Physical design of positronium time of flight spectroscopy apparatus

JIANG Xiao-Pan; ZHANG Zi-Liang; QIN Xiu-Bo; YU Run-Sheng; WANG Bao-Yi

Chinese Physics C> 2010, Vol. 34> Issue(12) : 1890-1894

Physical design of positronium time of flight spectroscopy apparatus

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Abstract：
Positronium time of flight spectroscopy (Ps-TOF) is an effective technique for porous material research. It has advantages over other techniques for analyzing the porosity and pore tortuosity of materials. This paper describes a design for Ps-TOF apparatus based on the Beijing intense slow positron beam, supplying a new material characterization technique. In order to improve the time resolution and increase the count rate of the apparatus, the detector system is optimized. For 3 eV o-Ps, the time broadening is 7.66 ns and the count rate is 3 cps after correction.

References

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Kurihara T,Yagishita A,Enomoto Aet al.Phys.Rev.B,2000,171:164-171[2] Mondal N N,Harnatsu R,Hirose T et al.Applied Surface Science,1999,149:269-275[3] Tuomisaari M,Howell R H,McMullen T et al.Phys.Rev.B,1989,40:2060-2069[4] YU R S,Ohdaira T,Suzuki R et al.Appl.Phys.Lett.,2003,83:4966-4968[5] YU Wei-Zhong.Principles and Applications of Positron Annihilation.Beijing:Science Press,2003(in Chinese)[6] CAO Xing-Zhong et al.HEP NP,2004,28(5):560-563(in Chinese)[7] CAO Xing-Zhong et al.Nuclear Science and Techniques,2004,27(6):435-439(in Chinese)[8] WANG Bao-Yi,YU Wei-Zhong et al.BSRF Annals,2000,(1):276-277(in Chinese)[9] WANG Ping et al.HEP NP,2006,30(10):1036-1040(in Chinese)[10] Nagashima Y,Morinaka Y,Kurihara T et al.Phys.Rev.B,1998,58:12676-12679[11] GEANT-Detector Description and Simulation Tool,CERN Program Library,CERN Geneva,Switzerland[12] TENG Min-Kang.Spectroscopy and Applications of Positron Annihilation.Beijing:Atomic Energy Press,2000.21-47(in Chinese)

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JIANG Xiao-Pan, ZHANG Zi-Liang, QIN Xiu-Bo, YU Run-Sheng and WANG Bao-Yi. Physical design of positronium time of flight spectroscopy apparatus[J]. Chinese Physics C, 2010, 34(12): 1890-1894.

JIANG Xiao-Pan, ZHANG Zi-Liang, QIN Xiu-Bo, YU Run-Sheng and WANG Bao-Yi. Physical design of positronium time of flight spectroscopy apparatus[J]. Chinese Physics C, 2010, 34(12): 1890-1894. shu

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Received: 2009-12-28
Revised: 2010-01-24

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沈阳化工大学材料科学与工程学院沈阳 110142

Physical design of positronium time of flight spectroscopy apparatus

Corresponding author: WANG Bao-Yi,

Received Date: 2009-12-28
Accepted Date: 2010-01-24
Available Online: 2010-12-05

Abstract:

Positronium time of flight spectroscopy (Ps-TOF) is an effective technique for porous material research. It has advantages over other techniques for analyzing the porosity and pore tortuosity of materials. This paper describes a design for Ps-TOF apparatus based on the Beijing intense slow positron beam, supplying a new material characterization technique. In order to improve the time resolution and increase the count rate of the apparatus, the detector system is optimized. For 3 eV o-Ps, the time broadening is 7.66 ns and the count rate is 3 cps after correction.