Positronium annihilation in silica aerogel studied by a positron age-momentum correlation technique

WANG Dan-Ni; ZHANG Lan-Zhi; WANG Bao-Yi; YU Run-Sheng; ZHANG Zhi-Ming; LI Dao-Wu; WEI Long

doi:10.1088/1674-1137/33/1/017

Chinese Physics C> 2009, Vol. 33> Issue(1) : 81-84 DOI: 10.1088/1674-1137/33/1/017

Positronium annihilation in silica aerogel studied by a positron age-momentum correlation technique

Abstract
HTML
Reference
Related

PDF

Abstract：
A high-performance positron age-momentum correlation (AMOC) spectrometer was newly developed. The counting rate is increased up to 200 cps much larger than the value 20~cps reported by other international groups. And at the same time, the time resolution still keeps at the international level of 220 ps. Furthermore, positronium (Ps) annihilation in silica aerogel was investigated by AMOC, which indicates: (1) Ps annihilation between the grains dominantly undergoes pick-off process and spin conversion from o-Ps to p-Ps; (2) Annealing below 400 ℃ changes the grain surface conditions, i. e. the desorption of hydrogen and the decrease of the defect centers concentration.

References

[1]

. Suzuki R, Mikado T, Ohgaki H et al. Phys. Rev. B, 1994,49: 174842. Brandt W. Positron Solid-State Physics. Edited Brandt W,Dupasquier A. North-Holland, Amsterdam, 1983. 83. Suzuki N, Oonishi T, Hyodo T et al. Appl. Phys. A, 2002,74: 7914. Bamford D, Dlubek G, Dommet G et al. Polymer, 2006,47: 34865. Shinohara N, Suzuki N, Chang T et al. Phys. Rev. A, 2001,64: 0427026. Tanigawa S. Positron Annihilation, ICPA-5. The Japan In-stitute of Metals, 1979. 7037. Stoll H, Castellaz P, Siegle A. Principles and Applicationsof Positron Positronium Chemistry. Edited Jean Y C,Mallon P E, Schrader D M. Singapore: World Scienti c,2003. 3568. Stoll H, Koch M, Lau U et al. Appl. Surf. Sci., 1995, 85:179. WANG Bao-Yi, WANG Dan-Ni, ZHANG Zhi-Ming etal. Fast Parallel Multi-channel Data Acquisition Sys-tem for Nuclear Spectroscopy Measurement. Patent No.200510125706.1, 200510. Siegle A, Stoll H, Castellaz P et al. Appl. Surf. Sci., 1997,116: 14011. Itoh Y, Murakami H, Kinoshita A. Appl. Surf. Sci., 1996,102: 423

