Pion absorption in {sup 3}He at 37 Mev

Journal Article · Fri Oct 01 04:00:00 EDT 1993 · Bulletin of the American Physical Society

OSTI ID:387272

Hahn, H; Ashery, D; Moinester, M A ^[1]

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1. and others

We studied the {sup 3}He({pi}{sup +},pp)p and {sup 3}He({pi}{sup -},pn)n reactions at 37 MeV at TRIUMF. The outgoing protons were detected with NaI(Tl) detectors and the coincident protons (neutrons) with an array of plastic scintillator. The angular distributions for the absorption of a pion on two nucleons were determined. For the {sup 3}He({pi}{sup +},pp)p reaction, the cross section shape is similar to that of d({pi}{sup +},pp), while the magnitude is about 1.5 times larger (7.9 {+-} 0.7 mb). For the {sup 3}He({pi}{sup -}, pn)n reaction, the differential cross sections (with respect to the detected proton) are asymmetric about 90{degrees} in the {pi}-pp center-of-mass system, with the probability higher for proton emission at backward angles. The magnitude of the cross section is 0.85 {+-} 0.15mb. The present data are at the lowest energy compared to previous pion absorption on {sup 3}He. One expects from recent theoretical studies that low energy absorption is of particular interest for probing short-range nucleon- nucleon correlations. Our cross section results for {pi}{sup +} and {pi}{sup -} are similar to those obtained at higher energies.

• OSTI ID: 387272
• Report Number(s): CONF-931044--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 9 Vol. 38; ISSN 0003-0503; ISSN BAPSA6
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ABSORPTION
ANGULAR DISTRIBUTION
CROSS SECTIONS
HELIUM 3 TARGET
MEV RANGE 10-100
PION REACTIONS