$π\to ππ$ results in nuclei

Details $π\to ππ$ results in nuclei $π\to ππ$ results in nuclei

2001-09-11

arxiv.org/abs/nucl-ex/0109007v1

Phys.Rev. C64 (2001) 067601

Physics

Nuclear Physics

Nuclear Experiment

7 pages, 1 figure, accepted for publication in Phy. Rev. C - Brief Report

Scientific paper

10.1103/PhysRevC.64.067601

The Crystal Ball ($CB$) collaboration at $BNL$ has recently presented results regarding a study of the $\pi^- A \to \pi^0\pi^0 A^\prime$ reaction on $H, D, C, Al$ and $Cu$, using a nearly 4$\pi$ detector. Similar results, but for the $\pi^+ A \to \pi^+\pi^{\pm} A^\prime$ reaction on $^{2}H$, $^{12}C$, $^{40}Ca$, and $^{208}Pb$, have been published earlier by the $CHAOS$ collaboration at $TRIUMF$. In this Brief Report a comparison of the results of the two measurements is made, which shows that the $CHAOS$ and $CB$ data share relevant common features. In particular, the increase in strength as a function of A seen in the near-threshold $\pi^+ \pi^-$ invariant mass spectra reported by the $CHAOS$ group, is also seen in the $\pi^0 \pi^0$ CB data, when the results from the two groups are compared in a way which accounts for the different acceptances of the two experiments.

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