Study of complete fusion for several mass 40, 42 systems

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1982

OSTI ID:7185236

Racca, R A

Total fusion cross-sections have been measured for the /sup 15/N + /sup 27/Al system over the energy range 27 MeV less than or equal to E/sub lab/ less than or equal to 70 MeV by detection of the fusion-evaporation residues. The results were compared with those previously obtained for the alternate entrace channels, /sup 16/O + /sup 26/Mg and /sup 18/O + /sup 24/Mg. The comparison clearly shows that the system involving /sup 16/O as a projectile is distinctly different from the other two systems. In order to understand how this difference is reflected in the behavior of the individual fusion residues, ..gamma..-ray yields from each residue have been measured over the energy range 25 MeV E/sub lab/ 70 MeV for /sup 16/O + /sup 26/Mg and 27 MeV less than or equal to E/sub lab/ less than or equal to 65 MeV for /sup 18/O + /sup 24/Mg. A comparison of the specific residue strengths for each system indicates that the low energy fusion yield for the /sup 16/O + /sup 26/Mg system is dominated by those residues with mass numbers 40 and 37 while no such dominance was evident for /sup 18/O + /sup 24/Mg. Furthermore, and unexpectedly large /sup 40/K yield was seen for the former system. Experimental fusion yields from each system were compared with the predictions of a statistical evaporation model. ..gamma..-ray measurements have also been performed for the /sup 16/O + /sup 24/Mg system over the energy range 40 MeV E/sub lab/ less than or equal to 51 MeV in 350 keV intervals. A standard correlation analysis was used to test for the existence of correlated structure in the evaporation yields. The results indicate that the structures which exist for the various fusion residues are very weak and uncorrelated at the statistical limits of the data.

• Research Organization: Kansas Univ., Lawrence (USA)
• OSTI ID: 7185236
• Country of Publication: United States
• Language: English

Related Subjects

651425* -- Nuclear Properties & Reactions
A=20-38
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METAL ISOTOPES
ALUMINIUM 27 TARGET
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DATA
ELECTRON CAPTURE RADIOISOTOPES
ENERGY RANGE
EXPERIMENTAL DATA
FUSION REACTIONS
FUSION YIELD
GAMMA SPECTRA
HEAVY ION REACTIONS
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPES
LIGHT NUCLEI
MAGNESIUM 24 TARGET
MAGNESIUM 26 TARGET
MEV RANGE
MEV RANGE 10-100
NITROGEN 15 REACTIONS
NUCLEAR REACTION YIELD
NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
OXYGEN 16 REACTIONS
OXYGEN 18 REACTIONS
POTASSIUM 40
POTASSIUM ISOTOPES
RADIOISOTOPES
SPECTRA
TARGETS
YEARS LIVING RADIOISOTOPES
YIELDS