Coherent contributions of charge-dependent forces to the spreading width of the analog of /sup 49/Ca

Journal Article · Tue Oct 01 04:00:00 EDT 1985 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.32.1196· OSTI ID:5254544

Kim, G K; MacDonald, W M

We report on a microscopic calculation of the spreading width GAMMA/sub A//sup arrow-down/ of the isobaric analog state in /sup 49/Sc of the ground state of /sup 49/Ca. In calculating the coupling of the isobaric analog state to hallway states we included (1) first and second order Coulomb coupling, (2) a charge-dependent but charge-symmetric interaction from the mass difference between charged and neutral pions, and (3) a charge-asymmetric interaction fitted to the Coulomb displacement anomaly in /sup 41/Sc-/sup 41/Ca. The second order Coulomb terms arise from mixing with the T = (7/2) component of a giant isovector monopole. The different sets of matrix elements are found to add coherently to give GAMMA/sub A//sup arrow-down/ = 5--7 keV, in excellent agreement with the value of GAMMA/sub A//sup arrow-down/ = 5.3 keV which we obtain from a strength function analysis of the high resolution data on /sup 48/Ca(p,p). The coherent charge-symmetric--charge-dependent contribution gives approximately one-half of GAMMA/sub A//sup arrow-down/. The result for GAMMA/sub A//sup arrow-down/ also includes a charge-asymmetric reduction of about 1 keV, but this is too small to confirm its presence in view of the uncertainty in the value of GAMMA/sub A//sup arrow-down/. .AE

• Research Organization: Department of Physics and Astronomy, University of Maryland, College Park, Maryland 20742
• OSTI ID: 5254544
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 32:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

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651513* -- Nuclear Properties & Reactions
A=39-58
Theoretical-- Energy Levels & Transitions-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH ISOTOPES
ASYMMETRY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BOSONS
CALCIUM 49
CALCIUM ISOTOPES
CHARGE DISTRIBUTION
COHERENT SCATTERING
COULOMB FIELD
ELECTRIC FIELDS
ELEMENTARY PARTICLES
ENERGY LEVELS
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HADRONS
INTERMEDIATE MASS NUCLEI
ISOBARIC ANALOGS
ISOSPIN
ISOTOPES
ISOVECTORS
MATRIX ELEMENTS
MESONS
MINUTES LIVING RADIOISOTOPES
MONOPOLES
NUCLEI
PARTICLE PROPERTIES
PERTURBATION THEORY
PIONS
PIONS NEUTRAL
PSEUDOSCALAR MESONS
RADIOISOTOPES
SCATTERING
STRENGTH FUNCTIONS
TENSORS
VECTORS