Study of decay and absorption of the Δ resonance in nuclei with a 4π detector

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Abstract

We present data on the decay of the Δ resonance excited in 1H, 2H and 12C by the (3He, t) reaction at 2 GeV incident energy. In the energy transfer spectra, the same position and width of the Δ resonance are observed on the three targets when π+ and one proton are detected in coincidence with the triton. On the 12C target, the Δ peak associated with the detection of two protons is shifted by 100 MeV towards lower excitation energy.

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This work was supported in part by the Danish and Swedish National Science Councils.

We are grateful to the staff of Saturne for their assistance. We wish to thank B. Lucas and A. Le Merdy for their help in the initial stage of the experiment. We acknowledge the efficient technical assistance of R. Skowron and R. Margaria.

1

On leave from Soltan Institute for Nuclear Studies, PL-00681 Warsaw, Poland.

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