Measurement of α-particle quenching in LAB based scintillator in independent small-scale experiments


Measurement of α-particle quenching in LAB based scintillator in independent small-scale experiments

von Krosigk, B.; Chen, M.; Hans, S.; Junghans, A. R.; Kögler, T.; Kraus, C.; Kuckert, L.; Liu, X.; Nolte, R.; O’Keeffe, H. M.; Wan Chan Tseung, H.; Wilson, J. R.; Wright, A.; Yeh, M.; Zuber, K.

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 12C(n,alpha)9Be reactions. In the second approach, the scintillator was loaded with 2% of natSm providing an alpha–emitter, 147Sm, as an internal source. In the third approach, a scintillator flask was deployed into the water–filled SNO+ detector and the radioactive contaminants 222Rn, 218Po and 214Po 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 +- 0.0014) cm/MeV to (0.0076+-0.0003) 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.

Keywords: Liquid Scintillatiors; Linear Alcyl Benzene

Permalink: https://www.hzdr.de/publications/Publ-21967
Publ.-Id: 21967