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- W2057650812 abstract "The angular distribution of long-range alpha particles from ternary fission induced by 17.5-MeV protons incident on ${mathrm{U}}^{238}$ has been measured with respect to both the fission-fragment axis and the beam direction. For alpha particles emitted perpendicularly to the fragment direction, the distributions are found to be independent of the azimuthal angle about the fission-fragment separation axis and independent of the angle with respect to the incident beam. The angular distribution of ternary-fission fragments is nearly identical to that of binary-fission fragments resulting from the same initial system of fissioning nuclei. These results are compatible with a mechanism in which nuclei undergoing ternary fission are quite similar to those undergoing binary fission. A comparison was made of the angular correlation of long-range alpha particles and fission fragments for proton-induced fission of ${mathrm{U}}^{238}$ and spontaneous fission of ${mathrm{Cf}}^{252}$. When no differentiation is made between light and heavy fragments, the full widths at one-half maximum are 47ifmmodepmelsetextpmfi{}12ifmmode^circelsetextdegreefi{} and 33ifmmodepmelsetextpmfi{}2ifmmode^circelsetextdegreefi{}, respectively. Also the former system shows an unexpectedly large number of alpha particles emitted along the direction of the fragment separation axis. A ternary-to-binary fission ratio of (2.7ifmmodepmelsetextpmfi{}0.6)ifmmodetimeselsetexttimesfi{}${10}^{ensuremath{-}3}$ for ${mathrm{U}}^{238}$ plus 17.5-MeV protons was obtained from these measurements. The reported increase of the ternary-to-binary ratio at high excitation energies does not appear to depend in a simple way on the angular momentum of the initial compound nucleus. The binary-fission measurements yielded a fission cross section of 0.9 b and an angular anisotropy [$frac{W(0)}{W(90ifmmode^circelsetextdegreefi{})}$] of 1.12." @default.
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- W2057650812 date "1965-07-26" @default.
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- W2057650812 title "Emission of Long-Range Alpha Particles in the Fission ofU238with 17.5-MeV Protons" @default.
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- W2057650812 doi "https://doi.org/10.1103/physrev.139.b307" @default.
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