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180 results on '"Wu, Z. D."'

1. The self-consistent analysis for sub-barrier fusion enhancement effect in Ca + Ca and Ni + Ni

Author

Ma, N. R., Jia, H. M., Lin, C. J., Yang, L., Xu, X. X., Sun, L. J., Yang, F., Wu, Z. D., Zhang, H. Q., Liu, Z. H., and Wang, D. X.

Subjects
Nuclear Theory
Abstract

The fusion dynamic mechanism of heavy-ions at energies near the Coulomb barrier is complicated and still not very clear up to now. Accordingly, a self-consistent method based on the CCFULL calculations has been developed and applied for an ingoing study of the effect of the positive Q-value neutron transfer (PQNT) channels in this work. The typical experimental fusion data of Ca + Ca and Ni + Ni is analyzed within the unified calculation scheme. The PQNT effect in near-barrier fusion is further confirmed based on the self-consistent analysis and extracted quantitatively.

Published
2016
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2. Proton widths of the low-lying 16F states from the 15N(7Li, 6Li)16N reaction

Author

Wu, Z. D., Guo, B., Li, Z. H., Li, Y. J., Su, J., Pang, D. Y., Yan, S. Q., Li, E. T., Bai, X. X., Du, X. C., Fan, Q. W., Gan, L., He, J. J., Jin, S. J., Jing, L., Li, L., Li, Z. C., Lian, G., Liu, J. C., Shen, Y. P., Wang, Y. B., Yu, X. Q., Zeng, S., Zhang, D. H., Zhang, L. Y., Zhang, W. J., and Liu, W. P.

Subjects
Nuclear Experiment
Abstract

All the 16F levels are unbound by proton emission. To date the four low-lying 16F levels below 1 MeV have been experimentally identified with well established spin-parity values and excitation energies with an accuracy of 4 - 6 keV. However, there are still considerable discrepancies for their level widths. The present work aims to explore these level widths through an independent method. The angular distributions of the 15N(7Li, 6Li)16N reaction leading to the first four states in 16N were measured using a high-precision Q3D magnetic spectrograph. The neutron spectroscopic factors and the asymptotic normalization coefficients for these states in 16N were then derived based on distorted wave Born approximation analysis. The proton widths of the four low-lying resonant states in 16F were obtained according to charge symmetry of strong interaction., Comment: 14 pages, 6 figures, 4 tables

Published
2014
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4. Spectroscopic factors for low-lying 16N levels and the astrophysical 15N(n,gamma)16N reaction rate

Author

Guo, B., Li, Z. H., Li, Y. J., Su, J., Pang, D. Y., Yan, S. Q., Wu, Z. D., Li, E. T., Bai, X. X., Du, X. C., Fan, Q. W., Gan, L., He, J. J., Jin, S. J., Jing, L., Li, L., Li, Z. C., Lian, G., Liu, J. C., Shen, Y. P., Wang, Y. B., Yu, X. Q., Zeng, S., Zhang, L. Y., Zhang, W. J., and Liu, W. P.

Subjects
Nuclear Experiment
Abstract

Fluorine is a key element for nucleosynthetic studies since it is extremely sensitive to the physical conditions within stars. The astrophysical site to produce fluorine is suggested to be asymptotic giant branch (AGB) stars. In these stars the 15N(n, g)16N reaction could affect the abundance of fluorine by competing with 15N(a, g)19F. The 15N(n, g)16N reaction rate depends directly on the neutron spectroscopic factors of the low-lying states in 16N. The angular distributions of the 15N(7Li, 6Li)16N reaction populating the ground state and the first three excited states in 16N are measured using a Q3D magnetic spectrograph and are used to derive the spectroscopic factors of these states based on distorted wave Born approximation (DWBA) analysis. The spectroscopic factors of these four states are extracted to be 0.96+-0.09, 0.69+-0.09, 0.84+-0.08 and 0.65+-0.08, respectively. Based on the new spectroscopic factors we derive the 15N(n,g)16N reaction rate. The accuracy and precision of the spectroscopic factors are enhanced due to the first application of high-precision magnetic spectrograph for resolving the closely-spaced 16N levels which can not be achieved in most recent measurement. The present result demonstrates that two levels corresponding to neutron transfers to the 2s1/2 orbit in 16N are not so good single-particle levels although 15N is a closed neutron-shell nucleus. This finding is contrary to the shell model expectation. The present work also provides an independent examination to shed some light on the existing discrepancies in the spectroscopic factors and the 15N(n, g)16N rate., Comment: 13 pages, 4 figures, 2 tables

Published
2013
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5. Sub-barrier fusion of 32S+90,96Zr: semi-classical coupled-channels approach

Author

Zhang, H. Q., Lin, C. J., Yang, F., Jia, H. M., Xu, X. X., Jia, F., Wu, Z. D., Zhang, S. T., Liu, Z. H., Richard, A., and Beck, C.

