Measurement of the pdpdη cross section in complete kinematics

R. Bilger et al.
Phys. Rev. C 69, 014003 – Published 28 January 2004

Abstract

The pdpdη reaction has been studied in a kinematically complete experiment at five beam energies 927, 961, 996, 1032, and 1096MeV. In contrast to our measurement of the pdHe3η at the same energies, all the c.m. angular distributions are consistent with isotropy. The energy dependence of the total cross section seems to follow a three-body phase space as modified by a proton-deuteron final-state interaction, and such an extrapolation is consistent with other near-threshold data. The distributions of the pd and pη invariant mass at fixed beam energy are both close to those of phase space. However, this is not the case for the dη invariant mass, which shows significant structure in the first few MeV above threshold. This behavior is similar to that observed in the energy variation of the pndη total cross section and is the sign of a large η-deuteron scattering length that has been predicted in many theoretical models.

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  • Received 6 October 2003

DOI:https://doi.org/10.1103/PhysRevC.69.014003

©2004 American Physical Society

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Vol. 69, Iss. 1 — January 2004

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