Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2000-12-26
Phys.Rev. C64 (2001) 034002
Physics
Nuclear Physics
Nuclear Experiment
14 pages, LaTex, 6 eps-figures, accepted for publication in Phys.Rev.C
Scientific paper
10.1103/PhysRevC.64.034002
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 laboratory frame 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 energy of 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 are 5.3$\sigma$ and 3.5$\sigma$, respectively. This behavior of the photon energy spectrum 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 the radiative process $pp \to \gamma d^\star_1$ followed by its electromagnetic decay via the $d^\star_1 \to pp \gamma$ mode. The experimental spectrum is compared with those obtained by means of Monte Carlo simulations.
Boreiko V. F.
Budyashov Yu. G.
Gerasimov S. B.
Khomutov N. V.
Khrykin Anatoliy S.
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