Isospin mixing in light nuclei

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1982

OSTI ID:6746635

Wilkerson, J F

Isospin mixing in light nuclei has been directly studied through isospin-forbidden resonances corresponding to high-lying T = 3/2 states in A = 4n + 1 T/sub z/ = -1/2 nuclei. High-lying T = 3/2 states in A = 25, 29, 33, and 37, and T/sub z/ = absolute value 1/2 nuclei were identified by the isospin-allowed (p,t) and (p,/sup 3/He) reactions at a single angle with an incident proton energy of 42.4 MeV. Comparisons of angular distributions measured at 60 MeV for /sup 27/Al(p,t)/sup 25/Al, /sup 27/Al(p,/sup 3/He)/sup 25/Mg, /sup 31/P(p vector,t)/sup 29/P, and /sup 31/P(p vector,/sup 3/He)/sup 29/Si were used to assign T = 3/2 levels in the A = 25 and A = 29, T/sub z/ = absolute value 1/2 nuclei. A measurement system utilizing a high-resolution polarized proton beam was developed at Triangle Universities Nuclear Laboratory to measure (p vector,p) scattering over isospin-forbidden resonances. The polarized-beam energy excitation functions were analyzed to extract all resonance parameters from the results of a single experiment. A system was developed to measure directly the beam energy spread. Parameters for several previously studied first T = 3/2 resonances in the A = 4n + 1, T/sub z/ = -1/2 nuclei were remeasured to confirm the validity of our new measurement and analysis techniques. High-lying T = 3/2 isospin-forbidden resonances in /sup 17/F, /sup 25/Al, /sup 29/P, /sup 33/Cl, and /sup 37/K were studied and proton elastic-scattering reduced widths were extracted by a model-independent helicity amplitude analysis. The results of the present study indicate that the isospin mixing in a given nucleus does not increase monotonically with increasing excitation energy. The present study, in conjunction with previous work, indicates that the isospin mixing exhibits a smooth dependence with mass number A and is largely independent of nuclear structure.

• Research Organization: North Carolina Univ., Chapel Hill (USA)
• OSTI ID: 6746635
• Country of Publication: United States
• Language: English

Related Subjects

651423* -- Nuclear Properties & Reactions
A=20-38
Experimental-- Energy Levels & Transitions-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METAL ISOTOPES
ALKALINE EARTH ISOTOPES
ALUMINIUM 25
ALUMINIUM 27
ALUMINIUM ISOTOPES
BARYON REACTIONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
CHLORINE 33
CHLORINE ISOTOPES
CONFIGURATION MIXING
DATA
DIRECT REACTIONS
ELASTIC SCATTERING
ENERGY DEPENDENCE
ENERGY LEVELS
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FLUORINE 17
FLUORINE ISOTOPES
HADRON REACTIONS
HELIUM 3
HELIUM ISOTOPES
INFORMATION
INTERACTIONS
ISOSPIN
ISOTOPES
LIGHT NUCLEI
MAGNESIUM 25
MAGNESIUM ISOTOPES
MINUTES LIVING RADIOISOTOPES
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUMERICAL DATA
ODD-EVEN NUCLEI
PARTICLE PROPERTIES
PHOSPHORUS 29
PHOSPHORUS 31
PHOSPHORUS ISOTOPES
PICKUP REACTIONS
POTASSIUM 37
POTASSIUM ISOTOPES
PROTON REACTIONS
RADIOISOTOPES
SCATTERING
SECONDS LIVING RADIOISOTOPES
SILICON 29
SILICON ISOTOPES
STABLE ISOTOPES
TRANSFER REACTIONS
TRITONS