Science, Том 218John Michels (Journalist) American Association for the Advancement of Science, 1982 Since Jan. 1901 the official proceedings and most of the papers of the American Association for the Advancement of Science have been included in Science. |
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Стр. 335
... positron and an elec- tron can annihilate into y - ray photons , the otherwise stable positron decays in Allen P. Mills , Jr. Positron annihilation offers a unique probe for detecting vacancies in metals ( 4 ) , for measuring the Fermi ...
... positron and an elec- tron can annihilate into y - ray photons , the otherwise stable positron decays in Allen P. Mills , Jr. Positron annihilation offers a unique probe for detecting vacancies in metals ( 4 ) , for measuring the Fermi ...
Стр. 336
... positron negative work function of the surface ( 20 ) . This new understanding has led to moderators with conversion efficiencies better than 10-3 . The resulting beam strengths of more than 10o positrons per second with nearly thermal ...
... positron negative work function of the surface ( 20 ) . This new understanding has led to moderators with conversion efficiencies better than 10-3 . The resulting beam strengths of more than 10o positrons per second with nearly thermal ...
Стр. 339
... Positron Beams In order to improve the beam charac- teristics we must evidently not rely on conservative forces . Rather , the initial beam can be accelerated to , say , 10 keV and brought to focus in a 0.1 - mm spot on a second slow ...
... Positron Beams In order to improve the beam charac- teristics we must evidently not rely on conservative forces . Rather , the initial beam can be accelerated to , say , 10 keV and brought to focus in a 0.1 - mm spot on a second slow ...
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