Komarov, V; Azaryan, T; Chiladze, D; Dymov, S; Dzyuba, A; Hartmann, M; Kacharava, A; ... Wilkin, C; + view all Komarov, V; Azaryan, T; Chiladze, D; Dymov, S; Dzyuba, A; Hartmann, M; Kacharava, A; Keshelashvili, I; Khoukaz, A; Kulikov, A; Kurbatov, V; Macharashvili, G; Merzliakov, S; Mikirtychiants, S; Papenbrock, M; Nekipelov, M; Rathmann, F; Serdyuk, V; Stroher, H; Tsirkov, D; Uzikov, Y; Wilkin, C; - view fewer (2008) Observation of inverse diproton photodisintegration at intermediate energies. PHYS REV LETT , 101 (10) , Article 102501. 10.1103/PhysRevLett.101.102501.

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Abstract

The fundamental reaction pp ->{pp}(s)gamma, where {pp}(s) is a proton pair with low excitation energy, has been observed with the ANKE spectrometer at COSY-Julich for proton beam energies of T-p=0.353, 0.500, and 0.550 GeV. This is equivalent to photodisintegration of a free S-1(0) diproton for photon energies E-gamma approximate to T-p/2. The differential cross sections measured for c.m. angles 0 degrees <theta(pp)< 20 degrees 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 ->gamma d is on the 10(-3)-10(-2) level. The increase of the pp ->{pp}(s)gamma cross section with T-p might reflect the influence of the Delta(1232) excitation.

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