Rare Nuclear Reactions Induced by 14.7-MeV Neutrons
作者： E. T. Bramlitt , R. W. Fink
关键词: Neutron 、 Niobium-93 、 Analytical chemistry 、 Half-life 、 Alpha particle 、 Large target 、 Nuclear reaction 、 Helium-3 、 Physics 、 Atomic physics 、 Proton spectra 、 General Physics and Astronomy
摘要: Activation cross sections for 14.7 plus or minus 0.2-Mev neutrons were measured STA(n,n alpha ) + (n, n)! reactions with Cu/sup 65/ Zn/sup 70/ , Ga/sup 71/, and Nb/sup 93/, while upper limits set this reaction V/ sup 51/, Ge/sup 76/, Br/sup 81/, Rb/sup 87/, Ag/sup 107/, Ag/su p 109/, In/sup 115/, Au/sup 197/, Tl/sup 203/. Cross-section also (n,2p) on Si/sup 29/, K/sup 41/, Sc/sup 45/, Ti/sup 50/, V/sup Mn/ 55/, As/sup 75/, Y/sup 89/, Cs/sup 133/, La/sup 139/, Pr/sup 141/ Tb/sup 159/; (n,He/sup 3/) Au/ 205/. Cross dete rmined gamma 141, limi ts (n,3n) 141/, 203. The ISTAn,np) (n,np)! was detected Ni/sup 58/, but not Mo/sup 92/ . A value of 520 120 mb established the former, an limit latter. Absolute disintegration rates obtained by both beta spectroscopymore » counting methods. Extensive use radiochemical separation made in order to isolate low-yield rare products from large target samples. Statistical theory employed (using parameters selected a critical analysis literature) make theoretical section estimates many studied. n) agree remarkably well experimentally determined sums, thereby suggesting that path may be predominantly process. For certain cases, statistical predicts appreciable at Mev; e.g., Cr/sup Kr/sup 78/, It is suggested studies emitted proton spectra which show excess low-energy protons, contribution present as (n,np) reaction. new 176 4 kev about 5% 1.8-day 48/ decays confirmed. (auth)« less
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