SCATTERING OF ALPHA PARTICLES FROM OXYGEN IN THE BOMBARDING ENERGY RANGE FROM 10 TO 19 Mev

Thesis/Dissertation · Mon Jan 01 04:00:00 EST 1962

OSTI ID:4742527

Mehta, M K

The scattering of alpha particles from O/sup 16/ was studied by observation of the elastically scattered alpha particles and gamma rays from the excitation of the second, third, and fourth excited states of O/sup 16/, following the inelastic events. The bombarding energy ranged from 10 to 19 Mev. Junction counters were used to detect the alpha particles. Excitation curves were measured at eight angles and 38 levels in Ne/sup 20/ were identified. Tentative spin and parity assignments for 17 levels were made from the behavior of the excitation curves at angles corresponding to the zeros of the Legendre Polynomials of first eight orders. Angular distributions of the elastic particles measured at seven energies show an oscillatory pattern. The data were analyzed in terms of the Akniezer-PomeranchukBlair-McIntyre model, and the optical model. Good fits were obtained oniy when specific contributions from the resonances observed in the excitation curves were included in the APBM model. The optical model analysis resulted in good qualitative fits with real potentials of about 150 Mev and surface imaginary potential between 3 and 5 Mev. In general optical model fits were poor compared to the APBM results. Gamma rays were detected by NaI(Tl) crystals. The excitation curves showed considerable structure. Most of the levels observed in the elastic scattering were identified in the gamma ray experiment also. Angular distributions of the 6.14 Mev gamma rays from the deexcitation of the second excited state in O/sup 16/, were analyzed in terms of the compound nuclear states. This resulted in a spin and parity assignment of either 4/sup +/ of 5/sup -/ to the state at 13.042 Mev and a probable assignment of 2/sup +/ to the state at 17.290 Mev. (Dissertation Abstr., 23: No. 5, Nov. 1962)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-17-009624
• OSTI ID: 4742527
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALPHA DETECTION
ALPHA PARTICLES
ANGULAR DISTRIBUTION
CRYSTAL COUNTERS
ENERGY
ENERGY LEVELS
EXCITATION
GAMMA RADIATION
INTERACTIONS
IRRADIATION
LEGENDRE FUNCTIONS
LEGENDRE POLYNOMIALS
LIFETIME
MATHEMATICS
MEASURED VALUES
NEON 20
NUCLEAR MODELS
NUCLEI
OPTICAL MODEL
OSCILLATIONS
OXYGEN 16
PARITY
PHYSICS
RESONANCE
SCATTERING
SODIUM IODIDES
SPIN
THALLIUM