Fission uranium 238 generator#
Fission uranium 238 plus#

From this it is concluded that the rotation energy is small and even though the moments of inertia of the symmetrically and asymmetrically fissioning nuclei are different, this difference does not affect markedly the rotational energy. The results indicated that for both symmetric and asymmetric fission product masses the kinetic energy of the products remains unchanged as the angle is varied.

Fission uranium 238 generator#

A 150 mu g/cm/sup 2/ thick uranyl acetate layer deposited on an aluminized film was used for the tests a neutron generator and a synchrotron served as the bombarding source. The most probable total kinetic more » energy at various given mass ratios of the fission products was determined for 5 integrals of the angle between the direction of the emission of the fission products and that of the neutron beam or gamma -quanta by recording 3 pulses for each fission. Measurements were made to determine the energy and angalar distribution of the products resulting from the fission of U/sup 238/ by 14- Mev neutrons and by photons with an E/sub max/, = 35 Mev, using a double-pulse type ionization chamber. The factors studied include the excitation energy of the fissioning atom, the yield of the products, the angular distribution, and the effect of the spin state of the component nuclei. (auth) « lessĪ study was made to determine whether the creation of symmetric and asymmetric fission products is or is not due to the same fission mechanism. and with photofission data when the effect on the fission barrier of the meson( mu ) in the 1S state of the mesic atom is taken into consideration. The number of fissions observed can be made quantitatively consistent with the resuits of Muknin et al. Resuits of measurements in this report indicate such direct nuclear excitation.

This intensity reduction is qualitatively consistent with earlier predictions more » that, for these elements, a direct excitation of the nucleus competes with electromagnetic radiation in the transition to the ground state of the mesic atom.

Fission uranium 238 plus#

shows that the intensities of mu -mesic K x rays for these elements relative to Pb are 0.85 plus or minus 0.0 (Th/sup 232/), 0.77 plus or minus 0.04 (U/sup 238/), and 0.71 plus or minus 0.05 (U.sup 235/). A significant number of prompt fissions that are not associated with meson( mu /sup -/) nuclear capture were observed.

The time distribution of fissions in Th/sup 232/,U/sup 235/, and U/sup 238/ induced by mesons( mu /sup -/) was measured with a multiplate gas- scintillation fission chamber.