Observation of Inverse Diproton Photodisintegration at Intermediate Energies

Journal Article · Fri Sep 05 04:00:00 EDT 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.101.102501· OSTI ID:21134192

Komarov, V; Azaryan, T; Kulikov, A; Kurbatov, V; Tsirkov, D; Uzikov, Yu ^[1]; Chiladze, D; Keshelashvili, I ^[2]; Dymov, S ^[1]; Dzyuba, A ^[3]; Hartmann, M; Kacharava, A; Rathmann, F; Stroeher, H ^[2]; Khoukaz, A; Papenbrock, M ^[4]; Macharashvili, G ^[1]; Merzliakov, S; Serdyuk, V ^[1]; Mikirtychiants, S ^[2]

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1. Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, 141980 Dubna (Russian Federation)
2. Institut fuer Kernphysik, Forschungszentrum Juelich, 52425 Juelich (Germany)
3. High Energy Physics Department, Petersburg Nuclear Physics Institute, 188350 Gatchina (Russian Federation)
4. Institut fuer Kernphysik, Universitaet Muenster, 48149 Muenster (Germany)

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

• OSTI ID: 21134192
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 10 Vol. 101; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COSY STORAGE RING
DELTA-1232 BARYONS
DIFFERENTIAL CROSS SECTIONS
EXCITATION
PHOTONS
PHOTONUCLEAR REACTIONS
PROTON BEAMS
PROTONS