Spin alignment and resonance behavior in the sup 24 Mg + sup 24 Mg system

Thesis/Dissertation · Fri Jan 01 00:00:00 EST 1988

OSTI ID:5016997

Wuosmaa, A H

The author has studied heavy-ion resonance behavior in the {sup 24}Mg + {sup 24}Mg system using particle-{gamma} and particle-{gamma}-{gamma} angular correlation techniques. These methods have allowed us to determine the single and correlated magnetic-substate populations for single and mutual inelastic scattering to the 2{sup +}(1.37 MeV) state in {sup 24}Mg in the region of two strong resonances seen at E{sub c.m.} = 45.70 and 46.65 MeV. The measurements were performed using the Holifield Heavy Ion Research Facility Spin spectrometer, a 4{pi} {gamma}-detector array. The magnetic-substate population and angular-distribution data for single and mutual inelastic scattering suggest a spin assignment of J{sup {pi}} = 36{sup +} for the resonance seen at E{sub c.m.} = 45.70 MeV. Also, these data suggest a dominant decay l value of l = 34h for this resonance in both single and mutual inelastic scattering. The resonance spin and decay l values are 2 to 4 units above the grazing angular moment generated by optical model calculations. The author used similar techniques to study the one and two {alpha}-transfer reactions {sup 24}Mg({sup 24}Mg,{sup 20}Ne){sup 28}Si and {sup 24}Mg({sup 24}Mg,{sup 16}O){sup 32}S. These data show that the details of these heavy-ion reactions depend critically upon the angular momentum matching properties of these different heavy-ion systems. The results also suggest weak decay branches for these resonances to the mass-asymmetric {sup 16}O + {sup 32}S system. He used the Rotating Liquid Drop Model to examine the structure of the composite nucleus {sup 48}Cr at high spin and excitation energy. The equilibrium shapes, energy levels and fission barriers obtained from these calculations suggest that the observed resonances correspond to the population of highly deformed, high spin states in the composite nucleus {sup 48}Cr.

• Research Organization: Pennsylvania Univ., Philadelphia, PA (USA)
• OSTI ID: 5016997
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
MAGNESIUM 24 REACTIONS
ALPHA-TRANSFER REACTIONS
INELASTIC SCATTERING
MAGNESIUM 24 TARGET
ANGULAR CORRELATION
ANGULAR MOMENTUM
CHROMIUM 48
DECAY
LIQUID DROP MODEL
NUCLEAR STRUCTURE
RESONANCE
SILICON 28
SPECTROMETERS
SPIN
SULFUR 32
BETA DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
CHROMIUM ISOTOPES
CORRELATIONS
DIRECT REACTIONS
ELECTRON CAPTURE RADIOISOTOPES
EVEN-EVEN NUCLEI
FOUR-NUCLEON TRANSFER REACTIONS
HEAVY ION REACTIONS
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MULTI-NUCLEON TRANSFER REACTIONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
PARTICLE PROPERTIES
RADIOISOTOPES
SCATTERING
SILICON ISOTOPES
STABLE ISOTOPES
SULFUR ISOTOPES
TARGETS
TRANSFER REACTIONS
651420* - Nuclear Properties & Reactions
A=20-38
Experimental