PROTON TRANSFER TO SPECIFIC FINAL STATES IN THE REACTION Al$sup 27$(O$sup 16$,N$sup 15$)Si$sup 28$ NEAR THE COULOMB BARRIER

Journal Article · Thu Nov 14 23:00:00 EST 1963 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.132.1720· OSTI ID:4153136

Newman, E; Toth, K S; Zucker, A

The angular distribution of N/sup 15/ particles, resulting from the transfer reaction Al/sup 27/ (O/sup 16/,N/sup 15/)Si/sup 28/, was determined at three incident energies: 28.5, 30.0 and 36.0 Mev The O/sup 16/ ions were accelerated in the Oak Ridge Tandem Van de Graaff. Two silicon-surface barrier counters were placed at the proper angles to detect the N/sup 15/ and Si/sup 28/ particles in coincidence. A proportional counter imposed the further restriction that particles observed in the defining counter be nitrogen nuclei. Angular distributions were determined for two particular final-state transfers: (1) leaving both residual nuclei in their ground states, and (2) leaving the Si/sup 28/ in its first excited state. Within experimental error the two distributions for a given bombarding energy were found to peak at approximately the same center- of-mass angle. By integrating the differential cross sections, the total reaction cross sections, in order of increasing energy, were determined to be: (1) 0.88, 1.3 plus or minus , and 1.37 mb for the ground-state transfers, and (21 0.96, 1.72, and 2.72 mb for the excited-state transfers. The angular distributions were compared with the predictions of the tunneling theory of Breit bearing in mind that the theory, as formulated, is applicable only to the transfer of neutrons, not protons, and only at incident energies below the Coulomb barrier. As expected, the agreement was found to be better at 28. plus or minus and 30.0 Mev than at 36.0 Mev. (auth)

• Research Organization: Oak Ridge National Lab., Tenn.
• NSA Number: NSA-18-001062
• OSTI ID: 4153136
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 132; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALUMINUM 27
ANGULAR DISTRIBUTION
BREIT THEORY
COINCIDENCE METHODS
CROSS SECTIONS
CRYSTAL COUNTERS
DISPERSION RELATIONS
ELECTRIC FIELDS
ENERGY LEVELS
ENERGY RANGE
ERRORS
ION BEAMS
MEV RANGE
NEUTRONS
NITROGEN 15
NUCLEAR REACTIONS
OPE MODEL
OXYGEN 16
PHYSICS
PROPORTIONAL COUNTERS
PROTONS
SCATTERING
SEMICONDUCTORS
SILICON 28
VAN DE GRAAFF ACCELERATORS