Coincidence measurement of pion double charge exchange in {sup 4}He

Journal Article · Sun Oct 01 04:00:00 EDT 1995 · Bulletin of the American Physical Society

OSTI ID:255580

Saunders, A; Holcomb, M D; Kinney, E R; Kriss, B J ^[1]

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1. and others

Previous inclusive measurements suggest that pion double charge exchange in {sup 3}He and {sup 4}He in the {Delta} resonance region is dominated by a sequential single charge exchange mechanism involving quasi-free nucleons. In the present experiment, we observed protons over a wide range of angles in coincidence with the outgoing pion in the reaction {pi}{sup +} + {sup 4}He {r_arrow} {pi}{sup -} + 4p at T{sub {pi}+} = 240 MeV. The outgoing pion was detected at 0{sub {pi}-} = 32 {degrees}. More than 50 thousand pion and proton coincidence events were collected, as well as single arm pion-only data, to connect with previous measurements. Enough coincidence were collected to provide better than 10% statistics in each energy and angle bin. Preliminary energy and angle distributions of the coincident protons will be presented.

• OSTI ID: 255580
• Report Number(s): CONF-9510116--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 10 Vol. 40; ISSN BAPSA6; ISSN 0003-0503
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CHARGE-EXCHANGE REACTIONS
COINCIDENCE METHODS
DELTA BARYONS
HELIUM 4 TARGET
PION PLUS REACTIONS