ELASTIC SCATTERING OF ALPHA PARTICLES BY O$sup 1$$sup 6$

Technical Report · Wed Apr 01 04:00:00 EST 1959

OSTI ID:4257147

McDermott, L C

Absolute cross sections for the elastic scattering by O/sup 16/ of alpha particles from a Van de Graaff generator have been measured in a differentially pumped gas scattering chamber. The bombarding energy was varied continuously from 3.7 to 6.5 Mev. The corresponding region of excitation in Ne/sup 20/ is between 7.7 and 9.9 Mev. The measurements were made at center of mass angles of 168.9 , 149.4 , 140.8 , 125.3 , and 90.0 . The reaction theory of Wigner and Eisenbud, for the case of elastic scattering of spin 0 by spin 0 particles, is applied in the analysis of the observed resonances above 7.9 Mev to find their spins, parities, resonant energies and widths. The characteristic energies and reduced alpha particle widths are also assigned. Six previously unobserved resonances have been found in this region. Five of these levels at 8.748, 8.898, 9.092, 9.172, and 9.570 Mev are sufficiently well resolved for positive identification and assignment of parameters. A probable identification is made in the case of the one unresolved resonance at 8.83 Mev. In addition to these relatively sharp resonances, two very broad overlapping resonances must be postulated in the energy range studied if the data are to be fit by resonance theory. The presence of a third broad resonance seems to be indicated above the energy range included in the data. Approximate values of the parameters of the broad resonances are given. (auth)

• Research Organization: Columbia Univ., New York. Pupin Cyclotron Lab.; Columbia Univ., New York. George B. Pegram Lab.
• NSA Number: NSA-13-014597
• OSTI ID: 4257147
• Report Number(s): CU-187
• Country of Publication: United States
• Language: English

Related Subjects

ALPHA BEAMS
ALPHA PARTICLES
ANGULAR DISTRIBUTION
CROSS SECTIONS
DISPERSION THEORY
ELEMENTARY PARTICLES
ENERGY
ENERGY LEVELS
EXCITATION
MEASURED VALUES
MEV RANGE
NEON 20
OXYGEN 16
PARITY
PHYSICS AND MATHEMATICS
RADIATION DETECTORS
RESOLUTION
RESONANCE
SCATTERING
SPIN
VAN DE GRAAFF ACCELERATORS
VARIATIONS
WIGNER-EISENBUD THEORY