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- W2055340524 abstract "The energy distribution of the neutrons emitted when beryllium, boron and carbon are bombarded by 0.9 MEV deuterons has been investigated. The neutrons from beryllium are attributed to the reaction $_{4}mathrm{Be}^{9}+_{1}mathrm{H}^{2}ensuremath{rightarrow}_{5}mathrm{B}^{10}+_{0}n^{1}+{Q}_{1}.$ The energy of disintegration ${Q}_{1}$ is 4.25ifmmodepmelsetextpmfi{}0.2 MEV. Several lower energy neutron groups attributed to excited ${mathrm{B}}^{10}$ nuclei were observed with $Q$'s equal to 3.7, 2.1 and 0.8 MEV. The neutrons observed when boron is bombarded by deuterons are attributed to the reactions: ${_{5}mathrm{B}^{11}+_{1}mathrm{H}^{2},ensuremath{rightarrow}_{6}mathrm{C}^{12}+_{0}n^{1}+{Q}_{2},}{_{5}mathrm{B}^{11}+_{1}mathrm{H}^{2},ensuremath{rightarrow}3_{2}mathrm{He}^{4}+_{0}n^{1}+{Q}_{3},}{_{5}mathrm{B}^{10}+_{1}mathrm{H}^{2},ensuremath{rightarrow}_{6}mathrm{C}^{11}+_{0}n^{1}+{Q}_{4}.}$ The most probable of these is reaction (3); it gives rise to a group of neutrons with a continuous distribution of energies below 3 MEV. The disintegration energies observed from the other two reactions are: ${{{Q}_{2}}^{0}=13.5ifmmodepmelsetextpmfi{}0.3 mathrm{MEV}, ,{{Q}_{4}}^{0}=6.2ifmmodepmelsetextpmfi{}0.2 mathrm{MEV},}{{{Q}_{2}}^{1}=9.1ifmmodepmelsetextpmfi{}0.2 mathrm{MEV}, ,{{Q}_{4}}^{1}=4.0ifmmodepmelsetextpmfi{}0.1 mathrm{MEV}.}$ The neutrons observed when carbon is bombarded by deuterons are attributed to the reactions: ${_{6}mathrm{C}^{12}+_{1}mathrm{H}^{2},ensuremath{rightarrow}_{7}mathrm{N}^{13}+_{0}n^{1}+{Q}_{5},}{_{6}mathrm{C}^{13}+_{1}mathrm{H}^{2},ensuremath{rightarrow}_{7}mathrm{N}^{14}+_{0}n^{1}+{Q}_{6}.}$ It is found that reaction (5) is responsible for approximately 99 percent of the neutrons from carbon and that reaction (6) is responsible for the remainder. The values of the disintegration energies are: ${Q}_{5}=ensuremath{-}0.37ifmmodepmelsetextpmfi{}0.05 mathrm{MEV} mathrm{and} {Q}_{6}=5.2ifmmodepmelsetextpmfi{}0.4 mathrm{MEV}.$ The calculated value of the maximum energy of the positrons from ${mathrm{N}}^{13}$ is 1.16 MEV which is lower than the Konopinski-Uhlenbeck extrapolated value of 1.45 MEV. A complete set of values of the masses of the light elements computed from disintegration data is given." @default.
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- W2055340524 date "1936-08-15" @default.
- W2055340524 modified "2023-09-24" @default.
- W2055340524 title "Disintegration of Beryllium, Boron and Carbon by Deuterons" @default.
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- W2055340524 doi "https://doi.org/10.1103/physrev.50.308" @default.
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