期刊
NUCLEAR PHYSICS A
卷 712, 期 1-2, 页码 75-94出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0375-9474(02)01187-9
关键词
H-1(p, p pi(+)pi(-) ), (p, p2 pi(0)), (p, p pi(0)pi(+) ), E=650-775 MeV; measured sigma, sigma(theta); deduced reaction mechanism features; comparison with model predictions
Two-pion production reactions in proton-proton collisions have been studied using the PROMICE/ WASA detector and an internal cluster gas-jet target at the CELSIUS storage ring in Uppsala. The total cross sections for the pp --> pppi(+)pi(-), pp --> pppi(0)pi(0) and the pp --> pnpi(0)pi(+) reactions are presented at beam energies ranging from 650 to 775 MeV. An isospin analysis of the amplitudes involved in these three reactions indicates that the excitation of the N*(1440) followed by direct two pion emission can be the most important amplitude when allowed. However, large contributions from other production mechanisms must also be prevalent to explain the large pp --> pnpi(0)pi(+) cross section. The data are compared to an extensive model including non-resonant as well as resonant production via N* and Delta excitation.
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