[1]	LIU Xiao-Yan , LU Jing-Bin , YANG Yan-Ji , LU Bo , WANG Yu-Sa , XU Yu-Peng , CUI Wei-Wei , LI Wei , LI Mao-Shun , WANG Juan , HAN Da-Wei , CHEN Tian-Xiang , HUO Jia , HU Wei , ZHANG Yi , ZHU Yue , ZHANG Zi-Liang , YIN Guo-He , WANG Yu , ZHAO Zhong-Yi , FU Yan-Hong , ZHANG Ya , MA Ke-Yan , CHEN Yong . A digital CDS technique and its performance testing. Chinese Physics C, 2015, 39(7): 076101. doi: 10.1088/1674-1137/39/7/076101
[2]	WANG Xiao-Long , DONG Lan , WU Lei , LI Chun-Hua . Analysis and experimental concepts of the vibrating wire alignment technique. Chinese Physics C, 2014, 38(11): 117010. doi: 10.1088/1674-1137/38/11/117010
[3]	AN Ran , CHEN Bin , LIU Yan-Fen , YE Bang-Jiao , KONG Wei , Stefan Ritt . A new positron annihilation lifetime spectrometer based on DRS4 waveform digitizing board. Chinese Physics C, 2014, 38(5): 056001. doi: 10.1088/1674-1137/38/5/056001
[4]	DENG Wen , SUN Xiao-Xiang , TAN Shao-Xi , LI Yu-Xia , XIONG Ding-Kang , HUANG Yu-Yang . Defects and hyperfine interactions in binary Fe-Al alloys studied by positron annihilation and Mössbauer spectroscopies. Chinese Physics C, 2013, 37(12): 128201. doi: 10.1088/1674-1137/37/12/128201
[5]	LIU Jun-Hui , LI Dao-Wu , ZHANG Zhi-Ming , WANG Bao-Yi , ZHANG Tian-Bao , HAO Jia , WEI Long . Using a LaBr₃:Ce scintillator for positron annihilation lifetime spectroscopy. Chinese Physics C, 2012, 36(4): 380-383. doi: 10.1088/1674-1137/36/4/016
[6]	LI Dao-Wu , LIU Jun-Hui , ZHANG Zhi-Ming , WANG Bao-Yi , ZHANG Tian-Bao , WEI Long . A compact positron annihilation lifetime spectrometer. Chinese Physics C, 2011, 35(1): 100-103. doi: 10.1088/1674-1137/35/1/021
[7]	JIANG Xiao-Pan , ZHANG Zi-Liang , QIN Xiu-Bo , YU Run-Sheng , WANG Bao-Yi . Physical design of positronium time of flight spectroscopy apparatus. Chinese Physics C, 2010, 34(12): 1890-1894.
[8]	J. H. Kühn . Strong coupling, charm- and bottom-quark masses from electron-positron annihilation. Chinese Physics C, 2010, 34(6): 675-679. doi: 10.1088/1674-1137/34/6/011
[9]	FU Yao , FANG De-Qing , MA Yu-Gang , CAI Xiang-Zhou , GUO Wei , MA Chun-Wang , TIAN Wen-Dong , WANG Hong-Wei , WANG Kun . Isoscaling behavior studied by HIPSE model. Chinese Physics C, 2009, 33(S1): 126-129. doi: 10.1088/1674-1137/33/S1/040
[10]	HUANG Yan-Ping , WU Yuan-Fang . Centrality, azimuthal and rapidity dependence of two-particle transverse-momentum correlation in relativistic heavy ion collisions. Chinese Physics C, 2009, 33(4): 281-284. doi: 10.1088/1674-1137/33/4/008
[11]	ZHANG Zhe , QIN Xiu-Bo , WANG Dan-Ni , YU Run-Sheng , WANG Qiao-Zhan , MA Yan-Yun , WANG Bao-Yi . Identification of pore size in porous SiO₂ thin film by positron annihilation. Chinese Physics C, 2009, 33(2): 156-160. doi: 10.1088/1674-1137/33/2/015
[12]	ZHOU Chun-Lan , WANG Dan-Ni , HE Chuang-Xin , WANG Bao-Yi , WEI Long , HE Qing , JIA Quan-Jie . Study on Pores and Defect by Synthrotron Radiation Small Angle Reflection Method and Slow Positron Annihilation Technique. Chinese Physics C, 2003, 27(S1): 67-71.
[13]	He Yuanjin , Xin Mingrui , Zhang Tianbao . Measurement of Characteristic Positron Annihilation Lifetime in HgCdTe. Chinese Physics C, 1994, 18(S3): 315-319.
[14]	Weng Huimin , Zhou Xianyi , Xu Jihua , Sun Shijun , Zhu Jingsheng , Wu Shulan , Han Rongdian . Microstructure of Al/GaAs Interface Studied by Slow Positron Beam. Chinese Physics C, 1993, 17(S2): 101-109.
[15]	Zhang Tianbao , Xu Min . State Conversion of Positronium by Oxygen. Chinese Physics C, 1990, 14(S3): 211-218.
[16]	Wang Shuying , Zhang Tianbao , Shentu Yanming , Wang Haidong , Yang Guangming . On the Nature of the Medium Lifetime Component of Positron Annihilation in a Teflon Polymer. Chinese Physics C, 1990, 14(S1): 11-18.
[17]	Chen Jiqiang , Long Qiwei , Zhou Jin , Wang Kelin . Atomic Density Distributions of Grain Boundaries in Metals and Lifetime Spectra Characteristics of Positron Annihilation. Chinese Physics C, 1989, 13(S4): 347-356.
[18]	Xiong Liangyue . A Phenomenological Model for Positron Trapping at Dislocations. Chinese Physics C, 1988, 12(S1): 9-18.
[19]	XU Min , ZENG Xiang-Tao , HUANG Kai-Ping , ZHANG Tian-Bao . EFFECT OF THE ENERGY LOSS PROCESS ON THE ANNIHILATION OF ORTHOPOSITRONIUM IN SILICA AEROGEL. Chinese Physics C, 1988, 12(4): 447-454.
[20]	ZHANG Tian-Bao , WANG Yun-Yu , ZHANG Chang-Chun , WANG Shao-Jie . THE OBSERVATION ON o-P_s ANNIHILATION IN SILICA AEROGEL BY COMBINED SPECTROMETER. Chinese Physics C, 1983, 7(1): 1-4.

Access

Get Citation

WANG Dan-Ni, ZHANG Lan-Zhi, WANG Bao-Yi, YU Run-Sheng, ZHANG Zhi-Ming, LI Dao-Wu and WEI Long. Positronium annihilation in silica aerogel studied by a positron age-momentum correlation technique[J]. Chinese Physics C, 2009, 33(1): 81-84. doi: 10.1088/1674-1137/33/1/017

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

Received: 2008-04-01
Revised: 2008-06-23

Article Metric

Article Views(4028)
PDF Downloads(743)
Cited by(0)

Policy on re-use

To reuse of subscription content published by CPC, the users need to request permission from CPC, unless the content was published under an Open Access license which automatically permits that type of reuse.

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Positronium annihilation in silica aerogel studied by a positron age-momentum correlation technique

Corresponding author: WANG Dan-Ni,

Received Date: 2008-04-01

Accepted Date: 2008-06-23

Available Online: 2009-01-11

Abstract:

A high-performance positron age-momentum correlation (AMOC) spectrometer was newly developed. The counting rate is increased up to 200 cps much larger than the value 20~cps reported by other international groups. And at the same time, the time resolution still keeps at the international level of 220 ps. Furthermore, positronium (Ps) annihilation in silica aerogel was investigated by AMOC, which indicates: (1) Ps annihilation between the grains dominantly undergoes pick-off process and spin conversion from o-Ps to p-Ps; (2) Annealing below 400 ℃ changes the grain surface conditions, i. e. the desorption of hydrogen and the decrease of the defect centers concentration.

HTML

Reference (1)

Positronium annihilation in silica aerogel studied by a positron age-momentum correlation technique

Abstract：

References

Access

Article Metrics

Metrics

通讯作者: 陈斌, bchen63@163.com

Email This Article