搜索结果: 1-11 共查到“理学 Positron Annihilation”相关记录11条 . 查询时间(0.14 秒)
Positron annihilation in the MuPs system
Positron annihilation the MuPs system Atomic Physics
2011/8/17
Abstract: The life-time of the four-body atomic system MuPs ($\mu^{+} e^{-}_2 e^{+}$ or muonium-positronium) against positron annihilation has been evaluated as $\tau = \frac{1}{\Gamma} \approx 4.0763...
Positron annihilation spectrum from the Galactic Centre region observed by SPI/INTEGRAL, revisited: annihilation in a cooling ISM?
High Energy Astrophysical Phenomena (astro-ph.HE)
2010/12/24
We analyse SPI/INTEGRAL data on the 511 keV line from the Galactic Centre, accumulated over ~6 years of observations.
Strong coupling，charm- and bottom-quark masses from electron-positron annihilation
strong coupling quark masses
2010/5/7
The cross section for electron-positron annihilation into hadrons allows for a precise determination of the strong coupling constant and the charm- and bottom-quark masses. Recent theoretical and expe...
Identification of pore size in porous SiO2 thin film by positron annihilation
Al-Si thin film porous SiO2 thin film positron annihilation
2009/8/14
Positron annihilation lifetime and Doppler broadening of annihilation line techniques have been used to obtain information about the small pore structure and size of porous SiO2 thin film produced by ...
专著信息
书名
Undoped Gallium Antimonide Studied by Positron Annihilation Spectroscopy
语种
英文
撰写或编译
作者
S.K. Ma,C.C. Ling,H.M. Weng,and D.S. Hang
第一作者单位
出版社
Mat. Res. Soc. Symp. Proc. 799, Z5.30.1 (2004)
出版地
...
Microstructure of carbon filled HDPE/EPDM composites studied by positron annihilation spectroscopy
2007/7/28
专著信息
书名
Microstructure of carbon filled HDPE/EPDM composites studied by positron annihilation spectroscopy
语种
英文
撰写或编译
作者
H.M. Weng,S.J. Jia,B.J. Ye,X.F. Zhang,R.D. Han,H.Y. Wang,X.Y. Zhou,Z.C. Zhang,...
Vacancies in electron irradiated 6H silicon carbide studied by positron annihilation spectroscopy
2007/7/28
专著信息
书名
Vacancies in electron irradiated 6H silicon carbide studied by positron annihilation spectroscopy
语种
英文
撰写或编译
作者
C.H. Lam,C.C. Ling,H.M. Weng,Deng-sheng Hang,C.D. Beling,S. Fung,
第一作者单位
出版社
Ma...
Study of the Doppler Broadening of Positron Annihilation Radiation in Silicon
the Doppler Broadening Positron Annihilation Radiation Silicon
2010/10/15
We report the measurement of Doppler broadening annihilation radiation in silicon, using 22Na as a positron source, and two Ge detectors arrangement. The two-dimensional coincidence energy spectrum wa...
Study of the Electron-Positron Annihilation Coincidence Peak Two-Dimensional Profile
the Electron-Positron Annihilation Coincidence Peak Two-Dimensional Profile aluminum Ge detectors
2010/10/26
Positron annihilation radiation profile in aluminum was observed with a pair of Ge detectors in coincidence. 22Na was used as a source of positron and the two-dimensional gamma energy spectrum was fit...
Formation Energy in Al-Mg Alloy by Positron Annihilation Lifetime Technique (PALT)
Lifetime formation enthalpy point defects in Al-Mg alloys
2010/4/13
The propose of the present work is to study the interaction of positrons with quenched-in defects and clustered atoms to estimate formation enthalpy in series 50xx of commercial Al-Mg alloys, namely, ...
Positron Annihilation and XRD Studies on Deformed Al-Alloys with low concentration of Mg
Positron Annihilation Al-Alloys Mg
2010/4/15
Positron behaviour at grain boundaries is characterized by their bulk diffusibility D, their bulk free lifetime tf and their trapped lifetime tt (tt > tf). Al-Mgx samples (x = 0-1.4 at %) have been ho...