The Study of Giant Dipole Resonance in Hot Nuclei in the 40Ar+93Nb Reaction at 25MeV/u

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Zhang Baoguo, Wang Sufang, Duan Limin, Wen Wanxin, Jin Genming, Zheng Jiwen, Li Zuyu, He Zhiyong, Xiao Zhigang and Wang Hongwei. The Study of Giant Dipole Resonance in Hot Nuclei in the 40Ar+93Nb Reaction at 25MeV/u[J]. Chinese Physics C, 1998, 22(9): 795-802.
Zhang Baoguo, Wang Sufang, Duan Limin, Wen Wanxin, Jin Genming, Zheng Jiwen, Li Zuyu, He Zhiyong, Xiao Zhigang and Wang Hongwei. The Study of Giant Dipole Resonance in Hot Nuclei in the 40Ar+93Nb Reaction at 25MeV/u[J]. Chinese Physics C, 1998, 22(9): 795-802. shu
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Received: 1900-01-01
Revised: 1900-01-01
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The Study of Giant Dipole Resonance in Hot Nuclei in the 40Ar+93Nb Reaction at 25MeV/u

    Corresponding author: Zhang Baoguo,
  • Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000

Abstract: Gamma rays, light charged particles and evaporation residues emitted from hot nuclei formed in the 40Ar+93Nb reaction at 25MeV/u have been measured.The initial excitation energies of the hot nuclei can be deduced from the velocity of the incomplete fusion residues by applying a massive transfer model. The integrated γ multiplicity, after bremsstrahlung substraction, is constant as a function of excitation Statistical calculations were performed by using the CASCADE code, and compared with experimental data. The main effects which can lead to the saturation of the GDR γmultiplicity at high excitation energies were discussed. The experimental data can be fitted by assuming a cutoff of γ emission from the resonance above an excitation energy of approximate 250MeV.

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