange interaction(DDME2)with separable pairing interaction(TMR).Using the multiple deformation constraint,we calculated the potential energy surface(PES)of the uranium isotopes for both even-even and even-odd nuclei with quadrupole and octupole *** on our calculation and upon comparing the experimental data and Hartree-Fock-Bogoliubov calculations with Gogny D1S calculation data,the ground state of uranium isotopes with reflection-asymmetric deformation was found to be preferred.

关键词： relativistic mean field density functional theory octupole deformation

A Sensitivity Test of Extracting the Optical Potential Parameters for 6He＋209Bi from the Transfer Reaction 208pb（7Li,6He）209Bi

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Chinese Physics Letters 2014年第9期31卷 40-43页

作者：吴振东杨磊林承键贾会明杨峰徐新星张焕乔刘祖华包鹏飞孙立杰马南茹郑垒 china institute of atomic energy Beijing 102413

Recently, an indirect method has been proposed to study the optical model potential of exotic nuclear systems by fitting the transfer reaction angular distribution. The sensitivity test of this transfer method is performed with 2~8 pb（T Li,6 He）2~9 Bi as an example, by varying the potential parameters individually. The results indicate that, except for the ambiguity in the real potential depth V, other optical potential parameters of 6He＋209Bi as well as the structural information of the reactions can be extracted reliably, Moreover, the radius parameter of the bound state, rbound, is an extraordinarily sensitive parameter, which should be taken care of in the calculation procedure. The present work provides a theoretical reference for the application of the transfer method.

关键词： ANGULAR distribution (Nuclear physics) RESEARCH BOUND states (Quantum mechanics) NUCLEAR reactions NUCLEAR energy -- Research NUCLEAR physics

Equation of State for Isospin Asymmetric Matter of Nucleons and Deltas

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Chinese Physics Letters 2008年第11期25卷 3932-3935页

作者：卢晓华张英逊李祝霞赵志祥 china institute of atomic energy Beijing 102413

An investigation on the equation of state of the isospin asymmetric, hot, dense matter of nucleons and deltas is performed based on the relativistic mean field theory. The QHD-Ⅱ-type effective Lagrangian extending to the delta degree of freedom is adopted. Our re,sults show that the equation of state is softened due to the inclusion of the delta degree of freedom. The baryon resonance isomer may occur depending on the delta-meson coupling. The results show that the densities for appearing the baryon resonance isomer, the densities for starting softening the equation of state and the extent of the softening depend not only on the temperature, the coupling strengths but also the isospin asymmetry of the baryon matter.

关键词： the power-law exponents precipitation durative abrupt precipitation change

Correction of the Directional Correlation of Oriented Nuclei for Detector Efficiency

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Chinese Physics Letters 1999年第11期16卷 796-797页

作者： LI Guang-sheng china institute of atomic energy Beijing 102413

Correction of the directional correlation of oriented nuclei for detector efficiency has been investigated by using in-beam γ-ray spectroscopic method. The result indicates that this correction is quite necessary for the low-energy γ-rays. On the basis of the corrected directional correlation of oriented nuclei ratios the spin assignment of the new rotational band for 170Hf was yielded.

关键词： method. directional correction

Collective Behavior of Negative Parity States in ^(126)Ba at High Spin

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Chinese Physics Letters 1998年第3期15卷 168-169页

作者： LI Guang-sheng DAI Zheng-yu LIU Xiang-an ZHANG Lan-kuan WEN Shu-xian WU Xiao-guang YUAN Guan-jun WENG Pei-kun LI Sheng-gang YANG Chun-xiang china institute of atomic energy Beijing 102413

Lifetimes of the high spin states in the negative parity band of ^(126)Ba were measured by using the Doppler shift attenuation method in conjunction with the reaction ^(116)Sn(^(16)O,2p4n)^(126) Ba at a beam energy of 73 *** band shows a typically collective behavior and possesses a near-axial prolate shape with a deformation parameter β_(2)=0.27±0.01 and triaxiality γ~-5°.

关键词： collective typically

Quadrupole Moment of the h_(11/2) Quasineutron Band in ^(129)Ce

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Chinese Physics Letters 1998年第8期15卷 564-565页

作者： LI Guang-sheng DAI Zheng-yu LIU Xiang-an ZHANG Lan-kuan WEN Shu-xian WU Xiao-guang YUAN Guan-jun WENG Pei-kun LI Sheng-gang YANG Chun-xiang china institute of atomic energy Beijing 102413

Mean lifetimes of the h_(11/2) quasineutron band in 129Ce were measured by using the Doppler shift attenuation method in connection with the reaction ^(116)Sn(^(l6)O,3n)^(129)Ce at a bombarding energy of *** data indicate that transition quadrupole moment of ^(129)Ce is smaller than that of *** reduction in collectivity caused by the addition of an h_(11/2) neutron can be interpreted as due to triaxiality induced byγdriving effect.

关键词： effect. addition

Halo-like Structures Observed in ^(209)Pb

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Chinese Physics Letters 2001年第8期18卷 1024-1026页

作者： LIU Zu-Hua china institute of atomic energy Beijing 102413

The density distributions of the last neutron in ^(209)Pb wereinvestigated by analysis of the ^(208)Pb(d,p)^(209)Pb transfer reactions at 8 *** results show that the last neutron in the 2d_(5/2),3s_(1/2),1g_(7/2) and 2d_(3/2) states is present with appreciable probability at distances much larger than the core ***,these states should be the neutron halo or skin ***,the density distributions extracted illustrate that there is intrinsic relationship between the node number of state and the halo formation.

关键词： formation. states. radius.

Spins of Triaxial Superdeformed Bands in ^(86)Zr

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Chinese Physics Letters 2000年第7期17卷 478-479页

作者： LIU Zu-hua YANG Chun-Xiang china institute of atomic energy Beijing 102413

Transition energies of three triaxial superdeformed bands in 86Zr were fitted by the power-series expansion of spin I in odd powers of rotationalfrequeney ψ and by the two-parameter expression for rotational spectra.... 详细信息

关键词： spectra bands rotational