Observation of double radiative capture on pionic hydrogen

Details Observation of double radiative capture on pionic hydrogen Observation of double radiative capture on pionic hydrogen

2002-04-25

arxiv.org/abs/nucl-ex/0204013v4

Phys.Rev.Lett. 89 (2002) 252501

Physics

Nuclear Physics

Nuclear Experiment

4 Pages, 4 Figures. accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.89.252501

We report the first observation of double radiative capture on pionic hydrogen. The experiment was conducted at the TRIUMF cyclotron using the RMC spectrometer, and detected $\gamma$--ray coincidences following $\pi^-$ stops in liquid hydrogen. We found the branching ratio for double radiative capture to be $(3.05 \pm 0.27(stat.) \pm 0.31(syst.)) \times 10^{-5}$. The measured branching ratio and angle-energy distributions support the theoretical prediction of a dominant contribution from the $\pi \pi \to \gamma \gamma$ annihilation mechanism.

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