Neutron spectra in reactions with cascade evaporation of particles and the nuclear level density
Journal Article
·
· Sov. J. Nucl. Phys. (Engl. Transl.); (United States)
OSTI ID:5123660
We present the results from calculations of the neutron spectra in the reactions /sup 181/Ta(..cap alpha.., xn), /sup 181/Ta(p, xn), and /sup 238/U(n, xn) at incident energies E/sub ..cap alpha../ = 45 MeV for ..cap alpha.. particles, E/sub p/ = 22 MeV for protons, and E/sub n/ = 14 MeV for neutrons, respectively. The calculations are carried out in the particle cascade evaporation model taking into account the angular momentum and the competition between protons, ..cap alpha.. particles, and photons at each stage of the evaporation cascade. The accuracy of the simple approximations used to describe the particle spectra in these processes is analyzed. It is noted that decay via the radiation channel becomes dominant in the final stages of the evaporation cascade. It is shown that the use of simplified approaches can lead to erroneous values of the level density parameters, depending on the region where they are determined and on the contribution of the angular momenta participating in the reaction. The results are compared to the experimental data.
- Research Organization:
- Joint Institute for Nuclear Research
- OSTI ID:
- 5123660
- Journal Information:
- Sov. J. Nucl. Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Nucl. Phys. (Engl. Transl.); (United States) Vol. 35:2; ISSN SJNCA
- Country of Publication:
- United States
- Language:
- English
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Journal Article
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· Sov. J. Nucl. Phys. (Engl. Transl.); (United States)
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Related Subjects
651815* -- Nuclear Properties & Reactions
A=150-189
Theoretical-- Nuclear Reactions & Scattering-- (-1987)
652015 -- Nuclear Properties & Reactions
A=220 & above
Theoretical-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA REACTIONS
BARYON REACTIONS
CHARGED-PARTICLE REACTIONS
ENERGY RANGE
EVAPORATION MODEL
HADRON REACTIONS
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
NEUTRON REACTIONS
NEUTRON SPECTRA
NUCLEAR CASCADES
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEON REACTIONS
PROTON REACTIONS
SPECTRA
TANTALUM 181 TARGET
TARGETS
URANIUM 238 TARGET
A=150-189
Theoretical-- Nuclear Reactions & Scattering-- (-1987)
652015 -- Nuclear Properties & Reactions
A=220 & above
Theoretical-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA REACTIONS
BARYON REACTIONS
CHARGED-PARTICLE REACTIONS
ENERGY RANGE
EVAPORATION MODEL
HADRON REACTIONS
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
NEUTRON REACTIONS
NEUTRON SPECTRA
NUCLEAR CASCADES
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEON REACTIONS
PROTON REACTIONS
SPECTRA
TANTALUM 181 TARGET
TARGETS
URANIUM 238 TARGET