A study of Gamow-Teller mixing: Coupling to delta (1232) and isobaric analogue resonances
The problem of missing Gamow-Teller strength is examined in two calculations. The mixing between nucleonic Gamow-Teller states and those containing a delta(1232) resonance in calcium-48, zirconium-90 and tin-132 is studied as a function of the excitation energy of a delta in the nucleus in a shell-model calculation. It is found that mixing is large enough at the experimentally observed nucleon-delta separation to warrant treating the nucleon and the delta resonance on similar footing in intermediate energy nuclear physics. In a second calculation, the coupled channels impulse approximation is used to examine the effect on the Gamow-Teller cross section of coupling to the isobaric analogue state. This is done for incident proton energies of 140 and 175 MeV on a calcium-48 target. Effects on the cross-section of the separation between the isobaric analogue and Gamow-Teller states are also studied. It is found that coupling to the isobaric analogue state has little effect on either the Gamow-Teller or the isobaric analogue cross section.
- Research Organization:
- Indiana Univ., Bloomington, IN (USA)
- OSTI ID:
- 5115336
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
GAMOW-TELLER RULES
CALCULATION METHODS
CALCIUM 48
CROSS SECTIONS
EXCITATION SYSTEMS
MATHEMATICAL MODELS
TIN 132
ZIRCONIUM 90
ALKALINE EARTH ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CALCIUM ISOTOPES
EVEN-EVEN NUCLEI
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MINUTES LIVING RADIOISOTOPES
NUCLEI
RADIOISOTOPES
STABLE ISOTOPES
TIN ISOTOPES
ZIRCONIUM ISOTOPES
400101* - Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
645100 - High Energy Physics- Particle Interactions & Properties-Experimental
651100 - Nuclear Physics- Experimental Techniques- (1980-)