Subjects
Nuclear Experiment
Abstract

The fusion excitation functions have been measured with rather good accuracy for 32S+90Zr and 32S+96Zr near and below the Coulomb barrier. The sub-barrier cross sections for 32S+96Zr are much larger compared with 32S+90Zr. Semi-classical coupled-channels calculations including two-phonon excitations are capable to describe sub-barrier enhancement only for 32S+90Zr. The remaining disagreement for 32S+96Zr comes from the positive Q-value intermediate neutron transfers in this system. The comparison with 40Ca+96Zr suggests that couplings to the positive Q-value neutron transfer channels may play a role in the sub-barrier fusion enhancement. A rather simple model calculation taking neutron transfers into account is proposed to overcome the discrepancies of 32S+96Zr.

Published
2010

12. Optical potential parameters from 12C + Zr elastic scattering

Author

Gan L., Li Z. H., Sun H. B., Su J., Li Y. J., Yan S. Q., Wang Y. B., Zeng S., Bai X. X., Du X. C., Wu Z. D., Jin S. J., Zhang W. J., Liu W. P., and Li E. T.

Subjects
Physics, QC1-999
Abstract

The angular distributions of 12C + 90,92,94,96Zr elastic scattering were measured with the Q3D magnetic spectrometer at the HI-13 tandem accelerator, Beijing. The real part of optical potential were extracted by analysing these angular distributions. The analysis enable us to avoid the influence of Coulomb effect and to observe the dependence of optical potential on the nuclear properties. With the deduced potential parameters, the experimental elastic scattering angular distributions can be reproduced very well. Formulas to infer global heavy-ion potential parameters were obtained then by analyzing the extracted optical potential parameters. The formulas can be used widely in heavy-ion nuclear reactions.

Published
2016
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24. Surgical Treatment of Primary Liver Cell Carcinoma in China

Author

Wu, Z. D., Xia, S. S., Qiu, F. Z., Herfarth, Ch., editor, Senn, H. J., editor, Baum, M., editor, Diehl, V., editor, von Essen, C., editor, Grundmann, E., editor, Hitzig, W., editor, Rajewsky, M. F., editor, Herfarth, Christian, editor, Schlag, Peter, editor, and Hohenberger, Peter, editor

Published
1986
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25. The sorption isosteric heats of rice grains in China

Author

Li, X.-J., Wu, Z.-D., Zhang, Z.-J., Lu, H., Lin, J.-Y., and Cao, Y.

Subjects
lcsh:Agriculture, Equilibrium moisture content, mathematic model, adsorption, rice, ventilation, lcsh:Botany, desorption, lcsh:S, drying, lcsh:QK1-989
Abstract

Equilibrium moisture content (EMC) data for the grains of thirteen rice cultivars were obtained by gravimetric method at 11% to 96% equilibrium relative humidity (ERH) and 10, 20, 25, 30, and 35°C above nine saturated salt solutions. Six commonly used mathematic models, namely, BET, Modified-Guggenheim–Anderson-deBoer (MGAB), Modified-Chung-Pfost (MCPE), Modified-Henderson (MHE), Modified-Oswin (MOE), and Strohman-Yoerger (STYE), were fitted to the data with evaluating the coefficient of determination, residue sum-of-squares, standard error of estimate, mean relative percent error, and residual plots. The best fitted equations to the EMC/ERH data were MCPE and STYE, but MCPE is three-parameter, readily transformed equation and adopted in this study. The isosteric heats for both rice desorption and adsorption, and for both the sorption of Japonica and Indica rice, decreased rapidly with an increase in seed moisture content until the moisture content of 20% d.b. (dry basis) was reached, and thereafter they decreased smoothly with increasing moisture content. The isosteric heats of rice desorption were higher than those of adsorption below 22.5% d.b. EMC, but thereafter there was no difference found between desorption and adsorption. The sorption isosteric heats of Indica rice were slightly higher than those of Japonica rice under all moisture contents at a constant temperature.

