2008/06/03 by V. Komarov, T. Azaryan, D. Chiladze +21
Physics and Astronomy · #Nuclear physics research studies #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-ex
paper · pdf · doi:10.1103/physrevlett.101.102501
published as Phys.Rev.Lett.101:102501,2008 · 4 pages + 4 figures
arxiv created 2008/06/03 · openalex publication_date 2008/09/03 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
The fundamental reaction pp\ensuremath→pps\ensuremathγ, where pps is a proton pair with low excitation energy, has been observed with the ANKE spectrometer at COSY-J"ulich for proton beam energies of Tp=0.353, 0.500, and 0.550 GeV. This is equivalent to photodisintegration of a free 1S0 diproton for photon energies E_\ensuremathγ\ensuremath≈Tp/2. The differential cross sections measured for c.m. angles 0\ifmmode^∘\else\textdegree\fi<\ensuremathθpp<20\ifmmode^∘\else\textdegree\fi exhibit a steep increase with angle that is compatible with E1 and E2 multipole contributions. The ratio of the measured cross sections to those of np\ensuremath→\ensuremathγd is on the 10^\ensuremath-3--10^\ensuremath-2 level. The increase of the pp\ensuremath→pps\ensuremathγ cross section with Tp might reflect the influence of the \ensuremathΔ(1232) excitation.