Alpha-particle breakup at incident energies of 20 and 40 MeV/nucleon

Journal Article · Mon Oct 01 04:00:00 EDT 1979 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.20.1284· OSTI ID:5894647

Wu, J R; Chang, C C; Holmgren, H D; Koontz, R W

The breakup of alpha particles at incident energies of 20 and 40 MeV/nucleon on /sup 27/Al, /sup 58/Ni, /sup 90/Zr, and /sup 209/Bi has been studied. It was found that the breakup cross section decreases rapidly with increasing angles and increases with increasing target mass and incident energy. The total breakup yield, summed over all charged fragments, is approx.15--35% of the alpha-particle total reaction cross section, and has an approximate A/sup 1/3/ dependence. The ratios of breakup yields among different fragments are approximately p:d:t:/sup 3/He approx. = 13:3:1:2, and are roughly independent of the incident energy and the target nucleus. These features suggest that the alpha-particle fragmentation is a peripheral process and is dominated by the properties of the incident projectile. A simple plane-wave alpha-particle breakup model gives a rather good description to the experimental data. In addition to the breakup deuteron peak at half of the beam energy, a second peak at quarter of the beam energy (or the same energy as the breakup proton peak) is observed. This peak might be due to a two-step breakup-pickup process.

• Research Organization: Department of Physics and Astronomy, University of Maryland, College Park, Maryland 20742
• OSTI ID: 5894647
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 20:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA REACTIONS
ALUMINIUM 27 TARGET
ANGULAR DISTRIBUTION
BISMUTH 209 TARGET
BREAKUP REACTIONS
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DEUTERON SPECTRA
DISTRIBUTION
ENERGY RANGE
EVEN-ODD NUCLEI
FRAGMENTATION
HELIUM 3
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
NICKEL 58 TARGET
NUCLEAR REACTIONS
NUCLEI
PROTON SPECTRA
SPECTRA
STABLE ISOTOPES
TARGETS
TOTAL CROSS SECTIONS
TRITONS
ZIRCONIUM 90 TARGET