On the consistency between positron annihilation lifetime and Doppler broadening results in polypropylene
نویسندگان
چکیده
منابع مشابه
Positron annihilation studies in binary solid solutions of metal betadiketonates, using lifetime and Doppler broadening spectroscopies
S Positron annihilation lifetime (LS) and Doppler broadening annihilation kadiation lineshape (DBARL) spectroscopies measurements were performed in several binary solid solutions of the general formula M(l-x,Gfx,L3 , where M = Al(II1) , Ga(II1) , or In(II1) , as matrix; G = Cr (111) , Mn (111) , Fe (111) , co (111) , Ru (111) , Rh(III), and Ir(III), as guest molecules, L = acetylacetone (acac) ...
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In this study, a positron annihilation lifetime spectrometer was set up and its resolution was optimized. The spectrometer is a fast-slow arrangement with time resolution of 250 ps. To obtain lifetime components and their intensities from analyzing positron annihilation lifetime spectrum, the Pascual software is used. Positrons are from a source of radioactive 22NaCl with 20 μCi activity enclos...
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We report the first observation of electron momentum contributions to the Doppler broadening of radiation produced by in-flight two-photon annihilation in solids. In these experiments an approximately 2.5 MeV positron beam impinged on thin polyethylene, aluminum, and gold targets. Since energetic positrons easily penetrate the nuclear Coulomb potential and do not cause a strong charge polarizat...
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چکیده شخصیت به مجموعه عوامل روانی، عقلی، احساسی، و فیزیکی تشکیل دهنده یک فرد اطلاق میشود، خصوصا فرد ازدیدگاه دیگران ( مرجع). تدابیر یاد گیری سعی در اگاهی از اقدامات زبان اموزان موفق زبان دوم یا یک زبان بیگانه را دارد که توسط خود زبان اموزان گزارش میشود،یا حین یادگیری زبان دوم یا زبان بیگانه از انها قابل مشاهده است( روبین و وندن 1987). همچنین تدابیر ارتباطی به زبان اموزان کمک می کند تا بر مشکلا...
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ژورنال
عنوان ژورنال: physica status solidi (c)
سال: 2007
ISSN: 1862-6351,1610-1642
DOI: 10.1002/pssc.200675732