Emission of light charged particles in photon induced fission

Details Emission of light charged particles in photon induced fission Emission of light charged particles in photon induced fission

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phrvc..49..991v&link_type=abstract

Physical Review C (Nuclear Physics), Volume 49, Issue 2, February 1994, pp.991-1000

Physics

Nuclear Physics

3

Photofission, 220<=A

Scientific paper

The emission of light charged particles in the photofission of 230,232Th, 233,234,235,238U, 237Np, and 242Pu has been studied with bremsstrahlung with end-point energy of 12, 15, and 20 MeV. The light charged particles are measured using a setup consisting of eight ΔE-E particle identification detector telescopes. The kinetic energy distributions and the emission probabilities of tritons and long-range alpha particles were determined. The presence of photoprotons obscures the identification of ternary protons while 6He particles were observed clearly, however, with insufficient statistics to allow meaningful conclusions concerning their energy distribution or emission probability. The average kinetic energy of the ternary tritons and α particles and the width of the triton kinetic energy distributions seems to be practically independent of the compound nucleus excitation energy or Z2/A. Only the width of the long-range alpha particle kinetic energy distribution shows a slight increase with increasing Z2/A of the compound nucleus. Our results point toward a slight increase of the ternary alpha particle yield with increasing excitation energy of the compound nucleus. As already observed by Wild et al. for spontaneously fissioning nuclei, this yield shows a clear correlation with -, where E*tot is the total kinetic energy, suggesting that the light charged particle emission probability is determined by the deformation of the system at scission, and that, for the compound nucleus excitation energy studied in our experiments, the excitation energy transferred to the compound nucleus remains in the system as internal heat, and is not transformed into deformation energy. The triton emission to binary fission ratio, t/B, for 237Np is not substantially higher than for the neighboring nuclei, indicating that the unpaired proton in 237Np does not influence in an important way the triton emission probability.

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