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AbstractAbstract

[en] Using microscopic sdIBM-2+2q. p. approach, the levels of the ground-band, γ-band and two-quasi-particle band for

^{80}Kr nucleus are calculated. The data obtained show agreement with the recent experimental results. The model identifies that the 8_{1}^{+}state, 8_{2}^{+}state, and 8_{3}^{+}state maybe belong to the ground state band, quasi-neutron and quasi-proton band, respectively, while the 8_{4}^{+}state is a member of γ-band. The theoretical calculations indicate that no the distinct change of nuclear state is caused by the abrupt broken pair of a boson. The problem of the energy and the identification of two-quasi-particle band are discussed yetPrimary Subject

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Journal Article

Journal

Atomic Energy Science and Technology; ISSN 1000-6931; ; v. 37(3); p. 217-220

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AbstractAbstract

[en] By using a microscopic sdIBM-2+2q. p. approach which is the accomplishment of the phenomenological core plus two-quasi-particle model and the experimental single-particle energies, the levels of the ground-band, γ-band and partial two-quasi-particle states on even

^{80-86}Zr isotopes are successfully reproduced. The shape transition which transits from SU(3) symmetry to O(6) one, then to U(5) on for the isotopes is achieved. Based on the phenomenological model and microscopic approach, it has been deduced that no s-boson in the nucleus occupies breaking pair and aligning; and the minimum aligend energy required when one d-boson does is obtained. The threshold value explicitly indicates that along with the increase of neutron number, the evolvements from the two-quasi-proton states on^{80}Zr nucleus to the two-quasi-neutron states on^{86}Zr nucleus may take place in even Zr isotopes. (authors)Primary Subject

Source

1 figs., 3 tabs., 25 refs.

Record Type

Journal Article

Journal

Atomic Energy Science and Technology; ISSN 1000-6931; ; v. 38(6); p. 487-491

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BETA DECAY RADIOISOTOPES, BETA-PLUS DECAY RADIOISOTOPES, DEFORMATION, DYNAMICAL GROUPS, ELECTROMAGNETIC RADIATION, ELECTRON CAPTURE RADIOISOTOPES, ENERGY LEVELS, EVEN-EVEN NUCLEI, HOURS LIVING RADIOISOTOPES, INTERACTIONS, INTERMEDIATE MASS NUCLEI, IONIZING RADIATIONS, ISOTOPES, LIE GROUPS, MATHEMATICAL MODELS, MINUTES LIVING RADIOISOTOPES, NUCLEAR MODELS, NUCLEI, PARTICLE PRODUCTION, RADIATIONS, RADIOISOTOPES, SHELL MODELS, SU GROUPS, SYMMETRY GROUPS, U GROUPS, ZIRCONIUM ISOTOPES

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AbstractAbstract

[en] Using microscopic sdgIBM-F-bar

_{max}approach and procedure of canonical ensemble average, the finite temperature specific heat capacity of^{20}Ne is calculated. As there are peaks in the specific heat capacity, it is established that phase transition of thermal excitation mode is taken place. The order parameter of this phase transition is supposed to be boson energyPrimary Subject

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Journal Article

Journal

Atomic Energy Science and Technology; ISSN 1000-6931; ; v. 34(2); p. 156-160

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AbstractAbstract

[en] By using a microscopic sdIBM-2+2q

_{.}p_{.}approach which is the phenomenological core plus two-quasi-particle model and the experimental single-particle energies, the levels of the ground-band, β-band, γ-band, and partial two-quasi-particle states on^{64-68}Ge isotopes are successfully reproduced. Based on the phenomenological model and microscopic approach, it has been deduced that no s-boson in the nucleus is breaking up and aligning; and that when one d-boson does, the minimum aligned energy can be calculated. This paper explicitly indicates that, with the increase of neutron number, an evolution process of PPT objects, i.e. from the two-quasi-proton states (on^{64}Ge nucleus) to the two-quasi-neutron states (on^{68}Ge nucleus) may take place in even Ge isotopes. (authors)Primary Subject

Source

1 fig., 3 tabs., 29 refs.

Record Type

Journal Article

Journal

Nuclear Science and Techniques; ISSN 1001-8042; ; v. 15(5); p. 261-264

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BARYONS, BETA DECAY RADIOISOTOPES, BETA-PLUS DECAY RADIOISOTOPES, DAYS LIVING RADIOISOTOPES, ELECTRON CAPTURE RADIOISOTOPES, ELEMENTARY PARTICLES, ENERGY LEVELS, EVEN-EVEN NUCLEI, FERMIONS, GERMANIUM ISOTOPES, HADRONS, HOURS LIVING RADIOISOTOPES, INTERACTIONS, INTERMEDIATE MASS NUCLEI, ISOTOPES, MATHEMATICAL MODELS, MINUTES LIVING RADIOISOTOPES, NUCLEAR MODELS, NUCLEAR REACTIONS, NUCLEI, NUCLEONS, PARTICLE PRODUCTION, RADIOISOTOPES, SHELL MODELS, SPECTRA

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AbstractAbstract

[en] The authors study the ground state properties of even Dy isotopes, from the proton drip line to the neutron drip line, in the Relativistic Continuum Hartree-Bogoliubov theory with the NL-SH parameters. Firstly, our results show that theoretical binding energies and nuclear root mean square radii are in good agreement with the available experimental data. Secondly, the authors draw the following conclusions by investigating the calculated results: 1. within the neutron shell on N=82-126, there is an obvious sub-shell between the ranges of N=84-92 and N=94-126; 2. The predicted neutron drip line nucleus is

_{66}^{250}Dy_{184}; 3. characteristics of halos and giant halos appears in_{66}^{240-250}Dy_{174-184}nuclei, among which there may be the giant halos. (authors)Primary Subject

Source

10. conference on nuclear structure; Huaxi, Guizhou (China); 25-28 Jul 2004; 2 figs., 2 tabs., 22 refs.

