Nucleon-nucleon scattering in the 0--6 GeV range and the relativistic optical model based on deep attractive forbidden state potentials

Journal Article · Sat Jun 01 00:00:00 EDT 1991 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.43.2499· OSTI ID:5462694

Neudatchin, V G; Yudin, N P ^[1]; Dorodnykh, Y L ^[2]; Obukhovsky, I T ^[3]

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1. Institute of Nuclear Physics, Moscow State University, Moscow (U.S.S.R.)
2. Institute for Nuclear Research, U.S.S.R. Academy of Sciences, Moscow (U.S.S.R.)
3. Institute for Nuclear Physics, Moscow State University, Moscow (U.S.S.R.)

The optical relativistic model based on deep attractive forbidden state quasipotentials describes well the angular and energy dependence of differential {ital np}- and {ital pp}-scattering cross sections and polarizations, including the transition from the {ital U}-shaped form of the angular distributions of {ital np} scattering to forward scattering at the energy {ital E}{sub lab}{ge}1 GeV, when the scattering {ital P}-phase shifts, equal to {pi} at low energies, pass through {pi}/2 (the triplet and singlet {ital S}-phase shifts start from the values 2{pi} and {pi}, respectively). The higher scattering phase shifts ({ital L}{ge}2) are small everywhere. The potentials are determined from the scattering phase shifts in the low-energy region {ital E}{sub lab}{lt}1 GeV. They have been chosen in the simple Gaussian form and for different partial waves they differ in depth and width (from {ital V}{sub 0}=0.73 GeV, {ital a}=0.85 fm to {ital V}{sub 0}=2.40 GeV, {ital a}=0.45 fm). A few negative phase shifts {sup 3}{ital D}{sub 1}, {sup 3}{ital F}{sub 3}, {sup 3}{ital G}{sub 3}, which reflect the peripheral repulsion due to the spin-orbital and tensor interactions, are calculated by means of the one-boson-exchange potential periphery matched to the central attraction. The imaginary part {ital W} of the optical potential {ital V}+{ital iW} is determined by the value {sigma}{sub tot}/{sigma}{sub el} and grows rapidly with increase in the energy {ital E}{sub lab}, so that the phase-shift values lose sensitivity to the real part {ital V} of optical potential if {ital E}{sub lab} exceeds 5 GeV. Finally, the quantum chromodynamics (QCD) effects are discussed which may underlie the potentials considered.

• OSTI ID: 5462694
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Vol. 43:6; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
NUCLEON-NUCLEON INTERACTIONS
OPTICAL MODELS
DIFFERENTIAL CROSS SECTIONS
GEV RANGE 01-10
OPE MODEL
PARAMETRIC ANALYSIS
PARTIAL WAVES
PHASE SHIFT
POLARIZATION
QUANTUM CHROMODYNAMICS
QUARK MODEL
BARYON-BARYON INTERACTIONS
BOSON-EXCHANGE MODELS
COMPOSITE MODELS
CROSS SECTIONS
ENERGY RANGE
FIELD THEORIES
GEV RANGE
HADRON-HADRON INTERACTIONS
INTERACTIONS
MATHEMATICAL MODELS
OBE MODEL
PARTICLE INTERACTIONS
PARTICLE MODELS
PERIPHERAL MODELS
QUANTUM FIELD THEORY
653003* - Nuclear Theory- Nuclear Reactions & Scattering