Chinese Physics C > 1983, Vol. 7 > Issue(1): 1-4

THE OBSERVATION ON o-P_sANNIHILATION IN SILICA AEROGEL BY COMBINED SPECTROMETER

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Abstract：
The yields and energy spectra of the various components of o- P_sannihilation in silica aerogel are observed using the combined spectrometer. It is shown that the processes of P_sformation and annihilation in ultrafine grains of SiO ₂aerogel are basically consistent with the diffusion model, but the grain surface effect can not be neglected. Comparing the Dopplar broadening spectra, it is understood that the pick-off process of the longest component possesses the lower annihilation momentum than that of the free positron annihilation.

References

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R. Paulin and G. Ambrosino, J. Phys., Paris., 29(1968), 263.[2] M.Debswsha. J. Kukulka and J. Wesolowski, Acta Physica Polonict VA48-N4(1975), 538.[3] S. Y. Chuang and S. J. Tao, Canadian J. Phys., 51(1973), 820.[4] D. W. Gidley, E. A. Marko and A. Rich, Phys. Rev. Lett., 36(1976), 395.[5] W. Brandt and R. Paulin, Phys. Rev. Lett., 21(1968), 193.

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ZHANG Tian-Bao, WANG Yun-Yu, ZHANG Chang-Chun and WANG Shao-Jie. THE OBSERVATION ON o- P _sANNIHILATION IN SILICA AEROGEL BY COMBINED SPECTROMETER[J]. Chinese Physics C, 1983, 7(1): 1-4.

ZHANG Tian-Bao, WANG Yun-Yu, ZHANG Chang-Chun and WANG Shao-Jie. THE OBSERVATION ON o- P _sANNIHILATION IN SILICA AEROGEL BY COMBINED SPECTROMETER[J]. Chinese Physics C, 1983, 7(1): 1-4. 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

THE OBSERVATION ON o-P_sANNIHILATION IN SILICA AEROGEL BY COMBINED SPECTROMETER

Corresponding author:ZHANG Tian-Bao,

Received Date:1900-01-01
Accepted Date:1900-01-01
Available Online:1983-02-05

Abstract:The yields and energy spectra of the various components of o-P_sannihilation in silica aerogel are observed using the combined spectrometer. It is shown that the processes ofP_sformation and annihilation in ultrafine grains of SiO₂aerogel are basically consistent with the diffusion model, but the grain surface effect can not be neglected. Comparing the Dopplar broadening spectra, it is understood that the pick-off process of the longest component possesses the lower annihilation momentum than that of the free positron annihilation.