Alpha-particle energy spectra from the (p,/alpha/) reaction on nuclei around atomic number 50
The energy spectra of /alpha/ particles emitted from (p,/alpha/) reactions on /sup 112/Cd, /sup 118/Sn, /sup 120/Sn, Sb, /sup 128/Te, and /sup 130/Te with 18 MeV protons have been measured in order to clarify the shell and odd-even effects in the preequilibrium processes of (p,/alpha/) and (n,/alpha/) reactions. From the experimental results, it was found that there exist no appreciable shell and odd-even effects on target nuclei in the gross (p,/alpha/) energy spectra lower than 20 MeV in the preequilibrium process. They can be explained well by the /alpha/ knockout model using the effective Q values which are shell independent. The fine structures of the energy spectra for the (p,/alpha/) reactions on nuclei around atomic number 50 can be qualitatively explained using the three-nucleon pickup model under the assumption that the states excited in the (p,/alpha/) reaction are formed by the coupling of two-neutron-hole states excited in the reaction such as the (p,t) reaction and one-proton-hole states excited in the reaction such as the (d,/sup 3/He) reaction. The similar three-nucleon pickup model can explain qualitatively the fine structures of the energy spectra for the (n,/alpha/) reactions on nuclei around neutron numbers 50 and 82.
- Research Organization:
- Department of Nuclear Engineering, Kyushu University, Fukuoka 812, Japan
- OSTI ID:
- 6935179
- Journal Information:
- Phys. Rev. C; (United States), Vol. 38:6
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ANTIMONY
PROTON REACTIONS
CADMIUM 112 TARGET
COMPOUND-NUCLEUS REACTIONS
PICKUP REACTIONS
TELLURIUM 128 TARGET
TELLURIUM 130 TARGET
TIN 118 TARGET
TIN 120 TARGET
ALPHA PARTICLES
ALPHA SPECTRA
ANGULAR DISTRIBUTION
MEV RANGE 10-100
PARTICLE-HOLE MODEL
PRECOMPOUND-NUCLEUS EMISSION
Q-VALUE
VAN DE GRAAFF ACCELERATORS
ACCELERATORS
BARYON REACTIONS
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
DIRECT REACTIONS
DISTRIBUTION
ELECTROSTATIC ACCELERATORS
ELEMENTS
ENERGY
ENERGY RANGE
HADRON REACTIONS
MATHEMATICAL MODELS
METALS
MEV RANGE
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEON REACTIONS
SPECTRA
TARGETS
TRANSFER REACTIONS
651720* - Nuclear Properties & Reactions
A=90-149
Experimental