百兆电子伏特/核子原子核诱发乳胶核反应靶核反冲质子多重数涨落分析(英文)

Key words: 
• heavy ion collision /
• the target recoil proton /
• multiplicity fluctuation /
• nuclearemulsion

Abstract: 

利用标度阶乘矩方法对290 A MeV $^{12}$C-AgBr, 400 A MeV $^{12}$C-AgBr, 400 A MeV $^{20}$Ne-AgBr及500 A MeV $^{56}$Fe-AgBr 作用靶核反冲质子在二维正常相空间及累积变量空间发射过程中的多重数涨落分别进行了分析。实验结果表明：在正常相空间，对于秩数q较小时标度阶乘矩（$ln

$）随相空间的分割数的增加而增加，而对于秩数较大时标度阶乘矩（$ln

$）随相空间的分割数的增加表现出先增加后趋于饱和或减小的趋势；在累积变量空间，标度阶乘矩（$ln

$）随相空间的分割数的增加而减小，这表明对于我们所研究的核作用体系靶核反冲质子发射过程中不存在非统计涨落。

Multiplicity fluctuation of the target recoil protons emitted in $290$\,A MeV $^{12}$C-AgBr, $400$\,A MeV $^{12}$C-AgBr, $400$\,A MeV $^{20}$Ne-AgBr and $500$\,A MeV $^{56}$Fe-AgBr interactions are studied using the scaled factorial moment (SFM) method in two-dimensional normal phase space and cumulative variable space, respectively. It is found that in normal phase space the SFM ($\ln

$) increases linearly with the increase of the divided number of phase space ($\ln{M}$) for lower q-values and increases linearly and then becomes saturation or decrease with the increase of $\ln{M}$ for higher q-values, and in cumulative variable space $\ln

$ decreases linearly with the increase of $\ln{M}$, which indicates that no evidence of non-statistical multiplicity fluctuation is observed in our data sets.