Quasi-elastic Scattering of 19F+208Pb Systemat Near-and Sub-barrier Energies

  • The quasi-elastic scattering angular distributions of 19F+208Pb system at energies of 88,91,93,96 and 102 MeV have been measured by means of ionization chamber △E-E telescope. The optical potential parameters of the system were obtained from the fit of the angular distributions of the elastic scattering with ECIS code, and the phenomenon of the " threshold anomaly" is clearly observed. The angular distributions and the excitation functions of the products C, N and O from transfer reactions were also obtained. The slope factor k were deduced from the relations between the transfer probabilities and the closest distances for three main transfer channels. The κ values agree with the semi-classical calculation for the single nucleon transfer reaction, but are smaller than the calculation for the mufti-nucleon transfer reactions, and depend on theincident energies. The "slope anomaly. and the energy dependence of κ can not be explained by the semiclassical theory.
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  • [1] R G. Stokstad, Y. Eisen, S. Kaplanis et al., Phys. Rev. Lett., 41(1978)465.[2]H. Q. Zhang, Z. H. Liu, J. C. Xu et al., Nucl. Phys., A512(1990)531.[3]D. Vorkapic, B. Ivanisevic, Phys. Rev., C52(1995)1980.[4]J. S. Lilley et al., Phys. Lett., B128(1983)153.[5]N. Keeley, J. A. Christley, N. M. Clarke et al., Nucl. Phys., A582(1995)314; I. Martel, J. Gomeg-Camacho, C. 0. Blyth et al., Nucl. Phys., A582(1995)357.[6]K E. Rehrn, Heavy Ion Interactions Around the Coulomb Banier, Proceedings of a Symposium, Legnaro, Italy, June 1-4, 1988, editors: C. Signorini, S. Skorka, P. Spolaore, and A. Vitturi, Lecture Notes in Physics 317, Springer-Verlag, Berlin, (1988)P. 105.[7]C. Y. Wu, W. von Oertzen, D. Cline et al., Ann. Rev. Nucl. Part. Sci., 40(1990)285.[8]D. M. Herrick, F. L. H. Wolfs, D. C. Bryan et al., Phys. Rev., C52(1995)755.[9]M. A. Nagarajan, Proceedings of the JAERI International Symposium on Heavy-Ion Reaction Dynamics in Tandem Energy Region, August 1-3, 1988, Hitachi, Japan, edited by Y. Sugiyama, A. Iwmoto, and H. Ikezo, Universal Academy Press, Inc, (1989)P.75.[10]林承键, 紧凑的多路△E-E电离室望远镜系统,原子能科学技术,待发表.[11]J. Raynal, Computing as a Language of Physics, I. A. E. A., Vienna, (1972)P. 281.[12]G. Igo, Phys. Rev. Lett., 1(1958)2; Phys. Rev., 115(1959)1665.[13]H. Timmers, J. R Leigh, M. Dasgupta et al., Nucl. Phys., A384(1995)190.[14]C. Mahaux, H Ngo, G. R Satchler, Nucl. Phys., A449(1986)354.[15]E. Vulgaris et al., Phys. Rev., C33(1986)2017.[16]R B. Roberts et al., Phys. Rev., C47(1993)1831.[17] C. N. Pass et al., Nucl. Phys., A499(1989)173.[18] R. Bass, Nuclear Reactions With Heavy Ions, SpringerVerlag, Berlin, (1980).
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Lin Chengjian, Xu Jincheng, Zhang Huanqiao, Liu Zuhua, Yang Feng and Lu Lixin. Quasi-elastic Scattering of 19F+208Pb Systemat Near-and Sub-barrier Energies[J]. Chinese Physics C, 1997, 21(10): 872-880.
Lin Chengjian, Xu Jincheng, Zhang Huanqiao, Liu Zuhua, Yang Feng and Lu Lixin. Quasi-elastic Scattering of 19F+208Pb Systemat Near-and Sub-barrier Energies[J]. Chinese Physics C, 1997, 21(10): 872-880. shu
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Revised: 1900-01-01
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Quasi-elastic Scattering of 19F+208Pb Systemat Near-and Sub-barrier Energies

    Corresponding author: Lin Chengjian,
  • China Institute of Atomic Energy, Beijing 102413

Abstract: The quasi-elastic scattering angular distributions of 19F+208Pb system at energies of 88,91,93,96 and 102 MeV have been measured by means of ionization chamber △E-E telescope. The optical potential parameters of the system were obtained from the fit of the angular distributions of the elastic scattering with ECIS code, and the phenomenon of the " threshold anomaly" is clearly observed. The angular distributions and the excitation functions of the products C, N and O from transfer reactions were also obtained. The slope factor k were deduced from the relations between the transfer probabilities and the closest distances for three main transfer channels. The κ values agree with the semi-classical calculation for the single nucleon transfer reaction, but are smaller than the calculation for the mufti-nucleon transfer reactions, and depend on theincident energies. The "slope anomaly. and the energy dependence of κ can not be explained by the semiclassical theory.

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