Improved Measurement of γ-Energy from Parapositronium 2γ-Decay

Peng Liangqiang; Zhang Tianbao; Wang Haidong; Meng Bonian; Yin Guoli

Chinese Physics C> 1995, Vol. 19> Issue(11) : 987-990

Improved Measurement of γ-Energy from Parapositronium 2γ-Decay

Application Division,Institute of High Energy Physics,The Chinese Academy of Sciences,Beijing 1000801 EG&G Ortec INC.,Beijing Office

Abstract
HTML
Reference
Related

PDF

Abstract：
Using a silica aerogel sample with oxygen gas filled as the positronium(Ps)source and a time selecting energy spectrometer,the measurement of the y-energy of parapositronium(p-Ps)2y-decay is further improved and the result of hv=510995. 34±0.69eV is obtained by a slithering comparison with the precisely known y-energies of ¹⁹²Ir.The rest mass of a pair of positron and electron is determined by the correction with the binding energy of Ps,which shows a mass equality within 1.4ppm between positron and electron by the comparison with the rest mass of electron.

References

[1]

E.R.Cohen,B.N.Taylor,Rev.Modern.iPhys/i,59（1987）1121.[2] R.Lewis,Elementary Particles and Symmetries,Gardon and Breach（1975）.[3] 张天保、王海东、沈智奇，高能物理与核物理，15（1991）486.[4] 张天保等，中国科学，A9（1992）970.[5] 张天保、徐敏，高能物理与核物理，14（1990）289.[6] T.B.Chang et al,iNucl/i.Instr.Methode,A325（1993）196.[7] 张天保，物理，4（1990）228.[8] R.D.Deslatts et al,Ann.iPhys/i,129（1980）378.

