Search for $\eta$-mesic nuclei in recoil-free transfer reaction

Budzanowski, A.; et, al.; Chatterjee, A.; Hawranek, P.

doi:10.1103/PhysRevC.79.012201

Journal Article

PreJuSER-8504

Search for $\eta$-mesic nuclei in recoil-free transfer reaction

Budzanowski, A. ; Chatterjee, A. ; Hawranek, P. ; et, a.FZJ*

2009
Inst. Woodbury, NY

Physical review / C 79(1), 012201 (2009) [10.1103/PhysRevC.79.012201]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10434 doi:10.1103/PhysRevC.79.012201

Abstract: We have studied the reaction p + Al-27 -> He-3 + p + pi(-) + X at recoil-free kinematics. An eta meson possibly produced in this reaction would be thus almost at rest in the laboratory system and could therefore be bound with high probability, if nuclear eta states exist. The decay of such a state through the N*(1535) resonance would lead to a proton-pi(-) pair emitted in opposite directions. For these conditions we find some indication of such a bound state. An upper limit of approximate to 0.5 nb is found.

Keyword(s): p nucleus: nuclear reaction ; aluminum ; pi-: hadroproduction ; bound state: (nucleus eta) ; N(1535) ; magnetic spectrometer ; Juelich COSY PS ; p aluminum --> helium p pi- anything ; 1.745 GeV/c

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Note: Discussions with B. Kamys and C. Wilkin are gratefully acknowledged. We appreciate the support received from the European community research infrastructure activity under the FP6 "Structuring the European Research Area" program under Contract No. RII3-CT-2004-506078, from the Indo-German bilateral agreement, from the Research Center Julich (FFE), and from GAS Slovakia (1/4010/07).; 3 figures

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