T sub 20 problem and spin observables in pion-deuteron scattering

Journal Article · Fri Dec 01 00:00:00 EST 1989 · Physical Review (Section) C: Nuclear Physics; (USA)

DOI:https://doi.org/10.1103/PhysRevC.40.2763· OSTI ID:7273114

Mizutani, T ^[1]; Fayard, C; Lamot, G H ^[2]; Saghai, B ^[3]

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1. Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 (USA)
2. Institut de Physique Nucleaire and Institut National de Physique Nucleaire et de Physique des Particules Universite Claude Bernard, Lyon-1, F-69622 Villeurbanne CEDEX, (France)
3. Service de Physique Nucleaire-Haute Energie, Centre d'Etudes Nucleaires de Saclay, F-91191 Gif-sur-Yvette CEDEX, (France)

There has been a long-standing problem in the coupled {pi}{ital NN}-{ital NN} theory concerning its apparent failure in reproducing the tensor polarization {ital T}{sub 20} in the elastic {pi}{ital d} scattering at medium energies. A mechanism recently proposed by Jennings to solve this problem is examined. It is then found that it comes from the positive-energy pole in one of the nucleon propagators in the exchange impulse diagram within the covariant picture which is usually overlooked when devising the spectator on-mass-shell approximation, and that it does not lead to the claimed near cancellation of the Pauli exchange contribution, but is important to be included. The inclusion of this contribution is shown to considerably improve in reproducing the pion-deuteron spin observables including {ital T}{sub 20}, particularly above the delta resonance energy.

• OSTI ID: 7273114
• Journal Information: Physical Review (Section) C: Nuclear Physics; (USA), Vol. 40:6; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
DEUTERIUM TARGET
PION REACTIONS
ELASTIC SCATTERING
ANALYZING POWER
DIFFERENTIAL CROSS SECTIONS
HELICITY
IMPULSE APPROXIMATION
MEV RANGE 100-1000
PAULI PRINCIPLE
POLARIZATION
PROPAGATOR
SHELL MODELS
SPIN
THREE-BODY PROBLEM
ANGULAR MOMENTUM
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
ENERGY RANGE
HADRON REACTIONS
MANY-BODY PROBLEM
MATHEMATICAL MODELS
MESON REACTIONS
MEV RANGE
NUCLEAR MODELS
NUCLEAR REACTIONS
PARTICLE PROPERTIES
SCATTERING
TARGETS
653003* - Nuclear Theory- Nuclear Reactions & Scattering