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The energy spectrum for high energy $\gamma$-rays ($E_\gamma \geq 10$ MeV)from the process $pp \to \gamma \gamma X$ emitted at $90^0$ in the laboratoryframe has been measured at an energy below the pion production threshold,namely, at 216 MeV. The resulting photon energy spectrum extracted from$\gamma-\gamma$ coincidence events consists of a narrow peak at a photon energyof about 24 MeV and a relatively broad peak in the energy range of (50 - 70)MeV. The statistical significances for the narrow and broad peaks are5.3$\sigma$ and 3.5$\sigma$, respectively. This behavior of the photon energyspectrum is interpreted as a signature of the exotic dibaryon resonance$d^\star_1$ with a mass of about 1956 MeV which is assumed to be formed in theradiative process $pp \to \gamma d^\star_1$ followed by its electromagneticdecay via the $d^\star_1 \to pp \gamma$ mode. The experimental spectrum iscompared with those obtained by means of Monte Carlo simulations.Comment: 14 pages, LaTex, 6 eps-figures, accepted for publication in  Phys.Rev.

physical review. c. nuclear physics/physical review. c, nuclear physics

Search for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>NN</mml:mi></mml:math>-decoupled dibaryons using the process<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>p</mml:mi></mml:mrow><mml:mrow><mml:mo>→</mml:mo></mml:mrow></mml:mover></mml:mrow></mml:mrow><mml:mi>γ</mml:mi><mml:mi>γ</mml:mi><mml:mi>X</mml:mi></mml:math>below the pion production threshold

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