Published
2010

29. Radii of the bound states in 16 N from the asymptotic normalization coefficients

Author

Li, E. T., primary, Guo, B., additional, Li, Z. H., additional, Wang, Y. B., additional, Li, Y. J., additional, Wu, Z. D., additional, Su, J., additional, Pang, D. Y., additional, Bai, X. X., additional, Du, X. C., additional, Fan, Q. W., additional, Gan, L., additional, Han, Z. Y., additional, Hao, X., additional, Hu, S. P., additional, He, J. J., additional, Jing, L., additional, Jin, S. J., additional, Li, L., additional, Li, X. Y., additional, Li, Z. C., additional, Lian, G., additional, Liu, J. C., additional, Luo, Q., additional, Qiao, L. H., additional, Shen, Y. P., additional, Sun, H. B., additional, Yan, S. Q., additional, Yu, X. Q., additional, Zeng, S., additional, Zhang, D. H., additional, Zhang, L. Y., additional, Zhang, W. J., additional, Zhou, Y., additional, and Liu, W. P., additional

Published
2016
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30. Spectroscopic factors for low-lying 16N levels and the astrophysical 15N(n,gamma)16N reaction rate

Author

Guo, B., Li, Z. H., Li, Y. J., Su, J., Pang, D. Y., Yan, S. Q., Wu, Z. D., Li, E. T., Bai, X. X., Du, X. C., Fan, Q. W., Gan, L., He, J. J., Jin, S. J., Jing, L., Li, L., Li, Z. C., Lian, G., Liu, J. C., Shen, Y. P., Wang, Y. B., Yu, X. Q., Zeng, S., Zhang, L. Y., Zhang, W. J., and Liu, W. P.

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

Fluorine is a key element for nucleosynthetic studies since it is extremely sensitive to the physical conditions within stars. The astrophysical site to produce fluorine is suggested to be asymptotic giant branch (AGB) stars. In these stars the 15N(n, g)16N reaction could affect the abundance of fluorine by competing with 15N(a, g)19F. The 15N(n, g)16N reaction rate depends directly on the neutron spectroscopic factors of the low-lying states in 16N. The angular distributions of the 15N(7Li, 6Li)16N reaction populating the ground state and the first three excited states in 16N are measured using a Q3D magnetic spectrograph and are used to derive the spectroscopic factors of these states based on distorted wave Born approximation (DWBA) analysis. The spectroscopic factors of these four states are extracted to be 0.96+-0.09, 0.69+-0.09, 0.84+-0.08 and 0.65+-0.08, respectively. Based on the new spectroscopic factors we derive the 15N(n,g)16N reaction rate. The accuracy and precision of the spectroscopic factors are enhanced due to the first application of high-precision magnetic spectrograph for resolving the closely-spaced 16N levels which can not be achieved in most recent measurement. The present result demonstrates that two levels corresponding to neutron transfers to the 2s1/2 orbit in 16N are not so good single-particle levels although 15N is a closed neutron-shell nucleus. This finding is contrary to the shell model expectation. The present work also provides an independent examination to shed some light on the existing discrepancies in the spectroscopic factors and the 15N(n, g)16N rate., Comment: 13 pages, 4 figures, 2 tables

Published
2014
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32. Optical potential parameters from12C + Zr elastic scattering

Author

Gan, L., primary, Li, Z. H., additional, Sun, H. B., additional, Su, J., additional, Li, Y. J., additional, Yan, S. Q., additional, Wang, Y. B., additional, Zeng, S., additional, Bai, X. X., additional, Du, X. C., additional, Wu, Z. D., additional, Jin, S. J., additional, Zhang, W. J., additional, Liu, W. P., additional, and Li, E. T., additional

Published
2016
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34. Proton spectroscopic factor of the12Cground state from the12C(11B,12C)11Belastic transfer reaction

Author

Li, E. T., primary, Li, Z. H., additional, Li, Y. J., additional, Guo, B., additional, Wang, Y. B., additional, Pang, D. Y., additional, Su, J., additional, Yan, S. Q., additional, Zeng, S., additional, Gan, L., additional, Li, Z. C., additional, Liu, J. C., additional, Bai, X. X., additional, Wu, Z. D., additional, Jin, S. J., additional, Zhang, L. Y., additional, Yu, X. Q., additional, Li, L., additional, Sun, H. B., additional, Lian, G., additional, Fan, Q. W., additional, and Liu, W. P., additional

Published
2014
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36. Studies for the effect of the positive Q-value neutron transfers on sub-barrier heavy-ion fusion.

