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Author Dhuga, K. S. ♦ Berman, B. L. ♦ Briscoe, W. J. ♦ Caress, R. W. ♦ Matthews, S. K. ♦ Barlow, D. B. ♦ Nefkens, B. M. ♦ Pillai, C. ♦ Price, J. W. ♦ Greene, S. J. ♦ Slaus, I. ♦ Supek, I.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ TRITIUM TARGET ♦ PION REACTIONS ♦ HELIUM 3 TARGET ♦ C INVARIANCE ♦ ELASTIC SCATTERING ♦ DIFFERENTIAL CROSS SECTIONS ♦ SPIN FLIP ♦ AMPLITUDES ♦ MEV RANGE 100-1000
Abstract We have measured differential cross sections for pion elastic scattering from {sup 3}H and {sup 3}He in the angular region near the minimum in the non-spin-flip amplitude. Data were acquired for incident pion energies of 180, 220, 256, and 295 MeV. Nuclear charge symmetry is investigated with the aid of several charge-symmetric ratios formed from combinations of measured cross sections. A particularly intriguing result is obtained from the superratio {ital R}, which is defined as {ital R}={ital d}{sigma}({pi}{sup +3}H){ital d}{sigma}({pi}{sup {minus}3}H)/{ital d}{sigma}({pi}{sup +3}He){ital d}{sigma}({pi}{sup {minus}3}He). {ital R} is found to be {ital greater} than unity at 180 MeV and significantly {ital smaller} than unity at 256 MeV, with the transition occurring at around 210 MeV. The charge-symmetry prediction for this ratio (after allowance for the Coulomb force) is one, and is independent of energy and angle. {copyright} {ital 1996 The American Physical Society.}
ISSN 05562813
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-12-01
Publisher Place United States
Journal Physical Review, C
Volume Number 54
Issue Number 6


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