A = 4 0/sup +/ - 1/sup +/ binding-energy difference

Conference · Fri Jan 01 00:00:00 EST 1982

OSTI ID:5195127

Gibson, B F; Lehman, D R

The A = 4 ..lambda..-hypernuclei provide a rich source of information about the s-wave properties of the fundamental hyperon-nucleon (YN) force as well as offer a unique opportunity to investigate the complications that arise in calculations of the properties of bound systems in which one baryon (here the ..lambda..) with a given isospin couples strongly to another (the ..sigma..) with a different isospin. The ..lambda../sup 4/H - ..lambda../sup 4/He isodoublet ground-state energies are not consistent with a charge symmetry hypothesis for the YN interaction. The (spin-flip) excitation energies are quite sensitive to the ..lambda..N - ..sigma..N coupling of the YN interaction. In particular, when one represents the free YN interaction in terms of one-channel effective ..lambda..N potentials, the resulting 0/sup +/ (ground) state and 1/sup +/ (excited) spin-flip state are inversely ordered in terms of binding energies, the 1/sup +/ state being more bound. It is the ..sigma.. suppression that results from the reduced strength of the ..lambda..N - ..sigma..N off-diagonal coupling potential when the trinucleon core is restricted to isospin-1/2 which we study here. We find this spin-isospin suppression of the ..lambda..-..sigma.. conversion, which is due to the composite nature of the nuclear cores of the ..lambda../sup 4/H and ..lambda../sup 4/He hypernuclei, to be a significant factor in understanding the 0/sup +/ - 1 /sup +/ binding energy relationship.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); George Washington Univ., Washington, DC (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5195127
• Report Number(s): LA-UR-82-1744; CONF-820635-4; ON: DE82017589; TRN: 82-016940
• Resource Relation: Conference: International conference on hypernuclear and kaon physics, Heidelberg, F.R. Germany, 20 Jun 1982
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
HYPERNUCLEI
BINDING ENERGY
COUPLING
GROUND STATES
HELIUM
HYDROGEN
ISOSPIN
S WAVES
ELEMENTS
ENERGY
ENERGY LEVELS
FLUIDS
GASES
NONMETALS
NUCLEAR FRAGMENTS
NUCLEI
PARTIAL WAVES
PARTICLE PROPERTIES
RARE GASES
645201* - High Energy Physics- Particle Interactions & Properties-Theoretical- General & Scattering Theory