The $\alpha$-particle light response of liquid scintillators based on linear alkylbenzene (LAB) has been measured with three different experimental approaches. In the first approach, $\alpha$-particles were produced in the scintillator via $^{12}$C($n$,$\alpha$)$^9$Be reactions. In the second approach, the scintillator was loaded with 2% of $^{\mathrm{nat}}$Sm providing an $\alpha$-emitter, $^{147}$Sm, as an internal source. In the third approach, a scintillator flask was deployed into the water-filled SNO+ detector and the radioactive contaminants $^{222}$Rn, $^{218}$Po and $^{214}$Po provided the $\alpha$-particle signal. The behavior of the observed $\alpha$-particle light outputs are in agreement with each case successfully described by Birks' law. The resulting Birks parameter $kB$ ranges from $(0.0066\pm0.0016)$ cm/MeV to $(0.0076\pm0.0003)$ cm/MeV. In the first approach, the $\alpha$-particle light response was measured simultaneously with the light response of recoil protons produced via neutron-proton elastic scattering. This enabled a first time a direct comparison of $kB$ describing the proton and the $\alpha$-particle response of LAB based scintillator. The observed $kB$ values describing the two light response functions deviate by more than $5\sigma$. The presented results are valuable for all current and future detectors, using LAB based scintillator as target, since they depend on an accurate knowledge of the scintillator response to different particles.
翻译:以直线烷基苯(LAB)为基础的液体焚化器的美元-粒子光度反应以三种不同的实验方法测量。 在第一种方法中,通过 $12}C(美元,美元)C(美元)C(美元)pha美元)9美元反应在焚化炉中生产了1美元-粒子。在第二种方法中,焚化炉装入了2% $mathrm{纳特 美元(美元),提供了美元-汽化器(美元)美元-汽化器(美元),提供了美元-汽化器(美元),作为内部来源。在第二种方法中,在装满水的SNO+探测器和放射性污染物中生产了1美元222美元(美元)C(美元)C(美元)美元)美元-平价(美元)的燃烧器(美元)光度(美元),在Birks 法律中成功地描述了每起案件的精确-美元-美元(美元) 比较结果(美元) 将Birks 参数(美元) 美元- 美元(美元) (美元) 蛋化器(美元) 数据(美元) 数据(美元) 计算出直径(美元) (美元) (美元) (美元) (美元) (美元) (美元) (美元) (美元) (美元) (美元) (美元) (美元) (美元) (美元)