Hard bremsstrahlung in the pp -> pp gamma reaction
arXiv:0812.4250 · doi:10.1016/j.physletb.2009.01.069 10.1016/j.physletb.2009.08.037
Abstract
The pp -> pp gamma reaction has been measured at a beam energy of 310 MeV by detecting both final protons in the PROMICE-WASA facility and identifying a missing-mass peak. For those events where the pp excitation is less than 3 MeV, the final diproton is almost purely in the 1S0 state and, under these conditions, there is complete coverage in the photon c.m. angle theta_gamma. The linear behaviour observed in cos^2(theta_gamma) shows that there is almost no influence of an E2 multipole at this energy, though the E1 and M2 must be rather similar in size.
An error in Eq.(1) is corrected. The conclusions of the paper are not changed in any significant way. Phys.Lett.B 673 (2009) 5 + erratum to appear