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首页> 外文会议>International conference on dynamical aspects of nuclear fission >Fission fragment mass-energy distributions and gamma-ray multiplicities in multimodal fission of light thorium isotopes
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Fission fragment mass-energy distributions and gamma-ray multiplicities in multimodal fission of light thorium isotopes

机译：裂变片段质量能量分布和伽马射线多数制钍同位素的多峰裂变

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The fission fragment mass-energy distributions and the gamma -rays from the multimodal fission of the ~220,224,226 Th was investigated. The corresponding excitation energies at the saddle point, E_sp, ranged from 16 to 40 MeV. As E_sp decreases, an asymmetric mass component becomes visible on the predominately symmetric mass distribution. The contribution of the asymmetric mode is characterizedby the total yield ratio Y_s/Y_a, which decreases rapidly for hte heavier isotopes of thorium. For all isotopes studied, the substracted the heavier isotopes of thorium. For all isotopes studied, the substracted asymmetric fission component, Y_a=Y_t-Y_s, exhibits a complex structure. The average gamma -ray multiplicities and relative gamma -ray energies as a function fo the mass of the fission fragments also exhibit a complex structure and strong variations. Such strong variations have never been previously observed in heavy ion-induced fusion-fission reactions. OBtaiend results may be explained with the influenceof shell effects on the properties of the fission fragments.
机译：研究了裂变片段质量 - 能量分布和来自〜220,224,226〜的多峰裂解的γ-rays。在鞍点，E_SP中的相应励磁能量范围为16至40MeV。随着E_SP减小，在主要对称的质量分布上，不对称质量分量变得可见。不对称模式的贡献表征了总屈服比Y_S / Y_A，其迅速降低HTE钍的同位素。对于所研究的所有同位素，减去钍的较重同位素。对于所研究的所有同位素，减去不对称裂变分量Y_A = Y_T-Y_S表现出复杂的结构。作为裂变片段质量的功能的平均伽马 - 射线多样性和相对伽马 - 射线能量也表现出复杂的结构和强烈的变化。在重离子诱导的融合反应中，从未观察过这种强的变化。可以利用壳体效应对裂变片段的性质的影响来解释癫痫结果。

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