[1]	LI Qiong , XIA Bing-Shu , LUO Yan-An , PAN Feng , NING Ping-Zhi . SD Pair Shell Model: Collectivity of Low-Lying State for Even-Even Pt Isotopes. Chinese Physics C, 2006, 30(9): 854-857.
[2]	DAI Jian-Ping . Adjustment of Energy of BFEL Linac. Chinese Physics C, 2006, 30(S1): 93-95.
[3]	JIANG Xiao-Guo , YANG Guo-Jun , ZHANG Kai-Zhi , SHI Jin-Shui , DENG Jian-Jun , WANG Yuan , LI Cheng-Gang . Time-Resolved Measurement System Using Optical Transition Radiation for Electron Beam of High Energy and High Current. Chinese Physics C, 2005, 29(11): 1095-1099.
[4]	LI Zhi-Hui , DAI Jian-Ping , YANG Xue-Ping , FAN Yao-Hui , XIE Jia-Lin , ZHU Jun-Biao . Analysis and Calculation on Electron Bunch Length Measurement by Using CTR. Chinese Physics C, 2003, 27(9): 831-835.
[5]	GU An-Jia , DING Yuan-Tao , ZHAO Kui , ZHANG Bao-Cheng , QUAN Sheng-Wen , LU Xiang-Yang , CHEN Jia-Er . A New Measurement of Electron Beam Emittance with Cerenkov Radiation “Double Imaging” Method. Chinese Physics C, 2003, 27(2): 163-168.
[6]	XU Yan-Bing , LIAO Ji-Zhi . Studies on the HF States and the Negative-Parity Spectra of Even Even Cd Nuclei. Chinese Physics C, 2003, 27(2): 142-146.
[7]	ZHOU Chun-Mei , HUANG Xiao-Long , WU Zhen-Dong . Internal Conversion Electron Energies and Their Absolute Intensities Calculation. Chinese Physics C, 2002, 26(2): 148-151.
[8]	XU Yan-Bing , YANG Wei-Fan , YUAN Shuang-Gui , XIAO Yong-Hou , PAN Qiang-Yan , LI Ying-Jun . Measurement of the Cross Sections for Ba Isotopes. Chinese Physics C, 2002, 26(6): 589-593.
[9]	HU Hai-Ming , QI Xiang-Rong , HUANG Guang-Shun , ZHAO Zheng-Guo . Initial State Radiative Correction in R Measurement at BES. Chinese Physics C, 2001, 25(8): 701-709.
[10]	Zhong Jiquan , Zhang Xueqian . Non-axial Parameter γ Effects on Even-Even Er Isotopes. Chinese Physics C, 1997, 21(2): 176-179.
[11]	Qian Chengde . Effects of Positive-Parity States Octupole Correlations for Even-Even Nuclei in Rotational Regions. Chinese Physics C, 1994, 18(5): 473-480.
[12]	Sang Jianping , Liu Yong . The Microscopic Investigation of High-Spin States for Even-Even Nuclei(III)Application to isotopes ¹²⁶Ba,¹²⁸Ba and ¹³⁰Ba. Chinese Physics C, 1994, 18(12): 1102-1106.
[13]	Liu Bo , Zhao Weiqin . Contribution Due to Gluon Shadowing and Final-State Interactions to Charmonium/Bottonium Suppression in h-A Collisions. Chinese Physics C, 1994, 18(5): 443-447.
[14]	Zhang Dali , Liu Yuxin , Han Qizhi . An IBM2 Description on the Low-lying States of Even-even Xe Isotopes. Chinese Physics C, 1994, 18(12): 1130-1136.
[15]	CHENG Zi-Tao , QIAN Qing , FU Yun-Chang , CHEN Xue-Jun . Study of Antihydrogen Atom Formation in Collisions of Antiprotons with Positronium. Chinese Physics C, 1993, 17(5): 448-454.
[16]	ZHANG Tian-Bao , WANG Hai-Dong , SHEN Zhi-Qi . Measurement of the Gamma Ray Energy in Parapositronium 2γ Decay. Chinese Physics C, 1991, 15(6): 486-492.
[17]	CAO Zhong , LIU Wei-Ren , WANG Li-Lie , XIE Shi-Liang , JIANG Li-Ping , DING Mei-Song , ZHAO Ji-Lai , REN You-Lai , SHAN Bing , ZHAO Zheng , CUI Ming-Qi . SHAPE MEASUREMENT OF SYNCHROTRON RADIATION WITH HIGH TIME RESOLUTION. Chinese Physics C, 1990, 14(8): 677-683.
[18]	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.
[19]	ZHANG Tian-Bao , TANG Xiao-Wei , WANG Yun-Yu , LI Yao-Qing , YIU Ke , WANG Shao-Jie . MEASUREMENT OF THE WHOLE GAMMA-RAY ENERGY SPECTRUM IN o-Ps 3 GAMMA-DECAY. Chinese Physics C, 1984, 8(4): 385-391.
[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

Peng Liangqiang, Zhang Tianbao, Wang Haidong, Meng Bonian and Yin Guoli. Improved Measurement of γ-Energy from Parapositronium 2γ-Decay[J]. Chinese Physics C, 1995, 19(11): 987-990.

Peng Liangqiang, Zhang Tianbao, Wang Haidong, Meng Bonian and Yin Guoli. Improved Measurement of γ-Energy from Parapositronium 2γ-Decay[J]. Chinese Physics C, 1995, 19(11): 987-990. shu

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

Received: 1900-01-01
Revised: 1900-01-01

Article Metric

Article Views(2541)
PDF Downloads(509)
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

Improved Measurement of γ-Energy from Parapositronium 2γ-Decay

Corresponding author: Peng Liangqiang,

Application Division,Institute of High Energy Physics,The Chinese Academy of Sciences,Beijing 1000801 EG&G Ortec INC.,Beijing Office

Received Date: 1900-01-01
Accepted Date: 1900-01-01
Available Online: 1995-11-15

Abstract: Using a silica aerogel sample with oxygen gas filled as the positronium(Ps)source and a time selecting energy spectrometer,the measurement of the y-energy of parapositronium(p-Ps)2y-decay is further improved and the result of hv=510995. 34±0.69eV is obtained by a slithering comparison with the precisely known y-energies of ¹⁹²Ir.The rest mass of a pair of positron and electron is determined by the correction with the binding energy of Ps,which shows a mass equality within 1.4ppm between positron and electron by the comparison with the rest mass of electron.