Physical basis for large forward cross sections in /sup 60/Ni(/sup 18/O,/sup 16/O) reaction

Conference · Mon Mar 01 04:00:00 EST 1976

OSTI ID:7361277

Glendenning, N K; Wolschin, G

Experiments on the reaction /sup 60/Ni(/sup 18/O,/sup 16/O)/sup 62/Ni revealed an unexpectedly large forward cross section for production of the ground state, in contrast with an expected grazing peaked distribution. This has most recently been interpreted in terms of a surface transparent optical potential. In the inverse experiment, it is known that /sup 18/O is produced in its 2/sup +/ state with larger cross section than the ground state. This suggests that the above ground state reaction can also be produced with appreciable probability through the excitation of /sup 18/O in the incident channel, with a subsequent transfer of two neutrons to form the ground state of /sup 62/Ni. It is found that by including this process together with the direct transfer, the experimental data can be accounted for. The parameters of the optical potential employed are chosen so as to reproduce both the elastic and inelastic cross sections, and are of the normal strong absorbing type with no surface transparency. It is concluded that the projectile excitation is the physical process involved in the large forward cross section. In addition the interference of the direct and indirect processes can give rise to a minimum beyond the grazing peak followed by a secondary maximum, some indication of which can be found in the experiments on neighboring nuclei. The quantal deflection function is employed in a discussion of the S matrix and angular distribution emerging from this calculation and of the surface transparent potential parametrization of the effect. 5 figures, 1 table.

• Research Organization: California Univ., Berkeley (USA). Lawrence Berkeley Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 7361277
• Report Number(s): LBL-5007; CONF-760424-9
• Country of Publication: United States
• Language: English

Related Subjects

651625* -- Nuclear Properties & Reactions
A=59-89
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DIRECT REACTIONS
DISTRIBUTION
ENERGY LEVELS
EVEN-EVEN NUCLEI
GROUND STATES
HEAVY ION REACTIONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
LIGHT NUCLEI
MATRICES
MULTI-NUCLEON TRANSFER REACTIONS
NICKEL 60 TARGET
NICKEL 62
NICKEL ISOTOPES
NUCLEAR POTENTIAL
NUCLEAR REACTIONS
NUCLEI
OPTICAL MODELS
OXYGEN 16
OXYGEN 18 REACTIONS
OXYGEN ISOTOPES
S MATRIX
STABLE ISOTOPES
STRIPPING
TARGETS
TRANSFER REACTIONS
TWO-NUCLEON TRANSFER REACTIONS