Superratio and the simple ratios of. pi. sup + and. pi. sup minus elastic scattering on sup 3 H and sup 3 He at 180 MeV to investigate charge symmetry

Journal Article · Fri Jun 01 00:00:00 EDT 1990 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.41.2770· OSTI ID:6940196

Nefkens, B M.K.; Briscoe, W J; Eichon, A D; Fitzgerald, D H; Mokhtari, A; Wightman, J A ^[1]; Sadler, M E ^[2]

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1. Department of Physics, University of California at Los Angeles, Los Angeles, California 90024 (USA)
2. Department of Physics, Abilene Christian University, Abilene, Texas 79699 (USA)

Results are presented for the charge-symmetry superratio {ital R}, simple ratios {ital r}{sub 1} and {ital r}{sub 2}, and the differential cross sections of {pi}{sup +} and {pi}{sup {minus}} elastic scattering on {sup 3}H and {sup 3}He: {ital R}={ital r}{sub 1}{ital r2}, {ital r}{sub 1}={sigma}({theta})({pi}{sup +} {sup 3}H{r arrow}{pi}{sup +} H)/{sigma}({theta})({pi}{sup {minus}} He{r arrow}{pi}{sup {minus}} {sup 3}He), and {ital r}{sub 2}={sigma}({theta})({pi}{sup {minus}} {sup 3}H{r arrow}{pi}{sup {minus}} H)/{sigma}({theta})({pi}{sup +} {sup 3}He {r arrow}{pi}{sup +} {sup 3}He). The measurements were made at {ital T}{sub {pi}}=180 MeV and {theta}{sub {pi}}(lab)=40{degree}--90{degree}; some data were obtained at {ital T}{sub {pi}}=143 MeV also. At all angles, {ital R}{gt}1 and {ital r}{sub 2}{gt}1 indicative of a violation of charge symmetry; however, we also find that {ital r}{sub 1}{congruent}1. Our data are consistent with {ital F}{sub {ital p}}({sup 3}H){congruent}{ital F}{sub {ital n}}({sup 3}He) and {ital F}{sub {ital n}}({sup 3}H){gt}{ital F}{sub {ital p}}({sup 3}He), where {ital F}{sub {ital p}} and {ital F}{sub {ital n}} are the proton and neutron matter form factors. {sigma}({theta})({pi}{sup {plus minus}} {sup 3}H{r arrow}{pi}{sup {plus minus}} H) decreases with increasing magnitude of the four-momentum transfer {ital t} up to {theta}{sub c.m.}{congruent}70{degree}; the {ital t} dependence of the {ital F} 's is comparable to that of the electromagnetic form factors. {sigma}({theta})({pi}{sup {minus}} H{r arrow}{pi}{sup {minus}3}H) has a non-spin-flip dip at {theta}{sub c.m.}{congruent}78{degree}.

• OSTI ID: 6940196
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 41:6; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651220* -- Nuclear Properties & Reactions
A=1-5
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
CHARGE DISTRIBUTION
CHARGED-PARTICLE REACTIONS
COMPOSITE MODELS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELASTIC SCATTERING
ELECTROMAGNETIC FORM FACTORS
ENERGY RANGE
FIELD THEORIES
FORM FACTORS
HADRON REACTIONS
HELIUM 3 TARGET
ISOSPIN
MASS DIFFERENCE
MATHEMATICAL MODELS
MESON REACTIONS
MEV RANGE
MEV RANGE 100-1000
MOMENTUM TRANSFER
NUCLEAR REACTIONS
PARTICLE MODELS
PARTICLE PROPERTIES
PION MINUS REACTIONS
PION PLUS REACTIONS
PION REACTIONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK MODEL
SCATTERING
SPIN FLIP
SYMMETRY
TARGETS
TRITIUM TARGET