delta. (1236)-isobar degrees of freedom and the strength of spin-isospin resonances
The most interesting feature of the spin-isospin modes excited in charge-exchange reactions is the magnitude of the transition strength. In the case of the Gamow-Teller resonances (GTR) there exists a well established, model-independent sum rule which is simply connected with the number of protons and neutrons: S/sub ..beta../sup -//-S/sub ..beta../sup +// = 3(N-Z), where the 1.h.s. is the difference between the ..beta../sup -/ and ..beta../sup +/ GT-strength. So far only about 60% of this sum rule strength has been detected experimentally. Conventional nuclear structure effects seem to be unable to explain the missing GT-strength. Several years ago already ..delta..-isobar degrees of freedom were suggested to play an important role in the quenching of the axial-vector coupling constant gA/sup 2/. In this contribution the author presents a consistent calculation of different experimental quantities in the /sup 48/Ca-region which are all connected with the spin-isospin part of the particle-hole interaction. This part of the force is of crucial importance in connection with the quenching. 9 references, 4 figures.
- Research Organization:
- Institut fuer Kernphysik, Juelich, West Germany
- OSTI ID:
- 5559710
- Report Number(s):
- CONF-821050-
- Journal Information:
- AIP Conf. Proc.; (United States), Journal Name: AIP Conf. Proc.; (United States) Vol. 57; ISSN APCPC
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
A=39-58
Theoretical-- Energy Levels & Transitions-- (-1987)
651515* -- Nuclear Properties & Reactions
A=39-58
Theoretical-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
BARYON REACTIONS
BARYON RESONANCES
BARYON-BARYON INTERACTIONS
BARYONS
BORN APPROXIMATION
CALCIUM 48 TARGET
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DELTA-1236 RESONANCES
DIFFERENTIAL CROSS SECTIONS
ELECTRONS
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
FERMIONS
FORM FACTORS
GAMOW-TELLER RULES
HADRON REACTIONS
HADRON-HADRON INTERACTIONS
HADRONS
HOLES
INELASTIC SCATTERING
INTERACTIONS
ISOSPIN
LEPTONS
MEV RANGE
MEV RANGE 100-1000
N RESONANCES
NEUTRONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEON-NUCLEON INTERACTIONS
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PROTON REACTIONS
PROTON-NUCLEON INTERACTIONS
PROTONS
RESONANCE PARTICLES
SCATTERING
SPIN
TARGETS