Measurement of the Gamma Ray Energy in Parapositronium 2γ Decay

ZHANG Tian-Bao; WANG Hai-Dong; SHEN Zhi-Qi

Chinese Physics C> 1991, Vol. 15> Issue(6) : 486-492

Measurement of the Gamma Ray Energy in Parapositronium 2γ Decay

Institute of High Energy Physics,Academia Sinica,Beijing 100080

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Abstract：
Using a silica aerogel sample with oxygen gas introduced as the positronium source,the γ ray energy from the parapositronium 2γ annihilation has been measured as 510998.7(2.5)eV by means of the comparison with the known γ energy 511856.2(2.3)eV of the ¹⁰⁶Ru γ ray.The result,after a revision of the binding energy of positronium,is comparied with the adjusted value of the electron rest mass published in several years ago.

References

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C. Y. Chao, Phys. Rev., 36(1930), 1519.[2] J. W. M. DuMond, D. A. Lind and B. B. Waston, PJeys. Rev., 75(1949), 1226.[3] J. W. Knowles, Proc. 2nd Intern. Conf, on Nuclidic Masses, ed. by W. Johnson, (Springer Verlag, Vienna,1964) p113.[4] B. N. Taylor, W. H. Parker and D. N. Langenbcrq, Rev. Mad. Phys., 41(1969), 375.[5] E. R. Cohen and S. N. Taylor, Journal of Fhys. Chem. Reference Data, V2, N4(1973), 663.[6] K. Fransson, et al., Nucl. Instr. Methods, 138(1976), 479[7] H. Kumabora, H, Inoue and Y. Yoshizawa, Nucl. Instr. Methods, 206(1983), 489.[8] K. Shizuma, H. Inoue and Y. Yoshizawa, Nucl. Instr. Methods, 137(1976), 599.[9] E. R. Cohen, CODATA Bulletin, No, 63 Nev. 1986, 1.[10] 张天保、徐敏, 高能物理与核物理, 14(1990), 289,[11] 徐敏、曾湘涛、黄开平、张天保, 高能物理与核物理, 12(1988), 447.[12] E. G. Kessler, et al, Phys, Rev. lett., 40(1978), 171.

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ZHANG Tian-Bao, WANG Hai-Dong and SHEN Zhi-Qi. Measurement of the Gamma Ray Energy in Parapositronium 2γ Decay[J]. Chinese Physics C, 1991, 15(6): 486-492.

ZHANG Tian-Bao, WANG Hai-Dong and SHEN Zhi-Qi. Measurement of the Gamma Ray Energy in Parapositronium 2γ Decay[J]. Chinese Physics C, 1991, 15(6): 486-492. shu

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

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沈阳化工大学材料科学与工程学院沈阳 110142

Measurement of the Gamma Ray Energy in Parapositronium 2γ Decay

Corresponding author: ZHANG Tian-Bao,

Institute of High Energy Physics,Academia Sinica,Beijing 100080

Received Date: 1900-01-01
Accepted Date: 1900-01-01
Available Online: 1991-06-05

Abstract: Using a silica aerogel sample with oxygen gas introduced as the positronium source,the γ ray energy from the parapositronium 2γ annihilation has been measured as 510998.7(2.5)eV by means of the comparison with the known γ energy 511856.2(2.3)eV of the ¹⁰⁶Ru γ ray.The result,after a revision of the binding energy of positronium,is comparied with the adjusted value of the electron rest mass published in several years ago.