Observation of inverse diproton photodisintegration at intermediate energies

V. Komarov; T. Azaryan; D. Chiladze; S. Dymov; M. Hartmann; A. Kacharava; I. Keshelashvili; A. Khoukaz; A. Kulikov; V. Kurbatov; G. Macharashvili; S. Merzliakov; S. Mikirtychiants; M. Papenbrock; M. Nekipelov; F. Rathmann; V. Serdyuk; H. Stroeher; D. Tsirkov; Yu. Uzikov; C. Wilkin

doi:10.1103/physrevlett.101.102501

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arXiv · 0806.0648

Observation of inverse diproton photodisintegration at intermediate energies

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Abstract

The reaction pp->{pp}_sγ, where {pp}_s is a proton pair with an excitation energy E_{pp}<3 MeV, has been observed with the ANKE spectrometer at COSY-Juelich for proton beam energies of T_p=0.353, 0.500, and 0.550 GeV. This is equivalent to photodisintegration of a free 1S_0 diproton for photon energies Eγ~ T_p/2. The differential cross sections measured for c.m. angles 0 deg.<θ_{pp}<20 deg. 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->dγis on the 10^{-3}-10^{-2} level. The increase of the pp->{pp}_sγcross section with T_p might reflect the influence of the Delta(1232) excitation.

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V. Komarov, T. Azaryan, D. Chiladze, S. Dymov, M. Hartmann, A. Kacharava, I. Keshelashvili, A. Khoukaz, A. Kulikov, V. Kurbatov, G. Macharashvili, S. Merzliakov, S. Mikirtychiants, M. Papenbrock, M. Nekipelov, F. Rathmann, V. Serdyuk, H. Stroeher, D. Tsirkov, Yu. Uzikov, C. Wilkin. 2008-06-03. Observation of inverse diproton photodisintegration at intermediate energies. https://doi.org/10.1103/physrevlett.101.102501

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