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Chinese Physics C> 2012, Vol. 36> Issue(4) : 380-383 DOI: 10.1088/1674-1137/36/4/016

Using a LaBr3:Ce scintillator for positron annihilation lifetime spectroscopy

  • A LaBr3:Ce scintillator has a high light output (~60000 p.e/MeV) and a short decay constant (<25 ns), which makes it good for time spectrometry. Compared with a BaF2 scintillator, it can bear a much higher count rate, and can be coupled to photomultipliers without using a quartz window. In this work, a positron annihilation lifetime spectrometer (PALS) consisting of two bulks of φ25 mm×25 mm LaBr3:Ce scintillator coupled to two XP20D0 photomultipliers, respectively, was built. A time resolution of FWHM=206 ps was measured for the PALS with a 60Co source at the energy window for 22Na. With this spectrometer, a reasonable lifetime value τ=221±4 ps in a pure Si sample is obtained, which means that the utilization of LaBr3:Ce as the detector for a PALS is feasible.
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    [1] Bauer W, Major J, Weiler W, Maier K, Schaefer H E. in: Positron Annihilation, Proc. of ICPA-7. Eds Jain P C, Singru R M, Gopinathan K P. Singapore: World Scientific,1985. 8042 CHANG T et al. Nuclear Instruments and Methods in Physics Research Section A, 1987, 256(2): 398-4003 WEI Z Y et al. Nuclear Instruments and Methods in Physics Research Section B, 1991, 61(1): 61-664 C zek B F J et al. Nuclear Instruments and Methods in Physics Research Section A, 2000, 443(2-3): 557-5775 WEI Long et al. Materials Science Forum, 2004, 445-446,5166 GAO Xin et al. Nuclear Electronics Detection Technology, 2007, 27(2): 243-249 (in Chinese)7 Haaks M et al. Phys. Stat. Sol.(c), 2007, 4(10): 4036-40398 Moses W, Shah K. Nuclear Instruments and Methods in Physics Research Section A, 2005, 537(1-2): 317-3209 CHANG Tian-Bao et al. HEP NP, 1983, 7(6): 674-680 (in Chinese)10 LI Dao-Wu et al. Chinese Physics C (HEP NP), 2011,35(1): 100-10311 Kansy J. Nucl Instrum Methods A, 1996, 374: 235-24412 Brusa R S et al. Applied Physics A, 1992, 54(3): 233-23813 Dedoussis L T S et al. Journal of Radioanalytical and Nuclear Chemistry, 1996, 211(1): 181-18514 Szczesniak T et al. Nuclear Science, IEEE Transactions on,2009, 56(1): 173-18115 Moses W W, Derenzo S E. Nuclear Science, IEEE Transactions on, 1999, 46(3): 474-478

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LIU Jun-Hui, LI Dao-Wu, ZHANG Zhi-Ming, WANG Bao-Yi, ZHANG Tian-Bao, HAO Jia and WEI Long. Using a LaBr3:Ce scintillator for positron annihilation lifetime spectroscopy[J]. Chinese Physics C, 2012, 36(4): 380-383. doi: 10.1088/1674-1137/36/4/016
LIU Jun-Hui, LI Dao-Wu, ZHANG Zhi-Ming, WANG Bao-Yi, ZHANG Tian-Bao, HAO Jia and WEI Long. Using a LaBr3:Ce scintillator for positron annihilation lifetime spectroscopy[J]. Chinese Physics C, 2012, 36(4): 380-383.  doi: 10.1088/1674-1137/36/4/016 shu
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Received: 2011-06-07
Revised: 2011-11-14
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Using a LaBr3:Ce scintillator for positron annihilation lifetime spectroscopy

  • Received Date: 2011-06-07
  • Accepted Date: 2011-11-14
  • Available Online: 2012-04-05

Abstract: A LaBr3:Ce scintillator has a high light output (~60000 p.e/MeV) and a short decay constant (<25 ns), which makes it good for time spectrometry. Compared with a BaF2 scintillator, it can bear a much higher count rate, and can be coupled to photomultipliers without using a quartz window. In this work, a positron annihilation lifetime spectrometer (PALS) consisting of two bulks of φ25 mm×25 mm LaBr3:Ce scintillator coupled to two XP20D0 photomultipliers, respectively, was built. A time resolution of FWHM=206 ps was measured for the PALS with a 60Co source at the energy window for 22Na. With this spectrometer, a reasonable lifetime value τ=221±4 ps in a pure Si sample is obtained, which means that the utilization of LaBr3:Ce as the detector for a PALS is feasible.

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