A preliminary result of the second np charge symmetry breaking experiment at TRIUMF

Journal Article · Mon Jul 10 04:00:00 EDT 1995 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.48541· OSTI ID:165519

Zhao, J ^[1]; Abegg, R ^[2]; Berdoz, A R; Birchall, J; Campbell, J R ^[1]; Davis, C A; Delheij, P P.J. ^[2]; Gan, L ^[1]; Green, P W; Greeniaus, L G ^[3]; Healey, D C; Helmer, R ^[2]; Kolb, N; Korkmaz, E a ^[3]; Lee, L ^[1]; Levy, C D.P. ^[2]; Li, J ^[3]; Miller, C A ^[2]; Opper, A K ^[3]; Page, S A ^[1] ; Postma, H ^[2]; Ramsay, W D ^[1]; Soukup, J; Stinson, G M ^[3]; van Oers, W T.H. ^[1]; Zelenski, A N ^[2]

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1. University of Manitoba, Winnipeg, Manitoba, R3T 2N2 (Canada)
2. TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3 (Canada)
3. University of Alberta, Edmonton, Alberta, T6G 2N5 (Canada)

TRIUMF experiment 369, a measurement of charge symmetry breaking in np elastic scattering at 350 MeV, has completed data taking. Scattering asymmetries were measured with a polarized (unpolarized) neutron beam incident on an unpolarized (polarized) frozen spin target. Coincident scattered neutrons and recoil protons were detected by a mirror symmetric detection system in the center of mass angle range from 50{degree}--90{degree}. A preliminary result for the difference of the zero-crossing angles, where analyzing powers cross zero, is {Delta}{theta}{sub cm}=0.48{degree}{plus_minus}0.08{degree}({ital stat}.){plus_minus}0.08{degree}({ital syst}.) based on fits over the angle range 55.8{degree}{le}{theta}{sub cm}{le}85.4{degree}. The difference of the analyzing powers {Delta}{ital A}{equivalent_to}{ital A}{sub {ital n}}{minus}{ital A}{sub {ital p}}, where the subscripts denote polarized nucleons, was deduced with {ital dA}/{ital d}{theta}{sub cm}={minus}1.47{times}10{sup {minus}2} deg{sup {minus}1} from phase shift analyses to be [71{plus_minus}12({ital stat}.){plus_minus}12({ital syst}.)]{times}10{sup {minus}4}. It is expected that when all data are analyzed a statistical accuracy of about 7{times}10{sup {minus}4} in {Delta}{ital A} will be achieved. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.

• Sponsoring Organization: USDOE
• OSTI ID: 165519
• Report Number(s): CONF-940514--
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 338; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
C INVARIANCE
ELASTIC SCATTERING
MEV RANGE 100-1000
POLARIZATION-ASYMMETRY RATIO
POLARIZED BEAMS
PROTON-NEUTRON INTERACTIONS