Indication of pionic-atom anomalies in pion-nucleus elastic scattering

Journal Article · Mon Jun 01 04:00:00 EDT 1987 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.35.2258· OSTI ID:6600905

Wright, D H; Blecher, M; Masutani, K; Seki, R; Boudrie, R L; Burman, R L; Leitch, M J; Alsolami, M; Blanpied, G; Escalante, J A; others, and

Elastic cross sections for the scattering of positive and negative pions from /sup 58/Ni were measured at 30 MeV incident pion energy. Statistical errors of +- 3% and normalization errors of +- 6% were achieved. These data appear to confirm the theoretical construct that the physics which explains anomalously small shifts and widths in pionic atoms would be manifested in low energy pion-nucleus elastic scattering. The data show good agreement with the cross sections calculated assuming s and p partial waves are anomalous. Here anomalous refers to partial waves that are calculated from an optical potential which reproduces anomalously small level shifts and widths in pionic atoms. Conventional optical potentials do not agree as well with both the ..pi../sup +/ and ..pi../sup -/ data. Various conventional possibilities such as a larger neutron radius than proton radius in the nuclear density were tried, but these did not result in good agreement with the data.

• Research Organization: Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
• OSTI ID: 6600905
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 35:6; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

640303 -- Atomic
Molecular & Chemical Physics-- Positronium
Muonium
& Muonic & Mesic Atoms & Molecules
651520* -- Nuclear Properties & Reactions
A=39-58
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ACCELERATORS
ATOMS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
ELASTIC SCATTERING
ENERGY RANGE
HADRON REACTIONS
HADRONIC ATOMS
LAMPF LINAC
LEVEL WIDTHS
LINEAR ACCELERATORS
MEASURING INSTRUMENTS
MESIC ATOMS
MESON FACTORIES
MESON REACTIONS
MEV RANGE
MEV RANGE 10-100
NICKEL 58 TARGET
NUCLEAR REACTIONS
OPTICAL MODELS
P WAVES
PARTIAL WAVES
PHASE SHIFT
PION MINUS REACTIONS
PION PLUS REACTIONS
PION REACTIONS
PIONIC ATOMS
RENORMALIZATION
S WAVES
SCATTERING
SPECTRAL SHIFT
SPECTROMETERS
TARGETS