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Paper   IPM / P / 7929
School of Physics
  Title:   Emission Angle Dependence of Fission Fragments Spin in B10,11+Np237 Fusion-Fusion Reactions
  Author(s):  M.R. Pahlavani
  Status:   In Proceedings
  Proceeding: Proceedings of XI Regional Conference on Mathematical Physics, 3-6 May 2004, p75-77, Tehran, Iran
  Year:  2004
  Pages:   75-77
  Supported by:  IPM
The total average spin of the fragments is measured for B10,11 as projectiles and Np237 as target at energies around coulomb barrier for fragments emitted in 165°, 150°, 105° and 90° relative to beam direction using γ−raymultiplicity measurement method. Theoretical calculations have been performed by using Transition State Model(TSM). Measured fragments spin show a weak angle dependence when compared to the calculated results using TSM. In the framework of TSM the angular distribution of K degree of freedom. To explain the weak measured emission angle dependence of fragments spin, the gaussian distribution that was considered for K should be considerably modified.

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