中能反双质子光致蜕变的观测
Observation of inverse diproton photodisintegration at intermediate energies
摘要：
用COSY-Juelich的ANKE谱仪，在T_p=0.353，0.500和0.550 GeV的质子束能量下，观测到了pp → {pp}_sγ反应，其中{pp}_s是激发能E_{pp} <3 MeV的质子对。这等价于光子能量为Eγ~ Tp/2的自由1S_0双质子的光衰变。测量的微分截面为c.m.角度0度<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->dγ在10^{-3}-10 ^{-2}水平。pp->{pp}_sγ截面随T_p的增加可能反映了Delta（1232）激发的影响。
英文摘要：
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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