Dibaryon Model for Nuclear Force and the Properties of the 3N System

Journal Article · Thu Sep 01 04:00:00 EDT 2005 · Physics of Atomic Nuclei

DOI:https://doi.org/10.1134/1.2053331· OSTI ID:20692864

Pomerantsev, V N; Kukulin, V I; Voronchev, V T ^[1]; Faessler, A ^[2]

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1. Institute of Nuclear Physics, Moscow State University, Moscow (Russian Federation)
2. Institute for Theoretical Physics, University of Tuebingen (Germany)

The dibaryon model for NN interaction, which implies the formation of an intermediate six-quark bag dressed by a {sigma} field, is applied to the 3N system, where it results in a new three-body force of scalar nature between the six-quark bag and a third nucleon. A new multicomponent formalism is developed to describe three-body systems with nonstatic pairwise interactions and nonnucleonic degrees of freedom. Precise variational calculations of 3N bound states are carried out in the dressed-bag model including the new scalar three-body force. The unified coupling constants and form factors for 2N- and 3N-force operators are used in the present approach, in sharp contrast to conventional meson-exchange models. It is shown that this three-body force gives at least half the 3N total binding energy, while the weight of nonnucleonic components in the {sup 3}H and {sup 3}He wave functions can exceed 10%. The new force model provides a very good description of 3N bound states with a reasonable magnitude of the {sigma} N N coupling constant. A new Coulomb 3N force between the third nucleon and dibaryon is found to be very important for a correct description of the Coulomb energy and rms charge radius in {sup 3}He. In view of the new results for Coulomb displacement energy obtained here for A=3 nuclei, an explanation for the long-term Nolen-Schiffer paradox in nuclear physics is suggested. The role of the charge-symmetry-breaking effects in the nuclear force is discussed.

• OSTI ID: 20692864
• Journal Information: Physics of Atomic Nuclei, Journal Name: Physics of Atomic Nuclei Journal Issue: 9 Vol. 68; ISSN 1063-7788; ISSN PANUEO
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BAG MODEL
BINDING ENERGY
BOSON-EXCHANGE MODELS
BOUND STATE
COULOMB ENERGY
COUPLING CONSTANTS
DEGREES OF FREEDOM
DIBARYONS
FORM FACTORS
HELIUM 3
NUCLEAR FORCES
NUCLEON-NUCLEON INTERACTIONS
NUCLEONS
QUARKS
SYMMETRY BREAKING
THREE-BODY PROBLEM
TRITIUM
VARIATIONAL METHODS
WAVE FUNCTIONS