/ Experiment-Nucl arXiv:0806.0648

Observation of inverse diproton photodisintegration at intermediate energies

Komarov, V. (Dubna, JINR) ; Azaryan, T. (Dubna, JINR) ; Chiladze, D. (Tbilisi State U.) ; Dymov, S. (Erlangen - Nuremberg U.) ; Dzyuba, A. (St. Petersburg, INP) ; Hartmann, M. (Julich, Forschungszentrum) ; Kacharava, A. (Julich, Forschungszentrum) ; Keshelashvili, I. (Tbilisi State U.) ; Khoukaz, A. (Munster U.) ; Kulikov, A. (Dubna, JINR) ; Kurbatov, V. (Dubna, JINR) ; Macharashvili, G. (Tbilisi State U.) ; Merzliakov, S. (Julich, Forschungszentrum) ; Mikirtychiants, S. (St. Petersburg, INP) ; Papenbrock, M. (Munster U.) ; Nekipelov, M. (St. Petersburg, INP) ; Rathmann, F. (Julich, Forschungszentrum) ; Serdyuk, V. (Julich, Forschungszentrum) ; Stroher, H. (Julich, Forschungszentrum) ; Tsirkov, D. (Dubna, JINR) ; Uzikov, Yu. (Dubna, JINR) ; Wilkin, C. (University Coll. London)

Published in: Phys.Rev.Lett.
Year: 2008
Vol.: 101
Page No: 102501
Pages: 4

Abstract: The reaction pp->{pp}_s\gamma, 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 E\gamma ~ T_p/2. The differential cross sections measured for c.m. angles 0 deg.<\theta_{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->d\gamma 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.

Web-Page: http://durpdg.dur.ac.uk/cgi-hepdata/hepreac/7775911; http://inspirebeta.net/record/787271/files/figure1.png; http://inspirebeta.net/record/787271/files/figure2.png; http://inspirebeta.net/record/787271/files/figure3.png; http://inspirebeta.net/record/787271/files/figure4.png

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