Charged particle multiplicities in heavy-ion-induced fission

Journal Article · Sun Nov 01 04:00:00 EST 1992 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.46.1922· OSTI ID:6948416

Ikezoe, H; Shikazono, N; Nagame, Y; Sugiyama, Y; Tomita, Y; Ideno, K; Nishinaka, I; Qi, B J; Kim, H J; Iwamoto, A ^[1]; Ohtsuki, T ^[2]

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1. Department of Physics, Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki-ken 319-11 (Japan)
2. Laboratory of Nuclear Science, Tohoku University, Sendai-shi, Miyagi-ken 982 (Japan)

Pre- and post-scission protons and {alpha} particles are measured in the {sup 16}O+{sup 197}Au, {sup 19}F+{sup 181}Ta, {sup 197}Au and {sup 208}Pb, and {sup 28}Si+{sup 197}Au and {sup 208}Pb reactions in the compound nucleus excitation energy range of 43 to 117 MeV. The angular correlation measurements between {alpha} particles and fission fragments suggest that the pre-scission {alpha} particles seem to be mainly emitted from spherical compound nuclei or nuclei in an early stage of the fission process before saddle. The pre-scission multiplicities of protons and {alpha} particles are compared to the statistical model calculations and are reproduced by assuming the ratio {ital a}{sub {ital f}}/{ital a}{sub {ital n}} of the saddle point deformation to the ground-state deformation within the limit of 1.00 to 1.02. The post-scission protons and {alpha} particles are consistent with the evaporations from the fission fragments whose excitation energies are considerably reduced by the pre-scission neutron emissions.

• OSTI ID: 6948416
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 46:5; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

663450* -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
663570 -- Nuclear Mass Ranges-- A=150-189-- (1992-)
663580 -- Nuclear Mass Ranges-- A=190-219-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA SPECTRA
ANGULAR DISTRIBUTION
CHARGED-PARTICLE REACTIONS
COMPOUND-NUCLEUS REACTIONS
DATA
DISTRIBUTION
ENERGY RANGE
EXPERIMENTAL DATA
FLUORINE 19 REACTIONS
GOLD 197 TARGET
HEAVY ION REACTIONS
INFORMATION
LEAD 208 TARGET
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
NUMERICAL DATA
OXYGEN 16 REACTIONS
PROTON SPECTRA
SILICON 28 REACTIONS
SPECTRA
TANTALUM 181 TARGET
TARGETS