Longitudinal and transverse spin response of [sup 12]C in the [Delta] resonance region

Journal Article · Thu Sep 01 04:00:00 EDT 1994 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.50.1637· OSTI ID:6953383

Koerfgen, B; Osterfeld, F ^[1]; Udagawa, T ^[2]

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1. Institut fuer Kernphysik, Forschungszentrum Juelich GmbH, 52425 Juelich (Germany)
2. Department of Physics, University of Texas, Austin, Texas 78712 (United States)

The [Delta] excitations in nuclei induced by pion and photon scattering are analyzed within the isobar-hole model. The results are compared to those of intermediate energy charge exchange reactions. The similarities and differences between the various probes due to their kinematics and spin-structure are discussed. It is shown that the experimental cross sections for pion and photon induced reactions as well as for the inclusive charge exchange reactions can be consistently described within the isobar-hole model. Of special interest is the coherent pion decay of the [Delta] resonance which is studied by means of the exclusive reaction [sup 12]C([sup 3]He,[ital t][pi][sup +])[sup 12]C(g.s.), by elastic pion scattering, and by pion photoproduction. It turns out that the coherent pion decay of the [sup 12]C([sup 3]He,[ital t][pi][sup +])[sup 12]C(g.s.) reaction is intimately related to elastic pion scattering. Most interestingly, both the peak energy and the magnitude of the coherent pion production cross section depend very sensitively on the strength of the [Delta]-hole residual interaction. The observed energy shift is directly proportional to the nuclear density [rho]. This shows that the coherent pions propagate through the nuclear interior. The coherent pion cross section can be used to determine the Landau-Migdal parameter [ital g][sub [Delta][Delta]][sup [prime]].

• DOE Contract Number: FG02-90ER40566
• OSTI ID: 6953383
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 50:3; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
BARYONS
BOSONS
CARBON 13 TARGET
CHARGE-EXCHANGE REACTIONS
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DELTA BARYONS
DIFFERENTIAL CROSS SECTIONS
ELASTIC SCATTERING
ELEMENTARY PARTICLES
FERMIONS
FUNCTIONS
HADRON REACTIONS
HADRONS
HELIUM 3 REACTIONS
ISOBAR MODEL
MATHEMATICAL MODELS
MESON REACTIONS
MESONS
N BARYONS
NUCLEAR REACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PHOTONUCLEAR REACTIONS
PION REACTIONS
PIONS
PIONS PLUS
PSEUDOSCALAR MESONS
RESPONSE FUNCTIONS
SCATTERING
SPIN
TARGETS
TRITONS