REACTION MECHANISM STUDIES ON Si$sup 28$(d,p). II. INTERFERENCE EFFECTS

Journal Article · Thu Dec 01 04:00:00 EST 1960 · Nuclear Phys.

DOI:https://doi.org/10.1016/0029-5582(60)90078-X· OSTI ID:4087078

Kuehner, J A; Almqvist, E; Bromley, D A

Measurements bearing upon the mechanism for the Si/sup 28/(d,p)Si/sup 29/ reaction, including measurements of different ial and total excitation functions and of angular distributions for the proton groups leading to the lowest three states of Si/sup 29/, were made for incident deuterons of energy 8 to 10.7 Mev and for proton detector angles 0 to 155 deg . These measurements demonstrated a dominant direct interaction amplitude, with, however, a small residual compound system amplitude reflected in interference terms in the cross section. The effects of this interference were displayed by prominent resonance structure in the excitation curves, particularly for proton angles off the forward stripping peak. Upper limits of < 15 and < 30% were established for the intensity of the compound system contributions to the reaction cross sections to the ground state and first two excited states of Si/sup 29/ respectively. Angular distributions were found to have similar features over the energy range studied and to display diffraction structure which persisted even at large angles. The angular positions of the structural features were well fitted by Butler theory but wita the observed envelope decreasing much less rapidly with angle than does the prediction. Empirically it was demonstrated that adequate fits are obtained by removing the angle dependence contained in the deuteron factor that appears in the Butler expression for the angular distribution. Reduced widths were obtained using the methods of Amado and of Bowcock. A comparison of these reduced widths with values obtained by the usual peak- fitting technique demonstrated that the same relative reduced widths are given by the three methods but that the absolute value obtained using the Amado extrapolation is approximately a factor of two less than that obtained with the other two techniques. (auth)

• Research Organization: Atomic Energy of Canada Ltd., Chalk River, Ont.
• NSA Number: NSA-15-010034
• OSTI ID: 4087078
• Journal Information: Nuclear Phys., Journal Name: Nuclear Phys. Vol. Vol: 21
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANGULAR DISTRIBUTION
BUTLER THEORY
COMPOUND NUCLEI
CROSS SECTIONS
DETECTION
DEUTERON BEAMS
ENERGY
ENERGY LEVELS
ENERGY RANGE
EXCITATION
EXCITATION FUNCTION
INTERACTIONS
MEASURED VALUES
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEAR THEORY
NUCLEI
PHYSICS
PROTONS
RESONANCE
SILICON 28
SILICON 29
SPECTRA
STRIPPING
TARGETS