Neutral and charged two-pion production in p + d --> He-3 + 2 pi reactions
has been studied at CELSIUS at a proton beam energy of 477 MeV. The total c
ross section for double pion production is 0.22 +/- 0.03 mu b. The ratio of
the cross sections for the production of charged pion pairs with isospin T
= 1 and T = 0 was determined to be sigma(pi(+) pi(-);T = 1)/sigma(pi(+) pi
(-);T = 0) = 1.4 +/- 0.4. (C) 2000 Elsevier Science B.V. All rights reserve
d.