Observation of anticorrelation between scintillation and ionization for MeV gamma rays in liquid xenon
Observation of anticorrelation between scintillation and ionization for MeV gamma rays in liquid xenon
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DOI：
10.1103/physrevb.76.014115
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发表时间：
2007-04
影响因子：
3.7
通讯作者：
E. Aprile;K. Giboni;P. Majewski;K. Ni;M. Yamashita
中科院分区：
文献类型：
--
作者：
E. Aprile;K. Giboni;P. Majewski;K. Ni;M. Yamashita
液态氙中 MeV $\ensuremath{\gamma}$ 射线产生的电离和闪烁信号之间的强反相关性已被测量，并用于通过组合这两个信号来提高能量分辨率。与单个信号的波动相比，组合信号的电子-离子复合波动减少，从而解释了这种改进。使用 $^{137}\mathrm{Cs}$、$^{22}\mathrm{Na}$ 和 $^{60}\mathrm{Co}$ $\ensuremath{\gamma}$ 射线同时测量电离和闪烁信号，作为液体中电场的函数。在 $1\phantom{\rule{0.3em}{0ex}}\mathrm{kV}∕\mathrm{cm}$ 处测量的分辨率为 $662\phantom{\rule{0.3em}{0ex}}\mathrm{keV}$ 处的 $1.7%(\ensuremath{\sigma})$，明显优于单独的闪烁或电离的分辨率。详细分析表明，通过更高的光收集效率和更低的电子噪声，可以进一步改善到低于 1%(\ensuremath{\sigma})$。
A strong anticorrelation between ionization and scintillation signals produced by MeV $\ensuremath{\gamma}$ rays in liquid xenon has been measured and used to improve the energy resolution by combining the two signals. The improvement is explained by reduced electron-ion recombination fluctuations of the combined signal compared to fluctuations of the individual signals. Simultaneous measurements of ionization and scintillation signals were carried out with $^{137}\mathrm{Cs}$, $^{22}\mathrm{Na}$, and $^{60}\mathrm{Co}$ $\ensuremath{\gamma}$ rays, as a function of electric field in the liquid. A resolution of $1.7%(\ensuremath{\sigma})$ at $662\phantom{\rule{0.3em}{0ex}}\mathrm{keV}$ was measured at $1\phantom{\rule{0.3em}{0ex}}\mathrm{kV}∕\mathrm{cm}$, significantly better than the resolution from either scintillation or ionization alone. A detailed analysis indicates that further improvement to less than $1%(\ensuremath{\sigma})$ is possible with higher light collection efficiency and lower electronic noise.