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# Possibility to study $\eta$-mesic nuclei and photoproduction of slow $\eta$-mesons at the GRAAL facility

Abstract : A new experiment is proposed with the aim to study eta-mesic nuclei and low-energy interactions of eta with nuclei. Two decay modes of eta produced by a photon beam inside a nucleus will be observed, namely a collisional decay \eta N \to \pi N inside the nucleus and the radiative decay \eta \to \gamma \gamma outside. In addition, a collisional decay of stopped S_{11}(1535) resonance inside the nucleus, S_{11}(1535) N \to N N, will be studied. The experiment can be performed using the tagged photon beam at ESRF with the end-point energy 1000 MeV and the GRAAL detector which includes a high-resolution BGO calorimeter and a large acceptance lead-scintillator time-of-flight wall. Some results of simulation and estimates of yields are given.
Document type :
Reports

http://hal.in2p3.fr/in2p3-00020227
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Submitted on : Tuesday, January 13, 2004 - 2:55:34 PM
Last modification on : Thursday, November 19, 2020 - 12:58:38 PM

### Citation

V.A. Baskov, J.P. Bocquet, V. Kouznetsov, A. Lleres, A.I. l'Vov, et al.. Possibility to study $\eta$-mesic nuclei and photoproduction of slow $\eta$-mesons at the GRAAL facility. 2003, pp.1-20. ⟨in2p3-00020227⟩

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