PICA95: An intranuclear-cascade code for 25-MeV to 3.5-GeV photon-induced nuclear reactions
PICA95: An intranuclear-cascade code for 25-MeV to 3.5-GeV photon-induced nuclear reactions
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PICA95：25-MeV 至 3.5-GeV 光子诱发核反应的核内级联代码
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
R. Lillie
中科院分区：
文献类型：
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作者：
C. Fu;T. Gabriel;R. Lillie
PICA95是用于计算入射光子能量高达3.5 GeV的光子诱导核反应的核内级联代码，是对原始PICA代码包的扩展，可用于入射光子能量高达400 MeV。原始代码包括准氘核分裂和单介子产生通道。要使入射光子能量达到3.5 GeV，需要增加能够发射多达5个介子的多介子产生通道。在多体破裂中，相对论相空间关系被用来保存能量和动量。被撞击核子的费米运动和产生的粒子的二次核碰撞都包括在相空间计算中。对入射光子能量为500 MeV、1 GeV和2 GeV时产生的质子、中子、{pi}{sup +}、{pi}{sup 0}和{pi}{sup{负}}的双微分截面计算结果与其他代码的预测结果进行了比较。由于实验数据的稀疏性，需要更多的实验来完善伽马核碰撞模型。
PICA95, an intranuclear-cascade code for calculating photon-induced nuclear reactions for incident photon energies up to 3.5 GeV, is an extension of the original PICA code package that works for incident photon energies up to 400 MeV. The original code includes the quasi-deuteron breakup and single-pion production channels. The extension to an incident photon energy of 3.5 GeV requires the addition of multiple-pion production channels capable of emitting up to five pions. Relativistic phase-space relations are used to conserve energy and momentum in multi-body breakups. Fermi motion of the struck nucleon is included in the phase-space calculations as well as secondary nuclear collisions of the produced particles. Calculated doubly differential cross sections for the productions of protons, neutrons, {pi}{sup +}, {pi}{sup 0}, and {pi}{sup {minus}} for incident photon energies of 500 MeV, 1 GeV, and 2 GeV are compared with predictions by other codes. Due to the sparsity of experimental data, more experiments are needed in order to refine the gamma nuclear collision model.