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

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.}

Authors:
; ; ; ;  [1]; ; ; ;  [2];  [3]; ;  [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)
Publication Date:
OSTI Identifier:
397678
DOE Contract Number:  
FG05-86ER40270; FG05-86ER40285
Resource Type:
Journal Article
Journal Name:
Physical Review, C
Additional Journal Information:
Journal Volume: 54; Journal Issue: 6; Other Information: PBD: Dec 1996
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; TRITIUM TARGET; PION REACTIONS; HELIUM 3 TARGET; C INVARIANCE; ELASTIC SCATTERING; DIFFERENTIAL CROSS SECTIONS; SPIN FLIP; AMPLITUDES; MEV RANGE 100-1000

Citation Formats

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, and Supek, I. Investigation of nuclear charge symmetry by pion elastic scattering from {sup 3}H and {sup 3}He. United States: N. p., 1996. Web. doi:10.1103/PhysRevC.54.2823.
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. Investigation of nuclear charge symmetry by pion elastic scattering from {sup 3}H and {sup 3}He. United States. doi:10.1103/PhysRevC.54.2823.
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, and Supek, I. Sun . "Investigation of nuclear charge symmetry by pion elastic scattering from {sup 3}H and {sup 3}He". United States. doi:10.1103/PhysRevC.54.2823.
@article{osti_397678,
title = {Investigation of nuclear charge symmetry by pion elastic scattering from {sup 3}H and {sup 3}He},
author = {Dhuga, K S and Berman, B L and Briscoe, W J and Caress, R W and Matthews, S K and Barlow, D B and Nefkens, B M and Pillai, C and Price, J W and Greene, S J and Slaus, I and Supek, I},
abstractNote = {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.}},
doi = {10.1103/PhysRevC.54.2823},
journal = {Physical Review, C},
number = 6,
volume = 54,
place = {United States},
year = {1996},
month = {12}
}