Author

JIA, H. M., LIN, C. J., YANG, L., XU, X. X., MA, N. R., SUN, L. J., YANG, F., WU, Z. D., ZHANG, H. Q., LIU, Z. H., and WANG, D. X.

Subjects
COUPLING constants, INELASTIC scattering, HEAVY ions, ELECTROSTATICS, SCATTERING (Physics)
Abstract

This contribution reports the recent experimental studies for the coupling effect of the positive Q-value neutron transfer (PQNT) channels on near-barrier fusion with heavy-ions, measured by an electrostatic deflector setup. This effect is expected to be important in some situations. In this presentation, the experimental studies for the nearbarrier fusion of 32S + 90,94,96Zr, 16O + 76Ge, 18O + 74Ge, and 16,18O + 58Ni are reported. Also a method, based on the CCFULL calculations with suitable inelastic couplings, to sort out the PQNT effect is presented. [ABSTRACT FROM AUTHOR]

Published
2016
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37. Sub-barrier backward quasielastic scattering: A probe of the hexadecapole deformation.

Author

ZHANG, H. Q., LIN, C. J., JIA, H. M., YANG, L., XU, X. X., YANG, F., WU, Z. D., LIU, Z. H., MA, N. R., SUN, L. J., and WANG, D. X.

Subjects
QUASIELASTIC light scattering, MAGNETIC pole, COULOMB barriers (Nuclear fusion), NUCLEAR shapes, RADIOISOTOPES, RADIOACTIVE nuclear beams
Abstract

The quasielastic scattering excitation functions for 16O + 152Sm, 170Er and 174Yb were measured with high precision at a backward angle with small energy intervals at energies near the Coulomb barriers. The hexadecapole deformation (β4) of the target nuclei was extracted by using the lower-energy data and the obtained values agree with the available results reasonably well. This offers a sensitive method to extract β4. This method is especially meaningful for the radioactive nuclei considering the low beam intensities. [ABSTRACT FROM AUTHOR]

Published
2016
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38. Optical potential parameters from 12C + Zr elastic scattering.

Author

Gan, L., Li, Z. H., Sun, H. B., Su, J., Li, Y. J., Yan, S. Q., Wang, Y. B., Zeng, S., Bai, X. X., Du, X. C., Wu, Z. D., Jin, S. J., Zhang, W. J., Liu, W. P., and Li, E. T.

Subjects
ELASTIC scattering, MAGNETIC spectrometer, TANDEM accelerators, ANGULAR distribution (Nuclear physics), HEAVY ion collisions
Abstract

The angular distributions of 12C + 90,92,94,96zr elastic scattering were measured with the Q3D magnetic spectrometer at the HI-13 tandem accelerator, Beijing. The real part of optical potential were extracted by analysing these angular distributions. The analysis enable us to avoid the influence of Coulomb effect and to observe the dependence of optical potential on the nuclear properties. With the deduced potential parameters, the experimental elastic scattering angular distributions can be reproduced very well. Formulas to infer global heavy-ion potential parameters were obtained then by analyzing the extracted optical potential parameters. The formulas can be used widely in heavy-ion nuclear reactions. [ABSTRACT FROM AUTHOR]

Published
2016
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41. Proton widths of the low-lying16Fstates from the15N(7Li,6Li)16Nreaction

Author

Wu, Z. D., primary, Guo, B., additional, Li, Z. H., additional, Li, Y. J., additional, Su, J., additional, Pang, D. Y., additional, Yan, S. Q., additional, Li, E. T., additional, Bai, X. X., additional, Du, X. C., additional, Fan, Q. W., additional, Gan, L., additional, He, J. J., additional, Jin, S. J., additional, Jing, L., additional, Li, L., additional, Li, Z. C., additional, Lian, G., additional, Liu, J. C., additional, Shen, Y. P., additional, Wang, Y. B., additional, Yu, X. Q., additional, Zeng, S., additional, Zhang, D. H., additional, Zhang, L. Y., additional, Zhang, W. J., additional, and Liu, W. P., additional

