Experimental search for low energy nuclear excitation by femtosecond plasmaстатья
Статья опубликована в высокорейтинговом журнале
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 5 декабря 2014 г.
Аннотация:New experimental data on the secondary electron yield from a thin layer of 57Fe irradiated by emission of the hot dense plasma source created by femtosecond laser pulses with intensity of 1017 W cm−2 is presented. Plasma source hard x-ray and electron fluxes are measured for the source characterization. Thorough statistical analysis of the delayed secondary electron spectrum from the 57Fe layer in the 20–100 ns temporal window allows exclusion of the 'null' hypothesis of the random character of the differences of this spectrum with that obtained using a 56Fe target. Thus, statistically valid maxima at ~5.8 and 7.4 keV can be attributed to the decay of the isomeric nuclear state of 57Fe (3/2−, 14.41 keV, 98 ns) by the internal conversion process through the atomic K-shell (maximum at 7.4 keV), followed by the Auger process (maximum at 5.8 keV).