Charge-symmetry violation in neutron-proton elastic scattering at E sub n =183 MeV

Journal Article · Mon Mar 18 04:00:00 EST 1991 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.66.1410· OSTI ID:5753581

Knutson, L D; Vigdor, S E; Jacobs, W W; Sowinski, J; Jolivette, P L; Wissink, S W; Bloch, C; Whiddon, C; Byrd, R C ^[1]

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1. University of Wisconsin, Madison, Wisconsin 53706 (US) Indiana University Cyclotron Facility, Bloomington, Indiana 47408 Hope College, Holland, Michigan 49423 Los Alamos Scientific Laboratory, Los Alamos, New Mexico 87545

Measurements of the spin dependence of {ital n}-{ital p} elastic scatteing at {ital E}{sub {ital n}}=183 MeV have been carried out with polarized neutrons and polarized protons. If charge symmetry holds, the two analyzing powers {ital A}{sub {ital n}} and {ital A}{sub {ital p}} must be equal. The measured value of {Delta}{ital A}=={ital A}{sub {ital n}}{minus}{ital A}{sub {ital p}}, averaged over the angular range 82.2{degree}{le}{theta}{sub c.m.}{le}116.1{degree}, is (33.1{plus minus}5.9{plus minus}4.3){times}10{sup {minus}4}. This result represents clear evidence of charge-symmetry violation in the strong interaction. The measurement agrees well with predictions from meson-exchange theory when these include the isospin mixing of the {rho}{sup 0} and {omega}{sup 0} mesons.

• OSTI ID: 5753581
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 66:11; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANALYZING POWER
ANGULAR MOMENTUM
BARYON-BARYON INTERACTIONS
BOSONS
CONSERVATION LAWS
DATA
ELASTIC SCATTERING
ELECTRIC CHARGES
ELEMENTARY PARTICLES
ENERGY RANGE
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HADRON-HADRON INTERACTIONS
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INFORMATION
INTERACTIONS
ISOSPIN
MESONS
MEV RANGE
MEV RANGE 100-1000
NUCLEON-NUCLEON INTERACTIONS
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PARAMETRIC ANALYSIS
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
POLARIZATION
PROTON-NEUTRON INTERACTIONS
PROTON-NUCLEON INTERACTIONS
SCATTERING
SPIN
SYMMETRY