Record Type

Journal Article

Literature Type

Conference

Journal

High Energy Physics and Nuclear Physics; ISSN 0254-3052; ; v. 28(Suppl.); p. 108-112

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AbstractAbstract

[en] Using microscopic core plus two-quasiparticle model, the ground-band, β-band, γ-band and partial high spins states at zero temperature in even

^{148-158}Sm isotopes are successfully reproduced, these values are coincident with recent experimental one. Under canonical ensemble theory, their finite temperature specific heat capacity is calculated. Seeing that the peak of specific heat capacity is the signal of phase transition, it is by means of this approach that the phase transition of model thermo-excited, one from the superfluid nuclear phase to the normal phase, and one from the deformed shape to the spherical shape taken place in nuclei may be described untidily. The aligned energy and the identity of two-quasiparticle are discussed, and then the thermal stability of nuclear shape is investigatedPrimary Subject

Record Type

Journal Article

Journal

Acta Physica Sinica; ISSN 1000-3290; ; v. 52(1); p. 42-47

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ALPHA DECAY RADIOISOTOPES, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, EVEN-EVEN NUCLEI, INTERMEDIATE MASS NUCLEI, ISOTOPES, MATHEMATICAL MODELS, MINUTES LIVING RADIOISOTOPES, NUCLEAR MODELS, NUCLEI, PHYSICAL PROPERTIES, RADIOISOTOPES, RARE EARTH NUCLEI, SAMARIUM ISOTOPES, STABLE ISOTOPES, THERMODYNAMIC PROPERTIES, YEARS LIVING RADIOISOTOPES

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AbstractAbstract

[en] By using the microscopic sdIBM-2 formalism, procedures of canonical ensemble average and saddle point method, the finite-temperature internal energy, specific heat and level density of nucleus were calculated. The temperature of the phase transition of thermal excitation mode was determined in reference to the single boson energy. As there is a peak in the specific heat, it is established that the symmetric phase transition takes place in the nucleus. For

^{56,58}Fe isotopes, numerical results were calculated and compared with the experimental data and the values obtained by quantum Monte Carlo calculations. The present results indicate that this approach can be successfully used in describing light nuclei and their finite-temperature behaviorPrimary Subject

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Journal Article

Journal

Nuclear Science and Techniques; ISSN 1001-8042; ; v. 12(1); p. 1-8

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AbstractAbstract

[en] Using a microscopic sdIBM-2+2q·p· approach, the spectra of the low-spin and partial high-spin states in

^{124}Te nucleus are relatively successfully calculated. In particular, the 1_{1}^{+}, 1_{2}^{+}, 3_{1}^{+}, 3_{2}^{+}and 5_{1}^{+}states are successfully reproduced, the energy relationship resulting from this approach identifies that the 6_{1}^{+}, 8_{1}^{+}and 10_{1}^{+}states belong to the aligned states of the two protons. This can explain the recent experimental results that the collective structures may coexist with the single-particle states. So this approach becomes a powerful tool for successfully describing the spectra of general nuclei without clear symmetry and of isotopes located at transitional regions. Finally, the aligned-state structure and the broken-pair energy of the two-quasi-particle are discussedPrimary Subject

Record Type

Journal Article

Journal

Acta Physica Sinica; ISSN 1000-3290; ; v. 53(3); p. 734-737

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AbstractAbstract

[en] Using the two kinds of excitation spectra of approach for the satisfactorily reproducing nuclear complex spectrum, this treatment revealed a new understanding of phase transitions as the basis state structure of original excitation mode and its advantages in energy were relieved by de-excitation, the basis state of high-ordered structure release energy, at the same time the basis state structure of the low-energy excitation mode was restructured, the transition between new basis state and old one was achieved. This kind of change is one that is completed by the adjustment of the nuclear coupling strength, and a dynamic microscopic fundament of the rotational driven quantum phase transition, which is a suave microscopically. This new understanding is obtained from theory of potential energy surfaces of the Bohr collective model. Thus, the results of micro-sdIBM-(F-bar)

_{max}are supported by the Bohr collective model. (authors)Primary Subject

Source

2 figs., 3 tabs., 24 refs.

Record Type

Journal Article

Journal

Atomic Energy Science and Technology; ISSN 1000-6931; ; v. 45(1); p. 1-6

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AbstractAbstract

[en] Using microscopic interacting boson-fermion model formalism, the ground-band, β-band, γ-band and high spins states in even

^{116-122}Xe isotopes are successfully described. It can explain the recent experimental result that collective structures may coexist with the single-particle states and subshell feature. It predicts the energies of 1^{+}statesPrimary Subject

Record Type

Journal Article

Journal

Chinese Physics (Overseas Edition); ISSN 1009-1963; ; v. 9(1); p. 9-12

Country of publication

BETA DECAY RADIOISOTOPES, BETA-PLUS DECAY RADIOISOTOPES, ELECTRON CAPTURE RADIOISOTOPES, ENERGY LEVELS, EVEN-EVEN NUCLEI, HOURS LIVING RADIOISOTOPES, INTERMEDIATE MASS NUCLEI, ISOTOPES, MATHEMATICAL MODELS, MINUTES LIVING RADIOISOTOPES, NUCLEAR MODELS, NUCLEI, RADIOISOTOPES, SECONDS LIVING RADIOISOTOPES, SHELL MODELS, XENON ISOTOPES

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