Published
2014
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43. Experimental Research on Two-Proton Emissions from the Excited States of Proton-Rich Nuclei Close to the Drip Line

Author

Lin, C. J., primary, Xu, X. X., additional, Jia, H. M., additional, Yang, F., additional, Wu, Z. D., additional, Zhang, H. Q., additional, Liu, Z. H., additional, Yang, L., additional, Bao, P. F., additional, Sun, L. J., additional, Xu, H. S., additional, Wang, J. S., additional, Yang, Y. Y., additional, Sun, Z. Y., additional, Hu, Z. G., additional, Wang, M., additional, Jin, S. L., additional, Han, J. L., additional, Lei, X. G., additional, Zhang, N. T., additional, Chen, S. Z., additional, Huang, M. R., additional, Ma, P., additional, Ma, J. B., additional, Chen, J. B., additional, Zhang, Y. H., additional, Zhou, X. H., additional, Ma, X. W., additional, and Xiao, G. Q., additional

Published
2014
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44. Spectroscopic factors for low-lyingN16levels and the astrophysicalN15(n,γ)N16reaction rate

Author

Guo, B., primary, Li, Z. H., additional, Li, Y. J., additional, Su, J., additional, Pang, D. Y., additional, Yan, S. Q., additional, Wu, Z. D., additional, Li, E. T., additional, Bai, X. X., additional, Du, X. C., additional, Fan, Q. W., additional, Gan, L., additional, He, J. J., additional, Jin, S. J., additional, Jing, L., additional, Li, L., additional, Li, Z. C., additional, Lian, G., additional, Liu, J. C., additional, Shen, Y. P., additional, Wang, Y. B., additional, Yu, X. Q., additional, Zeng, S., additional, Zhang, L. Y., additional, Zhang, W. J., additional, and Liu, W. P., additional

Published
2014
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47. Erratum: New determination of the proton spectroscopic factor in9Befrom the13C(9Be,8Li)14Nangular distribution [Phys. Rev. C87, 017601 (2013)]

Author

Li, Z. H., primary, Li, Y. J., additional, Su, J., additional, Guo, B., additional, Li, E. T., additional, Dong, K. J., additional, Bai, X. X., additional, Li, Z. C., additional, Liu, J. C., additional, Yan, S. Q., additional, Wang, Y. B., additional, Zeng, S., additional, Lian, G., additional, Wang, B. X., additional, Jin, S. J., additional, Liu, X., additional, Zhang, W. J., additional, Huang, W. Z., additional, Fan, Q. W., additional, Gan, L., additional, Wu, Z. D., additional, and Liu, W. P., additional

Published
2013
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48. New determination of the proton spectroscopic factor in9Be from the13C(9Be,8Li)14N angular distribution

Author

Li, Z. H., primary, Li, Y. J., additional, Su, J., additional, Guo, B., additional, Li, E. T., additional, Dong, K. J., additional, Bai, X. X., additional, Li, Z. C., additional, Liu, J. C., additional, Yan, S. Q., additional, Wang, Y. B., additional, Zeng, S., additional, Lian, G., additional, Wang, B. X., additional, Jin, S. J., additional, Liu, X., additional, Zhang, W. J., additional, Huang, W. Z., additional, Fan, Q. W., additional, Gan, L., additional, Wu, Z. D., additional, and Liu, W. P., additional

Published
2013
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49. QUASI-ELASTIC SCATTERING OF THE PROTON DRIP LINE NUCLEUS 17F ON 12C AT 60 MeV

Author

ZHANG, H. Q., primary, LIN, C. J., additional, JIA, H. M., additional, AN, G. P., additional, WU, Z. D., additional, XU, X. X., additional, YANG, F., additional, LIU, Z. H., additional, ZHANG, G. L., additional, PANG, D. Y., additional, ZHANG, C. L., additional, KUBONO, S., additional, YAMAGUCHI, H., additional, HAYAKAWA, S., additional, BINH, D. N., additional, MAZZOCCO, M., additional, and SIGNORINI, C., additional

Published
2013
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