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Measurement of α-particle quenching in LAB based scintillator in independent small-scale experimentsvon Krosigk, B.; Chen, M.; Hans, S.; Junghans, A. R.; Kögler, T.; Kraus, C.; Kuckert, L.; Liu, X.; Nolte, R.; O’Keeffe, H. M.; Tseung, H. Wan Chan; Wilson, J. R.; Wright, A.; Yeh, M.; Zuber, K.
The European physical journal. C, Particles and fields, 03/2016, Letnik: 76, Številka: 3Journal Article
The α -particle light response of liquid scintillators based on linear alkylbenzene (LAB) has been measured with three different experimental approaches. In the first approach, α -particles were produced in the scintillator via 12 C( n , α ) 9 Be reactions. In the second approach, the scintillator was loaded with 2 % of nat Sm providing an α -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 α -particle signal. The behavior of the observed α -particle light outputs are in agreement with each case successfully described by Birks’ law. The resulting Birks parameter kB ranges from ( 0.0066 ± 0.0016 ) to ( 0.0076 ± 0.0003 ) cm/MeV. In the first approach, the α -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 α -particle response of LAB based scintillator. The observed kB values describing the two light response functions deviate by more than 5 σ . 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.
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