Isospin effects in the exclusive dp -> 3HeÏ+Ï- reaction
arXiv:1404.2066 · doi:10.1140/epja/i2014-14102-2
Abstract
The differential cross section for the exclusive dp -> 3HeÏ+Ï- reaction has been measured with high resolution and large statistics over a large fraction of the backward 3He hemisphere at the excess energy 265 MeV using the COSY-ANKE magnetic spectrometer. Though the well-known ABC enhancement is observed in the Ï+Ï- spectrum, the differences detected between the Ï+3He and Ï-3He invariant-mass distributions show that there must be some isospin-one ÏÏ production even at relatively low excess energies. The invariant-mass differences are modeled in terms of the sequential decay N*(1440) -> Delta(1232)Ï -> NÏÏ.
7 pages, 6 figures