Determinación de las características angulares de los estados base y primer excitado de 17O a energías moderadas (~1.6 mev) en y afuera de una resonancia de 18F

MA. ESTHER O. DE LÓPEZ

Resumen


THE ANGULAR DISTRIBUTION IN THE REACTION 15O (D,P) 17O (I) SHOWS A REMARKABLE INCREASE OF THE CROSS SECTION AT HIGHER ANGLES. TO DETERMINE MORE CAREFULLY THIS INCREASE, STUDIES WERE CARRIED OUT USING A VAN DE GRAFF ACCELERATOR AND BROAD-RANGE MAGNETIC SPECTROGRAPH. THE RESONANCE ENERGY OF THE COMPOUND NUCLEUS 16O+D WAS FIRST ESTABLISHED; ANGULAR DISTRIBUTIONS OF THE 17O GROUND AND FIRST EXCITED LEVELS WERE RUN AT BOMBARDING ENERGIES OF 1.65 AND 1.53 MEV, RESPECTIVELY, IN AND OUT OF THE 18F RESONANCE (EX = 8.99 MEV). THE 13C(0) WAS OBSERVED TOO, WHEN BOMBARDING WITH 1.65 MEV PARTICLES. BY COMPARING THE EXPERIMENTAL CURVES WITH THE THEORETICAL ONES, OBTAINED BY USE OF THE BUTLER THEORY, FOR BOTH INCIDENT DEUTERON ENERGIES, IT IS POSSIBLE TO ASSOCIATE THE NEUTRON CAPTURE MOMENTA I- =2 AND I- = I TO THE (D,P) REACTIONS LEADING TO THE GROUND STATES OF 17O AND 13C, RESPECTIVELY; THE VALUES I- = 0 AND I- = 4 CAN BE FITTED SIMULTANEOUSLY TO THE 17O (I) STATE. ALTHOUGH THE BACKGROUND IS HIGHER IN RESONANCE THAN OUT OF IT, BOTH CASES SHOW A NOTORIOUS INCREASE AROUND 95- (CENTER OF MASS SYSTEM) COMPARABLE WITH MEASURED INTENSITY AT 0-. THE BUTLER THEORY SEEMS NOT TO BE APPLICABLE TO THE OBSERVED SHAPE OF THE 871 KEV LEVEL IN 17O, AS IT WOULD LEAD TO I- =4, WHICH IS NOT A REASONABLE ASSIGNMENT FOR 17O (I).

Texto completo:

pdf