Investigation of nuclear charge symmetry by pion elastic scattering from {sup 3}H and {sup 3}He

Journal Article · Sun Dec 01 04:00:00 EST 1996 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.54.2823· OSTI ID:397678

Dhuga, K S; Berman, B L; Briscoe, W J; Caress, R W; Matthews, S K ^[1]; Barlow, D B; Nefkens, B M; Pillai, C; Price, J W ^[2]; Greene, S J ^[3]; Slaus, I; Supek, I ^[4]

---

1. Center for Nuclear Studies, Department of Physics, The George Washington University, Washington, D.C. 20052 (United States)
2. Department of Physics, University of California at Los Angeles, California 90024 (United States)
3. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
4. Department of Physics, Institute Rudjer Boskovic, Zagreb (Croatia)

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.}

• DOE Contract Number: FG05-86ER40270; FG05-86ER40285
• OSTI ID: 397678
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 6 Vol. 54; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
AMPLITUDES
C INVARIANCE
DIFFERENTIAL CROSS SECTIONS
ELASTIC SCATTERING
HELIUM 3 TARGET
MEV RANGE 100-1000
PION REACTIONS
SPIN FLIP
TRITIUM TARGET