Kinematically complete measurement of pp{r_arrow}pn{pi}{sup +} near threshold

Journal Article · Tue Jul 01 04:00:00 EDT 1997 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.56.20· OSTI ID:531907

Hardie, J G; Dytman, S A; Daehnick, W W; Brooks, W K; Flammang, R W ^[1]; Bland, L C; Jacobs, W W; Pancella, P V; Rinckel, T ^[2]; Brown, J D; Jacobsen, E ^[3]

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1. Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (United States)
2. Indiana University Cyclotron Facility, Bloomington, Indiana 47408 (United States)
3. Physics Department, Princeton University, Princeton, New Jersey 08540 (United States)

Cross sections for pp{r_arrow}pn{pi}{sup +} have been measured at incident proton energies of 294.3, 299.3, 306.3, 314.1, and 319.2 MeV (0.11{lt}{eta}{lt}0.42) to investigate hadronic {pi}{sup +} production near threshold. Pion angular distributions are presented for 294.3, 299.3, and 319.2 MeV. At 294.3 and 299.3 MeV they are consistent with isotropy, indicating s-wave dominance for the angular momentum of the {pi}{sup +}pn system. The shapes of the pn, n{pi}{sup +}, and p{pi}{sup +} invariant mass distributions provide further evidence for dominance of s-wave mechanisms close to threshold. At 319.2 MeV significant anisotropy indicates contributions from higher partial waves. The total cross sections show an energy dependence consistent with an early partial conservation of axial current based calculation and with a recent calculation that considers only s-wave contributions. Tentative values for the strongest contributing partial wave amplitudes are presented. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 531907
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 1 Vol. 56; ISSN PRVCAN; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
CROSS SECTIONS
ISOTROPY
MASS DISTRIBUTION
MEV RANGE 100-1000
NEUTRONS
PARTICLE PRODUCTION
PIONS PLUS
PROTON-PROTON INTERACTIONS
PROTONS