Semi-empirical formulas for heavy-ion stripping data
Semi-empirical formulas for heavy-ion stripping data
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DOI：
10.1051/rphysap:0197700120100154300
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发表时间：
1977-10
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影响因子：
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通讯作者：
R. Sayer
中科院分区：
文献类型：
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作者：
R. Sayer
分析了在平衡或接近平衡条件下，重离子在稀气体和碳箔中电荷态的所有可用测量值，以改进分布参数的半经验公式。各实验分布拟合为非对称函数F/sub q/ = F/sub m/C x exp (-0.5 t/sup 2//(1 + epsilon t))，其中t = (q - q/sub 0/)/rho， q/sub 0/为最大强度电荷值。随后将得到的分布参数q/sub 0/、rho和epsilon与弹丸装药和速度的经验函数拟合，q/sub 0/的均方根偏差约为0.5，q/sub 0//Z的均方根偏差约为4%，rho的均方根偏差约为5%至7%，epsilon/rho的均方根偏差为0.03。对于稀气体中重离子的小F/sub q/值的预测，不对称分布比以前的表达式有了实质性的改进。
All available charge state measurements for heavy ions in dilute gases and carbon foils at equilibrium or near-equilibrium conditions were analyzed to improve semi-empirical formulas for the distribution parameters. Each experimental distribution was fit to an asymmetric function F/sub q/ = F/sub m/C x exp (-0.5 t/sup 2//(1 + epsilon t)), where t = (q - q/sub 0/)/rho and q/sub 0/ is the maximum intensity charge value. Subsequent fits of the resultant distribution parameters q/sub 0/, rho, and epsilon to empirical functions of projectile charge and velocity yielded rms deviations of about 0.5 for q/sub 0/, 4 percent for q/sub 0//Z, 5 to 7 percent for rho, and 0.03 for epsilon/rho. The asymmetric distribution gives substantial improvement over previous expressions for prediction of small F/sub q/ values for heavy ions in dilute gases.