Observation of inverse diproton photodisintegration at intermediate energies

Details Observation of inverse diproton photodisintegration at intermediate energies Observation of inverse diproton photodisintegration at intermediate energies

2008-06-03

arxiv.org/abs/0806.0648v1

Phys.Rev.Lett.101:102501,2008

Physics

Nuclear Physics

Nuclear Experiment

4 pages + 4 figures

Scientific paper

10.1103/PhysRevLett.101.102501

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.

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