Measurement of np r arrow d. pi. sup 0 cross sections very near threshold

• Published in: Physical review letters 1990-01, Vol.64:2
• Main Authors: Hutcheon, D.A., Korkmaz, E., Moss, G.A., Abegg, R., Davison, N.E., Edwards, G.W.R., Greeniaus, L.G., Mack, D., Miller, C.A., Olsen, W.C., van Heerden, I.J., Yanlin, Y.
• Format: Article
• Language: English
• Subjects: 645102 - High Energy Physics- Particle Interactions & Properties-Experimental- Weak Interactions & Properties; 651220 - Nuclear Properties & Reactions, A=1-5, Experimental; BARYON-BARYON INTERACTIONS; BARYONS; BASIC INTERACTIONS; BOSONS; CROSS SECTIONS; DATA; DATA ANALYSIS; DELTA BARYONS; DELTA-1232 BARYONS; DEUTERIUM; DIFFERENTIAL CROSS SECTIONS; ELECTROMAGNETIC INTERACTIONS; ELEMENTARY PARTICLES; ENERGY RANGE; EXPERIMENTAL DATA; FERMIONS; HADRON-HADRON INTERACTIONS; HADRONS; HYDROGEN ISOTOPES; INFORMATION; INTERACTIONS; ISOTOPES; LIGHT NUCLEI; MEASURING INSTRUMENTS; MESON-BARYON INTERACTIONS; MESONS; MEV RANGE; MEV RANGE 100-1000; N BARYONS; NUCLEAR PHYSICS AND RADIATION PHYSICS; NUCLEI; NUCLEON-NUCLEON INTERACTIONS; NUMERICAL DATA; ODD-ODD NUCLEI; P WAVES; PARTIAL WAVES; PARTICLE IDENTIFICATION; PARTICLE INTERACTIONS; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; PION-DEUTERON INTERACTIONS; PIONS; PIONS NEUTRAL; PROTON-NEUTRON INTERACTIONS; PROTON-NUCLEON INTERACTIONS; PSEUDOSCALAR MESONS; S WAVES; SPECTROMETERS; STABLE ISOTOPES; TOTAL CROSS SECTIONS
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.64.176

We have measured {ital np}{r arrow}{ital d}{pi}{sup 0} cross sections at eleven beam energies within 16 MeV of threshold. Total cross sections are only 0.67{plus minus}0.10 of the value which has been generally accepted for {ital s}-wave pion production strength near threshold. The differential cross sections are anisotropic at only 1 MeV (c.m.) above threshold. Our results are compared to {pi}{sup +}d{r arrow}pp data and to predictions of two models.