搜索结果: 1-15 共查到“positron annihilation”相关记录16条 . 查询时间(0.102 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...
Spatially resolved positron annihilation spectroscopy on friction stir weld induced defects
Spatially resolved positron annihilation spectroscopy friction stir weld induced defects
2010/10/12
A friction stir welded (FSW) Al alloy sample was investigated by Doppler broadening spectroscopy (DBS) of the positron annihilation line. The spatially resolved defect distribution showed that the mat...
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 ...
Is Positron Annihilation in Polyamide 6 Affected by Morphology?
positron Annihilation Polyamide 6 Affected
2009/2/10
Is Positron Annihilation in Polyamide 6 Affected by Morphology?
Estimating the fractional free volume parameter in polyethylene by the positron annihilation method
positron annihilation polymers free volume
2009/2/6
Positron annihilation lifetime measurements were performed on samples made of commercially availablepolyethylene (PE) (Lupolen 2012D, schwarz 413, made by BASF). The samples were isothermallyannealed ...
Positron annihilation study of structural relaxationand crystallization of glassified milk fat
milk fat amorphous crystallinity defect structure
2008/11/13
Kinetics of the milk-fat phase transformations and the features of its defect structure in amorphous, crystalline and liquid states were studied using the positron annihilation technique. The highest ...
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...
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
...
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...
Porosity of sol-gel silica glasses doped by ruthenium bipyridyl as measured by positron annihilation lifetime spectroscopy and nitrogen adsorption
porous glasses ruthenium tris bipyridyl chloride pore size liquid nitrogen adsorption method
2011/4/27
The porous structure of glasses incorporated by ruthenium tris bipyridyl chloride (further Rubpy) and adsorbed by Rubpy is studied by positron annihilation lifetime spectroscopy and liquid nitrogen ad...
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, ...