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, Ströher H, Tsirkov D, Uzikov Y, Wilkin C. Observation of inverse diproton photodisintegration at intermediate energies.
Phys Rev Lett 2008;
101:102501. [PMID:
18851211 DOI:
10.1103/physrevlett.101.102501]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2008] [Revised: 07/23/2008] [Indexed: 05/26/2023]
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-Jülich for proton beam energies of T_{p}=0.353, 0.500, and 0.550 GeV. This is equivalent to photodisintegration of a free 1S0 diproton for photon energies E_{gamma} approximately 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-->gammad 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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