Low-energy differential cross sections of pion-proton ([pi][sup [plus minus]][ital p]) scattering. II. Phase shifts at [ital T][sub [pi]]=32. 7, 45. 1, and 68. 6 MeV

Journal Article · Sat Apr 01 00:00:00 EST 1995 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.51.2159· OSTI ID:6404033

Joram, C; Metzler, M; Jaki, J; Kluge, W; Matthaey, H; Wieser, R ^[1]; Barnett, B M; Bilger, R; Clement, H; Foehl, K; Heitlinger, K; Krell, S; Wagner, G J ^[2]

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1. Institut fuer Experimentelle Kernphysik, Universitaet Karlsruhe, Postfach 3640, D-76021 Karlsruhe (Germany)
2. Physikalisches Institut, Universitaet Tuebingen, Auf der Morgenstelle 12, D-72076 Tuebingen (Germany)

We report on measurements of the differential [pi][sup [plus minus]][ital p] cross section at pion energies [ital T][sub [pi]]=32.7, 45.1, and 68.6 MeV. The measurements, covering the angular range 25[degree][le][theta][sub lab][le]123[degree], have been carried out at the Paul-Scherrer-Institute (PSI) in Villigen, Switzerland, employing the magnet spectrometer LEPS. The absolute normalization of the [pi][sup [plus minus]][ital p] cross sections have been achieved by relating them to the electromagnetic cross sections of [mu][sup [plus minus] 12]C scattering. The results are in agreement with those of our preceding measurements at [ital T][sub [pi]]=32.2 and 45.1 MeV insofar as they overlap with the region of the Coulomb nuclear interference investigated there. A comparison with the predictions of the Karlsruhe-Helsinki phase shift analysis KH80, which has formed the basis for the determination of the experimental'' [sigma] term, reveals considerable deviations. These are most pronounced for the [pi][sup +][ital p] cross sections at [ital T][sub [pi]]=32.7 and 45.1 MeV. Single energy partial wave fits result in [ital S]-wave contributions, which are about 1[degree] lower in magnitude then those specified by the KH80 solution. The data at 68.6 MeV are in good agreement with the phase shift analysis.

• OSTI ID: 6404033
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Vol. 51:4; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
HYDROGEN 1 TARGET
PION MINUS REACTIONS
PION PLUS REACTIONS
DIFFERENTIAL CROSS SECTIONS
MEV RANGE 10-100
PARTIAL WAVES
PHASE SHIFT
S WAVES
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
ENERGY RANGE
HADRON REACTIONS
MESON REACTIONS
MEV RANGE
NUCLEAR REACTIONS
PION REACTIONS
TARGETS
662340* - Hadron Interactions- (1992-)
663110 - General & Average Properties of Nuclei & Nuclear Energy Levels- (1992-)
663460 - Meson- & Hyperon-induced Reactions & Scattering- (1992-)