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THE DISINTEGRATION OF SILICON BY FAST NEUTRONS

Technical Report ·
OSTI ID:4663795
The Si/sup 28/(n,p)Al/sup 28/, Si/sup 28/(n, alpha )Mg/sup 25/, and Si/ sup 29/(n, a)Mg/sup 26/ reactions were observed in a silicon solid state detector with a barrier depth equivalent to the range of a 7.5-Mev proton. A yield curve for the reactions was measured between neutron energies of 4.6 and 8.5 Mev with an energy spread between 80 and 40 kev. At E/sub n/ = 8.5 Mev, transitions to two levels of Mg/sup 26/, four of Mg/sup 25/ and nine of Al/sup 28/ were observed. In the disintegration of Si/sup 28/, strong resonant structure was observed and below E/sub n/ = 6 Mev, both reactions are strongly inhibited by the coulomb barrier. Charged particle penetrability calculations predict the relative magnitudes of the Si/sup 28/ (n, alpha ) and (n,p) reaction cross sections. A fast neutron spectrometer using a Si/sup 29/ solid state counter is proposed. (auth)
Research Organization:
Rice Univ., Houston, Tex.
NSA Number:
NSA-17-034884
OSTI ID:
4663795
Report Number(s):
TID-19047; CONF-13-6
Country of Publication:
United States
Language:
English

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