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Nuclear resonance fluorescence studies of sodium, aluminum, and phosphorous

Thesis/Dissertation ·
OSTI ID:6081645
The nuclear resonant scattering of photons by /sup 23/Na, /sup 27/Al, and /sup 31/P was measured for excitation energies between 4 and 10 MeV, using bremsstrahlung beams with endpoint energies of 7.6 and 10.3 MeV. The energies and intensities of the scattered radiation were measured with a Ge(Li) detector. Elastic scattering and self-absorption measurements determined values of g/sub 0//sup 2/ and g/sub 0/, respectively, for many levels in each of these nuclei. Values of excitation energies were also obtained from these measurements. For several levels, the inelastic scattering of photons was measured to determine branching ratios. The results are compared with earlier spectroscopic studies. For several levels in each nucleus, the measured electromagnetic decay properties are discussed in terms of the particle-rotor model of collective nuclear excitations. The measured properties of two T = 3/2 levels in /sup 23/Na and /sup 31/P are also discussed. In addition, some of the self-absorption results are shown to be useful for the purposes of photon flux calibration. Additional photon scattering measurements were carried out for /sup 11/B, /sup 88/Sr, /sup 90/Zr and /sup 92/Mo. Self-absorption measurements were carried out for /sup 11/B and /sup 24/Mg. The results of these measurements are presented. The /sup 11/B and /sup 24/Mg self-absorption results were used for photon flux calibration measurements.
Research Organization:
Illinois Univ., Urbana (USA)
OSTI ID:
6081645
Country of Publication:
United States
Language:
English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ABSORPTION
ALUMINIUM 27 TARGET
ATOM COLLISIONS
BORON 11 TARGET
BRANCHING RATIO
COLLISIONS
ELASTIC SCATTERING
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXCITATION
INELASTIC SCATTERING
MAGNESIUM 24 TARGET
MEV RANGE
MEV RANGE 01-10
MOLYBDENUM 92 TARGET
PHOSPHORUS 31 TARGET
PHOTON COLLISIONS
PHOTON-ATOM COLLISIONS
SCATTERING
SELF-ABSORPTION
SODIUM 23 TARGET
STRONTIUM 88 TARGET
TARGETS
ZIRCONIUM 90 TARGET